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Ten-Tec RCU-400A USERS MANUAL-7-25A

1. NJ FE 4 1 4 1 PN 74436 PARAGRAPH 4 3 Configuration Switch 06 4 4 Detailed Operating 0 4 4 1 Front Panel nnns 4 4 1 1 Control xo teta ad 4 4 2 Initial Configuration Upon Power 4 4 3 Factory Set 4 4 4 Operation inini RATER EC REN ARIS 4 4 4 1 4 4 4 1 1 4 4 4 1 2 Using the FREQ Button 4 4 4 2 Using the Arrow lt gt 4 4 4 3 Detection 4 4 4 4 4 4 4 5 RF Gain and Squelch Settings 4 4 4 6 AGG af 4 4 4 7 BFO ODBSFabOFL 4 4 4 8 The Menu 4 4 4 9 Setting Up F1 F2 Frequency Scan Mode 4 4 4 10 Scan Mode Operation 4 4 4 11 Setting Up Memory Scan Mode 4 4 4 12 Memory Channel Scan Operation 4 4 4 13 Local and Lock Buttons 4 4 4 14 MIS Soft key Function 5 0 THEORY OF OPERATION 8 5 2 CIRCUIT Descriptions
2. 5 2 1 5 2 2 Ethernet SWIECTE 5 2 3 Serial PMSA CS 5 2 4 Display and Keyboard 5 2 5 Power SUD PIV ra vacscessaedececesssaeaustatecevadsbtotevestsdadeenansuiaendepnsses 5 0 FIRMWARE LOAD AND UPDATE PROCEDURES TAUPO RUC O Ede undi Ld dub 6 2 Required Application 5 6 3 Firmware Load Update TABLE OF CONTENTS cont d PN 74436 RECEIVER CONTROL UNIT INTERFACES MEM NL EET Ethernet LAN Interface 7 2 1 Communications Command Message Terminators for Commands and Queries Query RespornseFolfndlS Control 7 6 1 Command DESEMPUCNS sea ores AUDIO STREAMING Radio Over IP RIP Data MAINTENANCE Factory Service sauducssiteessicewsctowiestaniacatmqeeredeanstacevectaxeneummineenateas Cleaning and ligo aio PM P
3. Chapter 9 provides maintenance information Chapter 10 gives instructions to prepare the RCU for storage or shipment PN 74436 1 1 2 0 GENERAL INFORMATION 2 1 RCU 400A RECIVER CONTROL UNIT PURPOSE AND FUNCTION The TEN TEC RCU 400A Receiver Control Unit RCU provides manual control for the RX 400A HF VHF UHF Receiver The RCU may be co located with a receiver using a side by side RM 400 2 rack mount kit or remotely located to another position convenient to the operator The RCU 400A can control one 1 to seven 7 receivers The unit is designed for fixed site transportable airborne and shipboard applications where the front panel controls may be operated easily with gloved hands The panel layout uses large menu driven pushbutton keys and a multi pot shaft encoder to control receiver functions A blue backlit LCD display presents the selected receiver s frequency detection mode IF bandwidth signal level gain AGC mode step size threshold and F1 F2 memory channel scan modes Built In Test BIT screen is provided to report receiver status Control interface from the RCU to the RX 400A receiver or receivers is via Ethernet using an internal smart switch A digital audio stream from the receiver is also passed over the Ethernet connection to the switch For mission downloads from an external host PC or workstation using the MDL Mission Down Load software package the RCU is connected to the LAN using the Ethernet port H
4. Pushbuttons Keys Volume Control External Reference Main Tuning Control Multi pot Line Audio Power Switch 90 260 VAC Power PN 74436 2 6 3 0 PREPARATION FOR USE AND INSTALLATION 3 1 UNPACKING AND INSPECTION Examine the shipping carton for damage before unpacking the unit If the carton is damaged attempt to open it in the presence of the shipping agent If this is not possible then document or photograph the carton damage for a matter of record If undamaged then retain the carton and packing material for future use Remove the packing material from the top of the unit and lift the RCU 400A Receiver Control Unit RCU free of the carton Next remove the clear plastic bag from the unit Inspect the unit for external damage with particular attention to dents or bent sheet metal Also inspect front panel components and rear panel connectors for damage If external damage is evident then remove top and bottom covers of the RCU by removing multiple screws along the cover edges then inspect all the internal assemblies for damage such as cracked circuit cards or broken or loose components DO NOT ATTEMPT TO OPERATE THE EQUIPMENT IF INTERNAL DAMAGE IS NOTED Upon finding any damage contact the shipping agent and contact the TEN TEC factory to arrange for unit repair 3 2 MOUNTING The RCU 400A may be mounted as a single unit or side by side with another 2U half rack piece of equipment in a standard EIA 19 rack enclosure
5. THEORY OF OPERATION 5 1 OVERVIEW The Ten Tec model RCU 400A is a DSP and micro Processor based Receiver Control Unit with a Front panel LCD and full complement of controls to provide manual operation of companion RX 400A HF VHF UHF Receivers The RCU contains a main Logic DSP assembly which is the heart of the unit in terms of determining the development of receiver commands and presenting receiver operating parameters to the front panel display an 8 port Ethernet switch a RS 232 interface an Ethernet interface a LCD display front panel controls assembly and an AC power supply The overall internal functions are shown in FIGURE 5 1 below Main Tuning Multi Pot Ext Ref Front Panel Assy Receiver Data Status and Digital Audio Headphones Audio FIGURE 5 1 RCU 400A BLOCK DIGRAM 5 1 PN 74436 5 2 CIRCUIT DESCRIPTIONS A brief working description of each major functional assembly follows and is intended to provide the user with a basic understanding of the RCU 400A design 5 2 1 Logic DSP Section This assembly forms the core of the RCU 400A as it generates and assembles command words that are used to control the RX 400A receivers It contains a 32 bit micro processor Xilinx PLD and 21364 DSP integrated circuit that interfaces with the front panel assembly Ethernet I O and RS 232 I O The interface with the I O circuits is comprised of command data to from and digital audio streams from RX 400A rec
6. USER MANUAL INSTALLATION AND OPERATION RECEIVER CONTROL UNIT MODEL RCU 400A TEN TEC INC 1185 DOLLY PARTON PARKWAY SEVIERVILLE TN 37862 THIS MANUAL WAS PREPARED IN ACCORDANCE WITH MIL HDBK 1221 157 PRINTING 3 10 PRINTED IN U S A PART NO 74436 RECORD OF CHANGES CHANGE NO DATE TITLE OR DESCRIPTION ENTERED BY 7 28 10 Table of Contents add para 4 4 4 14 J Andem listing 7 28 10 Page 4 19 add para 4 4 4 14 MIS J Andem softkey function 7 28 10 Para 7 6 1 page 7 22 Mission Download J Andem command word description PN 74436 HIGH VOLTAGE Is used in the operation of this equipment DEATH ON CONTACT may result if personnel fail to observe safety precautions Learn the areas containing high voltage within the equipment Be careful not to contact high voltage connections when installing operating or maintaining this equipment Before working inside the equipment turn power OFF and ground points of high potential before touching them PN 74436 PARAGRAPH LIST ILLUSTRATION LIST OF TABLES 1 0 INTRODUCTION 1 1 Purpose Scope 2 0 GENERAL INFORMATION 2 1 RCU 400A Purpose and 2 2 toU T Set 2 3 Environmental 2 42 Mechanical cd Dix des 2 5 Blecri
7. For single unit rack installation please contact TEN TEC to secure the correct rack mount kit For most common mounting arrangements the RCU 400A will be installed side by side with a RX 400A Receiver to fill a 2U rack opening Side by side mounting is accomplished by using the RM 400 2 Rack Mount Kit The RCU 400A has 3 threaded inserts on each side of the chassis to accept 10 32 x 0 50 long screws for use with customer furnished chassis slides The hole pattern is compatible with Jonathan model 375QD or equivalent The rack mount kit contains 4 pieces as listed in Table 3 1 TABLE 3 1 RM 400 2 Rack Mount Kit Contents U Channel Bracket Front Panel Center Bracket Rack Mount Ears R amp L 10 32 Hex Head Attachment Screws 3 1 PN 74436 To use the RM 400 2 rack mount kit first attach the U channel bracket to the inside side of one of the chassis using the rear 2 mounting holes out of the set of 3 with the furnished screws Then attach the front panel bracket to the chassis with the flat side toward the front panel surface Next position the second chassis so the U channel and front panel brackets can be attached to the second chassis Now the 2 units are secured together with about a 2 inch gap between the chassis Next attach the left hand and right hand brackets rack mount ears using the furnished screws The ears are attached using 2 threaded 10 32 inserts at the front of the RCU 400A and RX 400A chassis Refer to Figure
8. Performance Controls encoders amp switches Frequency Rotary encoder weighted knob with Adjustable drag setting TUNING LOCK Pushbutton dedicated key POWGL ad sco Push Left Right toggle ON OFF Audio Gaines ore a Dedicated rotary encoder Dedicated Pushbutton Menu Keys Two rows of 7 14 pushbuttons Receiver Parameters Multi pot encoder tuning knob for RF Gain Detection Mode IF Bandwidth Step Size F1 F2 Squelch BFO AGC Scan Memory Channel Load Recall Up gt Down lt keys Receiver and Menu key Display Readouts Display Panel LCD Blue Backlit 30 second timeout Frequency to 1Hz resolution IF bandwidth in kHz Detection Mode Step Size highlight of frequency digit Signal Strength bar graph F1 start F2 stop Gaze Dwell Dead time FS during scan AGC On Off Fast Med Slow Program Memory Channel Load Recall Skip Interface Receiver Control Ethernet connection between each receiver up to 7 and a numbered port on rear panel Ethernet switch External doses oobis Rear panel Ethernet LAN for Mission Down Load facility from host PC Workstation Firmware Update Via RS 232 connection to lap
9. are 0 99999999 The dwell time feature sets the duration of time the receiver will remain on an active channel An infinite dwell time can also be selected Setting the Dwell Time to 0 activates the INFINATE DWELL which forces the radio to remain on the frequency or memory channel as long as it is active SQUELCH open 7 20 Dead Time T2 Format Set command lt gt Get command 2 2 lt gt Response gt lt gt represents the time in ASCII decimal format Value number of milliseconds Valid ranges are 0 99999999 Dead time refers to the time the radio will remain on a channel after activity has ended The factory default is 8 seconds If the DWELL TIME setting is less than the DEAD TIME setting the radio will resume scanning when the DWELL TIME timer runs out If the DWELL TIME setting exceeds the DEAD TIME setting scanning will resume when the DEAD TIME timer runs out Gaze Time T3 Format Set command T3TTTTTTTT lt cr gt Get command 3 lt gt Response T3TTTTTTTT lt cr gt TTTTTTTT represents the time in ASCII decimal format Value number of milliseconds Valid ranges are 0 99999999 Gaze time is the time the radio will spend waiting for activity on each new channel or frequency The factory setting is 50Ms This time be adjusted to control the rate of scan S Meter Hold Off Time T4 F
10. digitized streamed to the RCU then converted back to an analog format for operator listening 3 9 CHASSIS GROUND A chassis ground connection should be made on the rear panel using 10 32 x inch screw and terminal lug The ground wire should be AWG 16 or larger 3 10 TYPICAL INTERCONNECTIONS RCU 400A To RX 400A Figure 3 3 depicts the typical interconnections required between the RCU 400A Receiver Control Unit and RX 400A HF VHF UHF Receiver s RF Inputs RF Input RX 400A RX 400A RX 400A RECEIVER RECEIVER 2 RECEIVER 7 1 ine Audio Y Tine Headphones Ethernet 2 Ethernet 7 AC Power AC Power Headphones 8 Ethernet LAN Ethernet 1 Line Audio RCU 400A RECEIVER Headphones CONTROL UNIT Power RS 232 FIGURE 3 3 RCU RX Interconnections PN 74436 3 7 4 0 OPERATION The RCU 400A Receiver Control Unit provides manual control of up to seven 7 companion RX 400A HF VHF UHF Receivers This chapter gives step by step instructions for operating all the functions of the RX 400A Receiver 4 1 POWER ON OFF In an installation having a connected to between 1 and 7 receivers each receiver s power is turned ON first by depressing the right side of the toggle switch toward the front panel followed by the RCU power up by depressing the left side of its power switch to the 1 position This sequence is preferred to e
11. hertz entered as10 ASCII decimal format Leading zeros can be omitted Range 100kHz to 3 GHz Example To tune a frequency of 235 67 MHz the value 235670000 will be entered To tune a value of 2 MHz 2000000 can be entered Start End Frequency F2 This command is used to select the start and end frequency range for PPSCAN mode which allows the radio to search for activity in a given frequency range Format Set command F2SSSSSSSSSS lt dot gt EEKEEEEEEE lt cr gt Get command F2 lt cr gt Response F2SSSSSSSSSS lt dot gt EEEEEEEEEE lt cr gt Definitions SSSSSSSSSS Selects the starting frequency in hertz The value entered in 10 ASCII decimal format Leading zeros can be omitted but the lt dot gt character must be transmitted to differentiate between the start and end frequency values Range 100kHz 3 GHz Selects the ending frequency in hertz The value entered in 10 ASCII decimal format Leading zeros can be omitted Range 100kHz 3 GHz 7 12 Start Halt Pause Resume Frequency Scan F3 Format Set command F3X lt cr gt Get command 2 lt gt Response F3X lt cr gt Definitions X lt S gt start programming frequencies for the specified range using command F2 If no range has been specified using command 2 the receiver the valid range will be from 0 3Ghz in 1hz increments if no step size is specified via command F5 If command F5 has been received the recei
12. o aac 4 12 4 13 Scd ET EMU 4 14 Gaze Dwell and 4 15 FI F2 Scan MOGG euin toon sitet tenet den ca utate 4 16 F1 F2 Scan Mode Flow 4 16 Memory Channel Scan Mode 4 18 Memory Channel Scan 4 19 Memory Channel Scan Mode Flow Chart 4 20 RCU 400A Block 11 1 eene 5 1 PN 74436 LIST OF TABLES TITLE PAGE a 2 3 Environmental 2 5 RCU 400A Power Requirements 2 6 RM 400 2 Rack Mount Kit Contents 3 1 RX 400A Audio 3 5 Control Furictlens 4 3 Arrow Key 4 9 Scan Mode eese eene nine 4 13 Memory Channel Scan Mode Set Up 4 17 Baud Rate Switch 5 7 1 Command 7 3 74436 CHAPTER 1 1 0 INTRODUCTION 1 1 PURPOSE SCOPE AN
13. range of the value If a negative value is allowed for the argument a positive or negative sign is always given Multiple responses to a query are valid but are separated by a CR character 7 6 CONTROL PARAMETERS Various receiver parameters can be controlled and or monitored over the RS 232 or Ethernet interface See Table 7 2 below for supported control commands Note All commands are 2 ASCII characters TABLE 7 2 COMMAND PARAMETERS Description _ SetCommand Query Command Not Applicable 2 Not Applicable BITElevi3 4 EPI 21 Channel Attenuation Automatic Gain C5 Control Detection Mode Memory Recall Software Reset Load EEprom D1 Stop Ethernet Audio 0 Start Ethernet E1 Address IP Address Communications Communications 7 3 Table 7 2 Continued Tune Frequency Start End F2 F2 Frequency Range for Frequency Scan F3 F3 Start Halt Pause Re sume Frequency Scan Frequency T 7 Frequency Range P Frequency Range Set Decay Rate Unit Serial Number Ee Version bes uela RR Info s d II Channel Store current Memory Channel Memory Scan p2 P2 Channel Range Start Stop Channel Skip Add Memory Scan Halt Pause Resume Strength SquelhStatus Not Applicabe 25 Time Time Address mode A
14. 0x45 Oxnn ID of the Radio last 4 MAC digits The above octets were arranged so that a third party program that supports RTP audio protocol could already use the packets from the RX 400A Additional header information is included that is specific to the RX 400A Octet 12 15 Sampling Frequency 0x00 Oxnn MSB first e g if sampling frequency is 54081 the value returned would be 0x00 0x00 Oxd3 0x41 Because the RX400 sample rate is related to filter selection this will change when filters are changed 128 octets Audio Data Oxnn The audio data samples are two octets long and there are 64 of them Format is 2 octets per sample MSB first There are two commands to start and stop the RIP process Stop Ethernet RIPing Start Ethernet RIPing 8 1 9 0 MAINTENANCE 9 1 FACTORY SERVICE The RCU 400A Receiver Control Unit is designed to provide reliable service however should non recoverable faults or equipment failure occur it is recommended the unit be returned to TEN TEC Inc for repair The TEN TEC Service Department provides quick turn around for most repairs RMA numbers are not required You may contact TEN TEC to arrange for service at 865 428 0364 Hours are 8 00AM 5 00PM Monday through Friday Or send e mail to service tentec com If known please indicate the nature of the fault or defect Also include return shipping address and any special instructions related to marking or p
15. Control rates and a programmable AGC mode The operator may select Slow Medium Fast or Programmable via the C5 command The three modes are selected as defined Format Set command C5X lt cr gt Get command 5 lt gt Response 5 lt gt Definitions X lt S gt select SLOW mode lt M gt selects MEDIUM mode lt F gt selects FAST mode lt P gt Programmable Mode Default M MEDIUM setting If programmable mode is selected the radio will use the value entered via the G1 G2 and G3 Set Attack Decay Hang Rate command Detection Mode C7 Format Set Command C7M lt cr gt Get Command 7 lt gt Definitions M lt A gt AM lt U gt USB lt L gt LSB lt C gt CWU lt W gt CWL lt F gt FM lt K gt FSK The detection mode command determines how the signal is to be demodulated The Receiver Supports AM USB LSB CWU CWL FM and FSK detection modes Memory Recall C8 Format Set command C8nnn lt cr gt Get command C8nnn lt cr gt where nnn is value between 0 and 999 Definitions This command recalls contents of previously loaded memory channels If memory channel is empty then no action is taken Format Set command C7M lt cr gt Get command 7 lt Response C7M lt cr gt Definitions M lt A gt AM lt U gt USB lt L gt LSB lt C gt CWU lt F gt FM lt W gt CWL lt K gt FSK The detection mode command determines how t
16. D CONTENT OF USER MANUAL This manual provides installation and operation instructions as well as pertinent technical data for the RCU 400A Receiver Control Unit The manual was prepared using MIL STD 1221 Department of Defense Handbook for Evaluation of Commercial Off The Shelf COTS Manuals as a guideline It is organized into Chapters along with a Table of contents List of Illustrations and List of Tables Chapter 2 presents general information about the RCU 400A Receiver Control Unit RCU including functional capabilities performance specifications and physical characteristics Chapter 3 provides information concerning the unpacking inspection and mounting of the RCU This chapter also provides instructions for making connections to the RCU as well as identifying the use and location of front panel controls and displays and chassis mounted components Chapter 4 provides detailed step by step operating instructions with illustrations for all modes of Receiver Control Unit RCU front panel functions Chapter 5 provides a brief theory of operation to provide the User with a working knowledge of the RCU Chapter 6 contains the information and steps required to initially load or update the RCU Firmware Chapter 7 Provides the User and System Manager with the data necessary to effect remote control of the RCU to include interface description message formatting and command descriptions Chapter 8 describes the Audio Streaming function
17. MNU button again to enter the IP address set up screen When the IP address screen is displayed pressing the button located below any octet of the address will allow the number to be changed using the Main Tuning knob To move between IP addresses use the lt and gt arrow keys When editing of the IP address is complete press the MNU button to return to the main display screen Then turn the RCU OFF then back ON The RCU 400A is now configured to use the new IP addresses See Figure 4 3 PN 74436 4 4 FIGURE 4 3 IP ADDRESS Octet Upon application of power to the receiver s and the RX 400A Receiver Control Unit the RCU LCD display will indicate the RCU software version and applicable date followed by a readout of SEARCHING FOR RECEIVER See Figure 4 4 FIGURE 4 4 Power Up Display Upon finding the RX 400A Receiver the LCD display will depict the initial factory default settings PN 74436 4 5 4 4 3 Factory Set Defaults After the RCU finds the connected receiver it will set the receiver to factory defaults for frequency detection mode BW AGC mode RF Gain Squelch receiver number and tuning step size as shown in FIGURE 4 5 FIGURE 4 5 Power Up Factory Default Settings 4 4 4 Operation The RCU 400A is designed to provide the operator the facility to search for signals of interest perform signal monitoring and signal collection tasks This is accomplished using three different signal acquisition modes 1 Manual
18. N lt cr gt Get command 1 lt gt Response GINNNN lt cr gt Definitions NNNN Valid range 0001 9999 in ASCII decimal format Leading zeros can be omitted The attack rate is used in automatic gain control AGC to select the rate to raise the volume for weak signals to try to maintain an approximately constant average output level of varying signal levels Set Decay Rate G2 Format Set command G2NNNN lt cr gt Get command 2 lt gt Response G2NNNN lt cr gt NNNN Valid range 0001 9999 in ASCII decimal format Leading zeros can be omitted The attack rate is used in automatic gain control AGC to select the rate to lower the volume for strong signals to try to maintain an approximately constant average output level of varying signal levels Set Hang Time G3 Format Set command G3NNNN lt cr gt Get command 3 lt gt Response G3NNNN lt cr gt NNNN Valid range 0001 9999 in ASCII decimal format Leading zeros can be omitted 7 15 Unit fault Status 11 Format Set command IIKKKKKKKKKK cr Get Command 2 1 lt gt Response single character letter code KKKKKKKKKK This will be a key code used in the set command to clear out all error codes logged in the unit The key code will be a 10 character hard coded value used by Ten Tec Service to clear out the error codes Error Code Definitions This command will report error codes and fault conditions v
19. OL UNIT INTERFACES 7 1 INTRODUCTION This chapter describes the RCU 400A control interfaces and the associated command set All features of companion RX 400A Receiver s are controllable through the interfaces by command words generated by the RCU In addition the Ethernet interface provides audio streaming from the receiver to the RCU 400A Receiver Control Unit or PC or any device that can process variable sample rate PCM data delivered via UDP packets Mission Downloads may also be passed to Receivers from a host PC or Workstation via the RCU using the Ten Tec Inc MDS 4001 L3 P N 09CD0189 001 software package 7 2 SERIAL INTERFACE DESCRIPTION The RCU 400A Receiver Control Unit has the capability to accept commands via a host computer or other controller that is equipped with a RS 232 interface or an Ethernet port and capable of transmitting and receiving ASCII standard encoded characters A baud rate hardware configuration can be selected via switches 2 and 3 of the Configuration DIP switch The RS 232 interface of the RCU 400A is physically implemented on a rear panel standard 9 pin D connector This interface has a full duplex operation meaning that it can transmit and receive data simultaneously The baud rates are selectable via configuration dip switches SW2 and SW3 Refer to Table 7 1 9600 19200 57600 default Table 7 1 Baud Rate Switch Settings The RCU 400A is set up with a fixed data word frame format consis
20. Range 0 999 emory Channel Skip Add P3 Format Set command P3CCCX lt cr gt 1 Get command lt gt Response P3CCCX lt cr gt Definitions CC specifies the channel to be added or deleted to the memory list when scanning Range 0 999 X lt A gt adds the specified channel to the memory list when scanning S removes the specified channel from the memory list when scanning 7 18 Start Halt Pause Resume Memory Scan P4 Format Set command P4X lt cr gt Get command Not applicable Definitions X lt S gt start scanning for activity on pre programmed memory channels The receiver will use the specified channel range via command P4 If no range has been specified using command P4 the valid channel range will be from 0 999 NOTE if no channels are found to be programmed an error will be returned when the 5 is transmitted to start scanning NOTE the time between scanning uses the time set in the Gaze Time T3 command lt H gt halts or stops program scanning and returns to manual mode The receiver will remain tuned to the channel it is currently set to when receiving this command lt P gt pauses channel scanning if currently in scan mode Ignored if receiver not currently in scan mode lt R gt resumes channel scanning if currently in paused mode Ignores this command if not currently in paused mode Squelch Notes Unlike HF rec
21. Tuning 2 F1 Start F2 Stop Frequency Step Tune Scans and 3 Directed Search by scanning previously loaded memory channels Memory Channel Scan Mode These modes of operation coupled with scan frequency lock outs and memory channel skip functions provides a very versatile COMINT intercept tool A Multi pot main control knob is used for manual frequency tuning and other receiver parameters such as BFO offset RF Gain and Squelch in conjunction with dedicated and soft key pushbutton switches This sub chapter provides step by step instructions for the RCU 400A Receiver Control Unit The instructions are supported by panel display depictions with appropriate call outs and primary operating mode flow diagrams PN 74436 4 6 4 4 4 1 Manual Tuning Manual tuning consists of using the main rotary control knob to tune through frequencies of interest To perform Manual Tuning see Figures 4 6 and 4 7 4 4 4 1 1 Step Size Prior to tuning the desired tuning step size is selected by depressing the STEP pushbutton This high lights the step size on the display To change the current value scroll through the values using the lt gt arrow keys The value of step sizes range from 1 Hz to 1GHz 4 4 4 1 2 Using the FREQ Button Another method of tuning involves the FREQ key Depressing this button high lights one of the frequency digits on the display Use the lt gt arrow keys to move left and right to select digit that will be chang
22. U and CWL By using lt gt keys selects Receiver number to be controlled by RCU 001 through 007 Selects frequency step size when tuning receiver use lt gt keys to set value from 1 Hz to 1GHz F1 F2 PAU Selects F1 F2 frequency scan mode display to enable entry of scan parameters alternately pauses scan TABLE 4 1 CONTROL FUNCTIONS 4 3 PN 74436 Table 4 1 continued Control Label Control Function SCAN RES Selects the Scan Mode screen from which F1 F2 and Memory Scan modes can be launched alternately resumes scan after a halt Depressing this key displays receiver IP and MAC Addresses in sequence using the lt gt keys also selects BIT test for selected receiver Scrolls through FAST MEDIUM SLOW and PRGM AGC modes Depressing FREQ and using lt gt keys in this case left and right selects and high lights the frequency digit to be changed with the Main Tuning Knob 4 4 2 Initial Configuration Upon Power Up Initial configuration of the RCU 400A requires setting the IP address of the RCU and RX 400A receivers connected to the RCU Also if the RCU will be connected to a receiver located off site the IP address of the gateway will also need to be programmed into the RCU 400A Under normal operation the IP address can be viewed on the RCU but cannot be altered To enable editing of the IP address hold down the MNU button while turning on the power to the RCU When the main display screen appears press the
23. acking 9 2 CLEANING AND LUBRICATION Panel surfaces may be cleaned using a soft damp cloth and a mild detergent solution Never use caustic cleaners or any type of solvent as this may damage painted and chem treated surfaces and plastic parts and knobs 9 3 INSPECTION The RCU 400A Receiver Control Unit should be checked for external damage or component wear periodically This should include inspection of the front panel phone jack for looseness proper power switch operation Main tuning and volume control knob tight on it s shaft and properly functioning pushbutton switches Also check the LCD display for cracks inoperative backlighting and missing alphanumeric screen data Any time the unit is out of the rack console or if access is available to the rear of the RCU the rear panel connectors should be checked for damage or looseness 9 4 PERFORMANCE VERIFICATION AND FAULT ISOLATION User level maintenance is limited to those tests that can be made at the operator position Performance verification consists of normal operation of the unit that is the RCU seems to exhibit correct control functions and displays relative to RX 400A receiver operation to include detection mode selections match the signal demodulation IF bandwidth selections result in expected audio response results without distortion and that audio outputs are present It is also useful to check for proper operation of manual tuning F1 F2 scan mode and memory channel scan mo
24. ad firmware into the RCU 400A Receiver Control Unit perform the following steps 1 Turn RCU 400A power to OFF With reference to paragraph 3 7 of this manual place the 1 switch of the left hand Configuration Dip Switch section to the down position Connect a serial cable from the RCU RS 232 connector to a USB port on the laptop or PC Turn the RCU power ON Click and open the Update utility icon on the laptop or PC desktop Click Settings then click Setup On the setup window check the serial port box Select the COM port you want to use Note the IP address UDP port and radio pass code entries Click OK e Eo gor m e 6 1 Firmware Load Update Steps cont d Now click Process on the Flash Utility window Click on Update Radio A select Firmware Update File window appears Select Look In Desktop Scroll down through the listing until the desired ruf file is located Highlight the file then click Open The load preamble text will be displayed then the Erase steps will occur and the firmware will then load 4096 lines of new firmware code Upon completion of download a successfully loaded window will appear Close the application Place the Receiver power to OFF Disconnect the serial cable Return the 1 configuration switch to the UP position Turn RCU power ON This concludes the firmware update procedure 6 2 7 0 RECEIVER CONTR
25. adio NNNNN valid range 0 65520 Set Gateway Router IP Adress E4 Format Set command E4AAA lt dot gt BBB lt dot gt CCC lt dot gt DDD lt cr gt Get command E4 lt cr gt Response E4AAA lt dot gt BBB lt dot gt CCC lt dot gt DDD lt cr gt Definitions octet of the gateway IP address Range 0 255 BBB The 2 octet of the gateway IP address Range 0 255 CCC The 3 octet of the gateway IP address Range 0 255 DDD The 4 octet of the gateway IP address Range 0 255 The octet addresses can be specified using 1 2 or 3 digits If less than 3 digits are specified for the octet address a dot character lt 0x2E gt must sent between the octets to differentiate between address values Disable Ethernet Communications Port E5 Format Set command 5 lt gt Get command Not applicable Definitions This command will disable Ethernet communications Enable Ethernet Communications Port E6 Format Set command K6 lt cr gt Get command Not applicable Definitions This command will enable Ethernet communications Tune Frequency F1 The command allows the tuned frequency of the RX 400A to be set to any value between 100kHz and 3 Gigahertz in 1 Hz increments S Format Set command FIFFFFFFFFFF lt cr gt Get command 1 lt gt Response FIFFFFFFFFFF lt cr gt Definitions FFFFFFFFFF Selects the frequency to tune in
26. ameter Specification 0 to 50 degrees C full specification Functional 10 to 60 degrees C 40 to 70 degrees C 10 9596 without condensation 15 000 feet MSL un pressurized 2 4 MECHANICAL The RCU 400A is housed in a standard 2U high EIA half rack chassis It has a behind the panel depth of 16 00 inches 407mm excluding connectors Construction is all aluminum with wrapped corners and a thick front panel to accommodate rack mounting Top and bottom covers are affixed using flat head screws 10 32 threaded inserts are installed in the chassis sides to accommodate user slides The rear panel has a 10 32 threaded insert to accept a chassis ground connection The chassis is chem treated to resist corrosion and the front panel is painted gray with black silk screening The RCU 400A weighs 7 60 Ibs 3 45 kG Figure 2 3 depicts a 3 view drawing for the RCU 400A Receiver Control Unit PN 74436 2 5 2 5 ELECTRICAL Power requirements for the RCU400A are presented in Table 2 3 TABLE 2 3 RCU 400A POWER REQUIREMENTS Parameter Specification Line Voltage 90 to 264 VAC Frequency 48 440 Hz single phase Power Consumption 15 Watts nominal Power Connector Circular MS type connector 3 pin male Spikes and Noise Designed to meet MIL STD 704 but not tested at factory Power Connection Pin A AC High Pin B AC Low Pin C AC Ground Phones LCD Display Ethernet LAN RCU 400A RECEIVER 8 port Ethernet Switch CONTROL UNIT
27. cal i oe ene ie Mond tac 3 0 PREPARATION FOR USE AND INSTALLATION 3 1 Unpacking and Ju dee arai cat s doo 343 tu 3 4 Rear Panel Sol Power Cable cc ode tise d DO dote Lots 3 4 2 External 3 4 3 Audio 3 4 4 Remote Control 2 3 4 5 Connection to RX 400A 3 5 Configuration Dip SWitCh SoG e PISO us oa an 3 7 Front Panel Controls and dob Power SWiteh m zoe e Se hess ite 3 732 erede tata Erie ede eias 22722 Push soie 3 7 5 Volume iet ree 38 3 9 Chassis GEOUITGL 3 10 Typical to 40 OPERATION 441 POWER ON OEF 4 2 Headphones TABLE OF CONTENTS PE EY YY YY YY YY YY
28. can Mode Set Up Notes 1 Provision to access 100 memory channels 00 99 is currently installed in RX 400A receivers although the receiver contains 1000 memories Future revision will expand access to 1000 channels 2 For Memory Channel Scan Mode set up for GAZ DWL and DED required same as for F1 F2 Scan See 4 4 4 9 PN 74436 Frequency to be stored in Channel Number Channel status channel 00 FIGURE 4 16 Memory Channel Scan Mode Set Up 4 4 4 12 Memory Channel Scan Operation To run the Memory Channel Scan Mode depress the SCAN RES button From the display selection push the button under MEM This starts the Memory Channel Scan Mode and CH SCAN ACTIVE will be displayed above the frequency readout The scan will stop on frequencies having signal levels above the threshold set by the squelch SQL control If there is no signal at a channel the receiver will remain on that channel unit the GAZ time has expired upon which the channel scan will resume If the receiver stops at a channel with a signal the operator can monitor the signal to determine if he wants to halt the scan by depressing the button under HLT or he can push the button under SKP to remove this frequency from the scan list This is accomplished by pushing SKP and then SCAN RES The skipped channel will not show up on future memory channel scans GAZ DWL and DED function the same as for the F1 F2 Scan Mode To stop the memory channel scan mode depress EXIT T
29. cribes these steps Also refer to Figures 4 12 and 4 13 which show the Scan set up display screens Depress F1 F2 PAU button This brings up a Scan screen Depress the key below F1 this is the start frequency set in the F1 frequency Press F1 again This sets value a 7 Set in the value as done for F1 and F2 steps Verify all entries for F1 F2 and FS are correct push EXI TABLE 4 3 Scan Mode Set Up PN 74436 4 13 Table 4 3 Continued Depress the SCAN RES button This brings up the second Scan screen Now set the GAZ Gaze time waiting for a signal to come up after stopping on a frequency expressed in milliseconds by depressing button below GAZ on the display by using the arrow keys or main tuning knob Now depress SET to enter value Depress EXIT Now set the DWL Dwell time receiver stays on a frequency after signal detection expressed in milliseconds SET in the value then press EXIT 1 Now set the DED Deadtime time receiver stays on a frequency after signal presence goes away expressed in milliseconds SET in the value then press EXIT Step 11 concludes the F1 F2 Frequency Scan Mode set up procedure 10 1 Note For GAZ DWL and DED a value greater than 00050 must be entered a 00000 value is invalid and may cause the Scan Mode to malfunction RCU lock up FIGURE 4 12 SCAN F1 F2 FS Entry Showing FS value PN 74436 FIGURE 4 13 Gaze Dwell and Dead time Showing times of 500 mi
30. ddress Mode 7 4 7 6 1 Command Descriptions The following will define a functional description of each control command or query command sent out from the RCU to companion RX 400A Receiver s Hardware HF Attenuator On Off Controls the hardware attenuator This attenuator is active in the HF bands only Format Set command AOn lt cr gt Get command 2 0 lt gt Response 0 lt gt 1 Definitions N 1 or 0 where 1 turns the attenuator on and 0 turns the attenuator off BITE System Self Test B B2 B3 Initiates the BITE process When completed the system will report PASS or FAIL Format Set command Bn lt cr gt 1 The system will run internal diagnostics and report PASS or FAIL Definitions N 1 2 or 3 Store Memory Channel Stores current operating Frequency and Detection Mode to the indicated memory channel Format Set command COnnn lt cr gt Definitions 1 n 3 digit memory channel 0 to 999 7 5 Set Manual AGC Attenuation Sets the amount of AGC attenuation to apply Adjusts from 000 120 dB range with 0 10 dB resolution Can be set in any mode Receiver gain is reduced and AGC threshold is increased by the number of dB indicated Format Set command CIAAAD lt cr gt Get command 1 lt gt Response C1AAAD lt cr gt 1 Definitions AAA 000 120 represents the amount of attenuation in db Range 000 120 D represents 10 resolut
31. de along with RF gain squelch and BFO function 9 1 10 0 PREPARATION FOR SHIPMENT OR STORAGE 10 1 STORAGE If the RCU 400A Receiver Control Unit is not going to be used for an extended period of time in excess of 30 days it should be stored in its sealed shipping carton or equivalent container The unit is rated for storage temperatures from 40 to 70 degrees C To prepare the unit for storage perform the following steps 1 2 Remove all cords or cables attached to the unit Ensure there is sufficient bubble wrap or packing material in the container Place the unit in the center of the packing material Place packing material on top of the unit and seal the container Fasten labels or stamps and with indelible ink write the word FRAGILE on all sides of the container Also write the model number nomenclature quantity and serial number on the top of the container 10 2 PREPARATION FOR SHIPMENT If the RCU 400A is required to be shipped to another location or back to the factory for service perform the steps in 10 1 above Also include a packing slip any pertinent instructions or purchase order paperwork inside the container on top of the packing material Affix a shipping label to the outside of the container 10 1
32. ding zeros can be omitted but the lt dot gt character must be transmitted to differentiate between the frequency and the bandwidth values BBBBBB specifies the 6 digit ASCII decimal bandwidth to add subtract from the specified Delete Lockout Frequency F7 Format Set command F7NN lt cr gt Get command Not applicable Definitions Specifies the record number in which to delete the lockout frequency value that is stored there 0 49 Add Lockout Frequency Range F8 Format Set command F8NNSSSSSSSSSS lt dot gt EKEZEEEEEEEE lt cr gt 1 Get command lt gt 1 Response F8NNSSSSSSSSSS lt dot gt EEEEEEEEEE lt cr gt Definitions NN specifies the record number 0 24 Note If NN value is 00 the radio will respond with all the record numbers and values that are programmed in the following format F8NNSSSSSSSSSS lt dot gt EEEEEEEEEE lt cr gt F8NNSSSSSSSSSS lt dot gt EEEEEEEEEE lt cr gt 1 F8NNSSSSSSSSSS lt dot gt EEEEEEEEEE lt cr gt SSSSSSSSSS Specifies the starting frequency for the lockout range entered in ASCII decimal format Leading zeros can be omitted but the lt dot gt character must be transmitted to differentiate between the leading frequency and the ending frequency values Range 0 3Ghz 7 14 EEEEEEEEEE Specifies the ending frequency for the lockout range entered ASCII decimal format Set Attack Rate G1 Format Set command GINNN
33. display and Figure 4 15 provides a flow chart for the F1 F2 Scan Mode PN 74436 FIGURE 4 14 F1 F2 SCAN MODE Showing receiver starting scan mode at F1 108 MHz with F2 136 MHz and a frequency step of 1kHz START SELECT F1 F2 DEPRESS F F TO START able 4 4 Refer to Figure 4 16 to view the Memory Channel Set Up screen Step Number In the Manual tune mode select the frequency detection mode IF bandwidth AGC mode and RF gain Squelch settings This set will be the parameters stored into the first memory channel 2 Push SCAN RES button Depress button below MEM display This brings up the Memory screen 4 With the main rotary control or arrow keys select the memory channel that is to be loaded Generally start at 01 Push the button below the STR display This stores the first Frequency into memory channel 01 Push EXIT then set up the next frequency and operating parameters as in step 1 Then repeat step 2 Repeat step but increment the channel number to 02 Repeat these steps up to channel 99 This action manually loads a mission into the receiver Push EXIT 5 To verify the memory contents depress MEM select memory channel number and depress the button under RCL Repeat for each memory channel 6 To clear any memory channel of its content select memory channel number and depress the button under the CLR display 7 To conclude the memory channel set up depress EXIT TABLE 4 4 Memory S
34. eadphones audio is available on a front panel jack and analog line audio for the selected receiver is provided on a rear panel connector FIGURE 2 1 RCU 400A Front View PN 74436 2 1 FIGURE 2 2 RCU 400A Rear View All electrical interface to the RCU is via rear panel connectors for power external reference line audio outputs and remote control Seven 7 of the eight 8 ports of the Ethernet switch are available for connection to RX 400A receivers The RCU 400A contains two 2 command and control ports an Ethernet IP RJ 45 connector and a standard RS 232 connector Generally the RS 232 port is used as the firmware update port and the Ethernet port accommodates a connection to the system LAN for mission download capability The RCU 400A contains all the circuitry required to effect control of up to seven RX 400A receivers The major assemblies consist of 1 a front panel with an LCD display main tuning knob audio volume control and headphones jack 2 a Logic DSP assembly 3 an remote interface board 4 an eight port smart Ethernet switch and 5 an AC power supply Internal RCU firmware establishes the operating features and parameters necessary to control and display all RX 400A receiver functions This firmware can be updated in the field using a laptop computer or system host PC workstation with the appropriate drivers See Chapter 6 for details PN 74436 2 2 2 2 SPECIFICATIONS TABLE 2 1 Parameter Feature
35. ed using the main tuning knob This method is useful when making a move from one frequency band edge to another or when the operator wants to step through channelized frequency allocations Tuned frequency RF Gain Attenuatio AM Detection value Mode AGC Mode Tuning Control Tuning Receiver 71 100 Hz tuning Step Size PN 74436 15 KHz IF Bandwidth PN 74436 FIGURE 4 6 Manual Tuning 4 7 FIGURE 4 7 Manual Tuning Flow Chart FIGURE 4 7 Manual Tuning Flow Chart PN 74436 4 8 4 4 4 2 Using the Arrow lt gt Keys The arrow keys function as Up Down or Left Right controls for several receiver operating parameters where lt is Down Left and gt is Up Right The arrow keys are associated with the top row of pushbuttons that is when one of these parameters is selected and high lighted on the display the arrow keys are used to set the value or select the mode for that parameter exception is when the FREQ button is depressed which is discussed in paragraph 4 4 4 1 2 Table 4 2 lists the parameters controlled by the Arrow Keys Scroll through AM FM USB LSB CWU and CWL detection modes Sets RF Gain attenuation in 10 dB steps from 00 to 120 Sets BFO offset in 100 Hz steps from 000 to 8000 Hz Scrolls through available IF bandwidth Filter selection 100Hz to 300 kHz TABLE 4 2 Arrow Key Functions SQL Sets Squelch level in steps of 10 from 00 to 120 4 4 4 3 Detection Mode Pushing
36. eiver using a dedicated Ethernet cable between a numbered RJ 45 jack on the RCU rear panel and companion RX 400A Receiver s where both equipments are either co located or at a different position provided standard Ethernet cable run length conventions are not exceeded This connection provides the control and status data link as well as providing the path for receiver digital audio streaming to the RCU When connected in this arrangement The RX 400A s and the RCU 400A should be connected to the Ethernet switch with receivers connected to ports 1 through 7 and the RCU connected to port 8 with a short cable to the Ethernet interface jack PN 74436 3 3 81 006 SPS 209 045 8 FIGURE 3 2 RX 400A and RCU 400A INSTALLATION PN 74436 3 4 7 58848680 5555845 8 Figure 5 Audio Connections Pin Description Note 1 Chassis Ground 2 A C Coupled Mono Audio Unbalanced 10dBm output ANB base nominal 4 Line B center tap o o 5 Line B ES a eee 6 Line A 600 Ohm balanced output 0 dBm nominal 7 Line A center tap Pe 8 Line A 9 Chassis Ground 10 DC Coupled Mono Audio Unbalanced 104 output 11 No Connection 12 User Programmable Output 1 Low 0 volts High 3 3v not available when frequency extender attached 13 User Programmable Output 2 Low 0 volts High 3 3v
37. eivers in the case of the Ethernet I O The front panel assembly feeds the Logic DSP section with receiver control parameter values from its main rotary control and pushbutton switches These control inputs are converted into command words for transmission to the RX 400A receivers via the Ethernet switch The Logic DSP section also contains D A converters to re construct the digital audio streams into analog headphone and line audio outputs The Logic DSP section also has an internal clock reference oscillator for the processor and will accept an external reference of 1 2 5 or 10 MHz should the application require a common external for all system devices On board regulators provide 1 2V and 3 3V for the DSP core 5 2 2 Ethernet Switch The built in Ethernet switch is a smart type switch with 8 RJ 45 ports 7 of the ports are used for connection to RX 400A receivers and the 87 port is used to connect the switch to the RCU via its Ethernet jack The switch automatically searches for receivers on its ports When the RCU has established connection to one of the configured receivers through the switch it stops the search process and displays the settings of the RX 400A receiver it is communicating with If the application calls for other than the normal local sub network where connection is required to an external network via a server or another switch then the RCU internal Ethernet switch will manage the data flow between the units and
38. eivers VHF UHF receivers need noise squelch window squelch and signal level squelch It is not sufficient to rely on carrier to noise ratio alone to determine if Signal is present in a channel Set Signal Strength Squelch S1 Format Set command SILLL lt cr gt Get command 251 Response S1LLL lt cr gt Definitions LLL the level that will be compared to the current signal strength level used to determine if a valid signal is present If the current signal strength is found to be less than this value the signal is found to be invalid and the audio will be muted Valid ranges 0 127 Leading zero s can be omitted 7 19 Current Signal Strength S3 Format Set command Not applicable Get command 253 lt gt Response S3NNN lt cr gt NNN Current measurement of signal strength Valid ranges 0 127 This command will report the current signal strength value that is updated in the firmware This is the value that is compared to the squelch level set in the S1 command If this value goes below the squelch level the audio will be muted Squelch Status S4 Format Set Command Not applicable Get command S4 lt cr gt Definitions TBD Dwell Timer T1 Format Set command TITTTTTTTT lt cr gt Get command T1 lt cr gt Response TITTTTTTTT lt cr gt 1 Definitions TTTTTTTT represents the time in ASCII decimal format Value number of milliseconds Valid ranges
39. emory Chapter 7 of this manual contains the command word structure PN 74436 4 4 4 7 BFO Operation The Beat Frequency Oscillator BFO is adjusted by pushing the BFO button which high lights this function on the display The offset value is adjusted up and down in 1 Hz steps by rotating the main tuning knob The total range is 000 to 8000 Hz While the BFO is generally used for CWU and CWL detection modes the BFO is active in all detection modes 4 4 4 8 The Menu Key Depressing the MNU Menu button brings up a display screen that shows the software version MAC address and IP Address for Receiver number 1 Using the UP arrow key sequences through the MAC and IP addresses of receivers 2 through 7 followed by the Gateway IP address then the software version MAC and IP addresses for the Receiver Control Unit The last button push in the sequence brings up a BIT test screen that provides the operator the choice of running a BIT test of the RX receiver RCU receiver control unit and MEM memory PASS or FAIL is indicated for the RX and RCU The MEM display will read DISABLED Figures 4 8 through 4 11 depict MNU screens FIGURE 4 8 RX Address PN 74436 4 11 FIGURE 4 9 Gateway Address FIGURE 4 10 RCU Address PN 74436 4 12 FIGURE 4 11 BIT Screen 4 4 4 9 Setting Up F1 F2 Frequency Scan Mode Setting up the RCU for the F1 F2 Frequency Scan Mode requires several steps in the correct sequence Table 4 3 lists and des
40. erformance Verification and Fault Isolation 10 0 PREPARATION FOR SHIPMENT OR STORAGE 10 1 Storage 10 2 Shipment Important Operational Note PN 74436 FIGURE 2 1 2 2 2 3 2 4 3 1 3 2 3 3 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 4 16 4 17 4 18 5 1 LIST OF ILLUSTRATIONS TITLE PAGE RCU 400A Front 4 4 4 484 2 1 RCU 400A Rear 44444422222 2 2 2 RCU 400A Three View Drawing esee 2 4 RCU 400A Electrical 2 6 RX 400A amp RCU 400A Rack 3 3 RX 400A amp RCU 400A Installation 3 4 RCU RX 3 7 52 0 4 1 Front Panel 4 2 TP AGO 55 ce 4 5 4 5 Power Up Factory Default 4 6 Manual a rubias dE grade er exis reps 4 7 Manual Tuning Flow 4 8 29444 4 4 11 Gateway Add ese rese 4 12
41. he pushbutton Signal Strength Bar graph LCD Display Main Rotary Control Multi Pot Specific Function or Soft Keys Power Audio Gain dod Specific Function Keys ON OFF FIGURE 4 2 FRONT PANEL OVERVIEW The depicted display shows the top row acting as specific function keys The Soft Key mode for the top row is generally used for Frequency Scan and Memory Scan Modes and will be described in later paragraphs 4 2 PN 74436 4 4 1 1 Control Functions With reference to FIGURE 4 2 Front Panel Overview the following descriptions in TABLE 4 1 below apply for each control function Control Label Control Function 0 Power ON OFF switch 1 None Main Knob Multi pot for frequency and parameter settings 1 8 stereo headphones jack and audio gain control LOCAL Indicator illuminates when in local mode LOCK Indicator illuminates when RCU controls are locked BW Selects receiver IF bandwidth pushing BW scrolls through available bandwidths or use lt gt keys 27 filters from 100 Hz to 300 kHz MEM HLT Selects Memory Channel Scan Mode or halts scan BFO Enters value of BFO offset via Multi pot or lt gt keys displayed in Hz from 000 to 8000 RF SQL Toggles between RF gain and Squelch setting use Multi pot or lt gt keys to set value range for both parameters is 000 to 120 DET Select receiver detection mode pushing button scrolls available modes or use lt gt keys for AM FM USB LSB CW
42. he signal is to be demodulated The receiver supports AM USB LSB CWU FM CWL FSK detection modes The detection mode will be selected for the current frequency selected by the receiver AUTO MODE Software Reset Reboot Unit C9 Format Set command C9 lt cr gt Get command Not applicable Definitions This command will perform a soft reboot to the receiver The unit will be initialized as if the power were removed The ASCII string RADIO START will be transmitted by the radio when reset is complete Load EEprom Defaults D1 Format Set command D1PPPPP lt cr gt Get command Not applicable Definitions PPPPP is the 5 ASCII digit pass code that must be entered to download default values to EEprom and is defined as 12461 This command will load all defaults settings to EEPROM A valid five character password must enter with this command before the command will be accepted NOTE This command could take up to 10 seconds to complete The user should wait for the ASCII string RADIO START that will be transmitted by the radio when the download is complete AGC Dump D2 Format Set command D2 lt cr gt Get command Not applicable Definitions This command will terminate the current AGC state and refresh the AGC system This will cancel HANG or DECAY in process This is most effective for canceling a long AGC recovery delay that may be suppressing the recei
43. his returns the receiver to the manual tune mode Refer to Figure 4 17 it depicts a typical screen for the Memory Channel Scan Mode Figure 4 18 provides a flow chart for the Memory Channel Scan Mode PN 74436 4 18 hannel Scan Mode running Channel 01 frequency FIGURE 4 17 Memory Channel Scan Mode 4 4 4 13 Local and Lock Buttons The LOCAL and LOCK buttons are located above the main tuning knob The LOCAL button controls the source of the RCU s data display When the LOCAL LED is illuminated The RCU data is used When the LOCAL LED is out the data from the receiver is used The LOCK button locks the main tuning knob shaft encoder outputs so turning the knob will not alter receiver frequency settings The button illuminates when pushed 4 4 4 14 MIS Softkey Function With reference to Figure 4 13 the MIS softkey using the global GAZ DWL DED times and squelch threshold setting allows the operator to enter up to 100 mission scan sets where a mission set can contain up to 100 memory channels Depressing the MIS button activates the mission scan routine Depressing HLT returns the RCU to the previous operating mode IMPORTANT OPERATIONAL NOTE MEMORY CLEAR FUNCTION Upon power down of RCU 400A and RX 400A Receivers all memory channel contents are cleared This feature provides data security PN 74436 4 19 SET FREQ DET Channel Scan FIGURE 4 18 Memory Channel Scan Mode Flow Chart PN 74436 4 20 5 0
44. ia one alphabetic character that are logged by the firmware They are defined as follows A Firmware Version 12 Format Set Command Not Applicable Get Command 2 lt gt Response CCCCCCCCCCCCC lt cr gt Definitions This command will report the firmware version number The following strings are defined and will be reported for the specific unit model numbers RX 400A Model VER lt 0x20 gt XXXX lt 0x5f gt 400 lt cr gt Note XXXX represents 4 digits that will increment h Fi Format Set command Not applicable Get command 212 lt gt Response CCCCCCCCCCCCC lt ecer gt Definitions This command will report the firmware version number The following strings are defined and will be reported for the specific unit model numbers RX400 model 7 16 VER lt 0 20 gt lt 0 5 400 lt gt Note XXXX represent 4 digits that will increment with each Firmware version release Unit Serial Number 13 Format Set command Not applicable Get command 213 lt gt Response I3SSSSSSSS lt cr gt Definitions This command will report the serial number assigned to each unit by Ten Tec The following format is defined To be determined Extended Firmware Info 14 Format Set command Not applicable Get command 214 lt gt Response to be determined Store To Memory Channel Stores current operating Frequency and Detection Mode t
45. in which it was received If the radio does not understand a command sequence or the command is badly formatted the radio will respond with a Z followed by a carriage return The output buffer is handled in circular fashion allowing simultaneous additions and outputting 7 3 COMMAND MESSAGE FORMATTING Command messages for the RCU 400A are exclusively ASCIT encoded data consisting of command headers and arguments Command headers consist of a two character letter digit mnemonics All queries consist of a question mark followed by a command header All set commands consist of an asterisk followed by a command header 7 4 TERMINATORS FOR COMMANDS AND QUERIES Terminators are used to signal the end of a command or string When a properly formatted message is ready to be sent a CR carriage return character should be entered The CR character instructs the receiver to process the preceding messages The RCU 400A also transmits a terminator when responding to queries After the query response is transmitted the receiver issues a CR carriage return indicating the end of the response 7 2 7 5 FORMATS OF QUERY RESPONSES The RCU 400A transmits responses to queries in a fixed field format Query responses begin with the letter digit mnemonic of the query in upper case characters followed by an alphanumeric argument Numeric arguments are represented by the least number of digits possible while still representing the entire
46. ing mode The units will respond to all commands until they have been reset via the C9 command power reset or the Ul command Mission Download to Format Set command M0 lt cr gt Get command Not applicable Description RR Receiver Number CC Mission Memory Channel Number MT Memory Type is R Range or channel Command set downloaded from host PC workstation with MDL Software package Example 1 02 8 0088000000 0108000000 0000100000 10 0 040 F 99 88 77 10 50 90 21 where sequence is for fstart fstop fstep filterB W detection mode rfgain squelch AGCmode attack decay hang gaze dwell deadtime memory group lt cr gt 7 22 8 0 AUDIO STREAMING 8 1 RADIO OVER IP RIP DATA FORMAT RIP is the system by which the RCU 400A receives real time streaming audio from companion RX 400A Receivers The RIP packets are sent from the receiver via standard UDP packets With each UDP packet containing a descriptive header and audio data block The RIP UDP Packet is based on the Real Time Protocol RTP RTP is the format utilized by various commercial Voice Over IP systems The format of the data packet used for RIP is as follows Octet 0 Header Information 0x80 RTP Format Octet 1 Header Information Continued 0x50 Octet 2 3 RTP Sequence Oxnn Oxnn Packet Counter last 1 used for verification of service Octet 4 7 RTP TimeStamp Oxnn Oxnn Oxnn Oxnn Time Counter last 64 Octet 8 11 RTP Sync Source
47. ion for the attenuation Example 107 8 dB attenuation will be entered as 1078 Decimal point is not allowed BFO C2 Format Set command C2nnnn lt cr gt Get command C2nnnn lt cr gt Definitions For CW detection mode operations The Beat Frequency Oscillator BFO capability is available The BFO is adjustable over a 8192 Hz range in 1Hz steps The BFO frequency can be applied to the received CW signal to alter its audio pitch as a detection aid The BFO and passband frequencies are respectively selected by the BFO commands 7 6 Bandwidth C3 The operator may select one of 18 available IF bandwidth filters Format Set command C3BB lt cr gt Get command 2 3 lt gt Response C3BB lt cr gt Definitions BB selects the desired bandwidth using 2 ASCII decimal digits See Table 7 3 for Filter selections Note Filter numbers are 2 ASCII digits Example lt 0 gt lt 0 gt for filter number 0 Filter Number Bandwidth Filter Bandwidth Number 07 17 08 3 1827 900 1002 09 202 Table 7 1 Bandwidth Filters o 11 02 12 03 433 04 e 14 05 15 06 16 07 k 17 Store Current Parameters in Sweep Range C4 Format Set command C4 lt cr gt Get command 4 lt gt Definitions 7 7 Automatic Gain Control C5 The receiver provides 3 preset Automatic Gain
48. isolate the RCU RX traffic from the outside network 5 2 3 Serial Interface The RCU 400A has a RS 232 serial interface using a rear panel 9 pin D connector This port is generally used to install or update RCU firmware This port transmits and receives full duplex standard ASCII standard encoded characters Baud rate for the interface is selected using the rear panel configuration dip switch Chapter 7 paragraph 7 2 lists the baud rates and associated switch positions as well as data word frame formats PN 74436 5 2 4 Display and Keyboard Section The front panel assembly of the RCU 400A is comprised of an LCD display its driver circuitry a main tuning knob shaft encoder a headphone volume shaft encoder and 14 pushbuttons that represent specific receiver control functions The display receives RX 400A operating parameters from the Logic DSP section via an on board front panel micro processor that formats the data for correct presentation on the LCD The LCD is a multi line alpha numeric display having a blue backlight that provides a good contrast between the characters and background The main rotary control is a ninety degree shift leading edge triggered shaft encoder that outputs pulses representative of the direction and speed of the knob These pulses are interpreted by the front panel processor which sends correctly formatted serial words to the Logic DSP section The 14 pushbuttons are arranged in a two dimensional matrix where pushbu
49. lliseconds set in for each value 4 4 4 10 Scan Mode Operation With the F1 Start F2 Stop FS Frequency Tune Step Size GAZ Gaze time DWL Dwell and DED Deadtime parameters set up and entered the F1 F2 Scan Mode is initiated by depressing the SCAN PAU button This will bring up the Scan screen Then push the button under F F on the display Now the receiver will begin scanning starting at the F1 frequency and stepping through frequency increments determined by the FS setting Assuming there are no signal levels above the set SQL threshold the scan continues at a rate established by the GAZ setting to the next frequency and finally to the F2 frequency and then starts the scan again at the F1 frequency F F SCAN ACTIVE is displayed above the frequency readout Every time the scan encounters a signal above the threshold level the scan will stop on that signal for a duration determined by the DWL and DED settings At this point the operator may stop the scan at this point by pressing HLT This allows the operator to monitor the signal Or when in HLT the operator can lock out this frequency from future runs of this scan routine by pushing L O On the next scan run this frequency will be deleted from the run To resume the scan routine push F F again to run the Scan mode To end the F1 F2 Scan Mode push the button below the EXIT display This will return the receiver to the Manual Tune Mode Figure 4 14 shows a typical F1 F2 Scan
50. nals close to the noise floor run the squelch at 00 that is wide open at the noise floor The Squelch setting is also used as a threshold when in the SCAN modes to determine the signal level that will trigger the scan routine to stop on a signal of interest The required squelch setting is somewhat determined by particular band conditions and signal levels relative to the noise level 4 4 4 6 AGC Settings Repeated pushes of the AGC button scrolls the AGC setting from Slow Medium Fast and Program modes With no signal present the AGC will run the receiver gain at a high level for maximum sensitivity Upon receiving a signal the AGC automatically sets the receiver gain based on the strength of the signal The AGC mode is selected based on band conditions and the type of signals being received in that band Typically it is desirable to set the AGC in the SLOW mode for signals with steady carriers such as AM and FM The MED mode is useful for SSB signals and for band conditions with considerable signal fading The FAST mode works well with fast rise and fall time signals such as CW code data formats and push to talk voice and burst data transmissions Slow Medium and Fast AGC modes have factory selected attack decay and hang times The PRGM mode permits the user to enter a custom set of AGC time constants to match particular signal formats This accomplished via a command word downloaded from a host PC or workstation to the receiver flash m
51. not available when frequency extender attached 14 User Programmable Output 3 Low 0 volts High 3 3v not available when frequency extender attached User Programmable Output 4 Low 0 volts High 3 3v not available when frequency extender attached Part Number 74416 Ten Tec RX400 Manual Revision 0 5 TABLE 3 2 RX 400A AUDIO CONNECTIONS PN 74436 3 5 If connection to another network is required it should be made to the Ethernet switch This Ethernet switch is an active switch that will manage the data flow between the two units while isolating traffic between the RCU and RX 400A receivers from the outside network resulting in reduced global network traffic 3 5 CONFIGURATION DIP SWITCH The rear panel contains a recessed two section Dip Switch used to set the operating configuration for the Receiver The first section contains 8 switches and the second contains 4 switches For normal RCU 400A operation place the first section with switches 1 2 and 3 in the UP position and 4 through 8 in the DOWN position All four switches 1 through 4 are placed in the UP position for the second switch section p w ow ow Y 12345678 1234 3 0 FUSE A replaceable fuse is located above the power connector on the rear panel The fuse is removed and replaced using a small 1 8 wide common blade screwdriver Replace it with a 5x20 mm 1 Amp 250VAC time delay fuse 3 7 FRONT PANEL CONTROLS AND DISPLAYS The RCU 400A is designed to
52. nsure the comms link to each receiver is properly established Upon power down turn the RCU OFF followed by the receiver s 4 2 HEADPHONES VOLUME The headset audio level may be adjusted by rotating the VOLUME control minimum at full CCW position full volume at full CW position 4 3 CONFIGURATION SWITCH SETTINGS Verify that the rear panel Configuration Switch Settings are as described in paragraph 3 5 of this manual 4 4 DETAILED OPERATING INSTRUCTIONS For most operations a standard control convention sequence is employed relative to the pushbutton and rotary control actions as depicted below Use Main Rotary Control or Select and Up gt Down lt Push Keys to Set Key Push Exit if shown f no Exit above Soft shown select next function Function or ParameterVa Mode Button lue FIGURE 4 1 Control Convention PN 74436 4 4 1 Front Panel Overview The front panel contains a large LCD display which presents a selected receiver operating parameters a large main rotary control an audio gain control for the headphones ON OFF power switch a LOCAL indicator LOCK indicator and two rows of pushbuttons 7 in each row The bottom row of pushbuttons are dedicated to specific functions and the top row of pushbutton are either directly associated with the function call out on the button or act as soft keys when functions in the display above each key are for additional operations not labeled on t
53. o the indicated memory channel Format Set command POnnn lt cr gt Get command POnnn lt cr gt reports contents of memory channel without recalling the data Definitions 1 n 3 digit memory channel 0 to 999 7 17 Store Current Parameters in Memory Channel P1 Format Set command P1CCCBBMSSRFFFFFFFFFF lt cr gt 1 Get command 1 lt gt Response P1CCCBBMSSRFFFFFFFFFF lt cr gt Definitions CC Channel Number to assign parameters Range 00 999 in ASCII decimal format BB Selected IF Bandwidth filter number assigned to the specified channel number Range See Table 5 M Selected detection mode assigned to the specified channel lt A gt AM lt F gt FM lt U gt USB lt L gt LSB lt C gt CWU lt W gt CWL lt K gt FSK SS Selects the desired squelch mode settings Multiple squelch modes can be selected R lt A gt channel specified in command is added to the channel ring lt D gt channel specified in command is deleted from the channel ring FFFFFFFFFF Frequency to tune assigned to specified channel number Range 100kHz 3 GHz Leading zero s can be omitted Memory Scan Channel Start Stop Range P2 Format Set command P2SSSEE lt cr gt 1 Get command P2 lt cr gt Response P2SSSEE lt cr gt Definitions SS Specifies the starting channel for the memory scan via two ASCII digits Range 0 999 EE Specifies the ending channel for the memory scan via two ASCII digits
54. ormat Set command lt gt Get command 2 4 lt gt Response lt gt represents the time in ASCII decimal format Value number of milliseconds Valid ranges are 0 99999999 This feature determines how long the radio will wait before checking channel activity after moving to a new frequency or channel This time is necessary to allow the AGC system to settle down so an accurate measure of channel activity can be made Factory defaults to 50ms 7 21 Disable Multi Addressing Switch Override U1 Format Set command lt gt Get command Not applicable Description This command disables the Multi addressing override mode The firmware will set clear multi addressing mode via Dip Switch SW1 switches 4 8 If all the switches are set to the ON position multi addressing is disabled and the unit will respond to all commands If the dip switches are set to any other position multi address mode is enabled and the unit will respond only to commands that have the binary address selected via the dip switches of the unit Switch 4 MSB Switch 8 LSB Enable Multi Addressing Switch Override U2 Format Set command U2 lt cr gt Get command Not applicable Description When this command is received the multi addressing mode is ignored and all the units connected on the serial or Ethernet bus assumes non multi address
55. provide all the controls and displays necessary for comprehensive control of connected RX 400A HF VHF UHF Receivers Chapter 4 provides a detailed description of control functions and steps required for receiver operation 3 7 1 Power Switch The front panel power switch is a left right toggle type where to the left is ON 1 and to the right is OFF 0 Generally the power sequence should be all RX 400A turned ON first followed by the RCU 400A 3 7 2 Tuning Knob The large main tuning knob is a shaft encoder which is used as the main frequency tuning control but also functions as a multi pot where it is used as a rotary control for most of the receiver control functions dependent on which function key has just been pressed such as RF Gain Squelch BFO etc PN 74436 3 6 3 7 3 Pushbuttons 14 pushbuttons are used for selecting various receiver control functions 3 7 4 LCD Display A large LCD is used to provide the operator with a screen presentation of the receiver functional status with all the alpha numeric information required to operate a selected receiver It has blue back lighting with a 30 second time out without control movement for night time or dark operating environments 3 7 5 Volume Control A front panel audio gain control is provided for the front phones jack 3 8 HEADPHONES JACK A 1 8 stereo headphones jack is provided on the front panel This audio is reconstructed audio that is receiver audio that has
56. s 3 1 and 3 2 for parts orientation 3 3 POWER Ensure the Power Switch is in the OFF position on The RCU 400A left side of switch depressed toward front panel 117 3 4 REAR PANEL CONNECTIONS 3 4 1 Power Cable Connect a customer furnished power cable with a female MS type 3 pin plug to the power connector on the rear of the RCU 400A Pin wiring for the cable must be identical to that listed in Table 2 3 Next plug the other end of the cable into a 90 260 VAC single phase power source 3 4 2 External Reference If an External Reference used it is connected to the RCU via a rear panel SMA connector 3 4 3 Audio Connections Balanced Line Audio is available on a rear panel 15 pin D connector where connections are made via a customer furnished mating connector and cable assembly Pin assignments are listed in Table 3 2 3 4 4 Remote Control Connection RCU interface is via two 2 connectors on the rear panel One is a RS 232 interface using the standard 9 pin D type connector The other is ETHERNET using a RJ 45 type jack The RS 232 port is used for firmware updates and the Ethernet jack is for connection to a LAN to facilitate mission downloads from a host PC or workstation Please see Chapter 7 for detailed information for data interface formats PN 74436 3 2 FIGURE 3 1 RX 400A amp RCU 400A RACK ASSEMBLY 3 4 5 Connections To RX 400A Receivers For operator manual control of receivers the RCU is connected to each rec
57. this button high lights the currently selected detection mode on the display Repeated pushes provide a scroll through all the available detection modes 4 4 4 4 Bandwidth Pushing this button high lights the currently selected IF bandwidth on the display Repeated pushes provide a scroll through all the available bandwidths Select the bandwidth that produces the cleanest audio response with minimal sideband noise PN 74436 4 4 4 5 RF Gain and Squelch Settings The RF SQL button toggles between two functions RF Gain attenuation and Squelch Level threshold The value of the selected function is adjusted up or down in 1 dB steps using the main rotary tuning knob The RF Gain is adjusted for band conditions and sets the receiver sensitivity level where 00 maximum receiver gain sensitivity and 120 maximum attenuation of the input signal Generally values between 00 and 30 will provide satisfactory performance For weak signal work signals close to the noise floor run the RF Gain at 00 When operating in a strong signal environment it is sometimes useful to crank in some attenuation to prevent receiver front end overload and possible distortion products Generally when the receiver is used to manually tune through a band with known Signal activity the Squelch is set to a level just above the noise floor 2 or 3dB so that the background noise floor is not heard in the audio just the signal of interest When searching for weak sig
58. ting of ten bits and comprised of the following e one start bit an eight bit character parity one stop bit An example illustration of the fixed data word format is shown below Bit 7 Stop It is important in serial data transmissions that the receiving device knows when data is being transferred and when data being transferred is about to stop This information is conveyed by the above start and stop bits The start bit synchronizes the receiving device so it reads the data properly The stop bit notifies the receiving device that the data frame has ended The RCU 400A s fixed data word frame format does not contain a parity bit 7 2 1 Communications Protocols Data transfers are handled via input and output buffers The input buffer is handled in circular fashion allowing simultaneous inputting and processing of data The input buffer accepts up to 256 bytes before overflowing As data in the buffer is being processed up to 16 additional characters can be accepted by the unit Upon receiving a terminator character the RCU 400A processes any previous messages in the buffer The input buffer processing starts on the receipt of a terminator CR If the communications error flag is set the buffer contents from the end of the last processed message thru the message terminator are discarded In the event the buffer is overrun its contents are discarded All other incoming data is buffered and processed in the order
59. top PC Po Front panel phones jack 1 8 and rear panel Line audio for selected receiver Connectors Ethernet LAN and 8 port Switch RJ 45 Loft Standard 9 D External SMA 1 2 5 or 10 MHz auto sense Line AUGION is reet ct rta 15 pin D ite eee tae MS type circular 3 pin keyed PN 74436 1 DEAS M3IA 401 3015 WOIdAL 25 01 RCU 400A Three View Drawing FIGURE 2 3 PN 74436 2 4 2 2 ENVIRONMENTAL CONDITIONS The RCU 400A Receiver Control Unit is a rugged design intended for commercial government and military applications The unit is specifically suitable for fixed site vehicle or shelterized installations shipboard service and cabin class turbo prop jet aircraft if appropriate shock and vibration isolation is provided The RCU 400A is a COTS product and as such is not certified to MIL STD 810 standards however the unit is designed to meet shock and vibration levels associated with procedure 514 for cabin class aircraft environments With regard to RFI EMI the RCU 400A is designed to meet although not factory tested to MIL STD 461F for CE02 CE03 501 RS02 and 5903 The RCU 400A is designed to operate under the conditions in Table 2 2 TABLE 2 2 ENVIRONMENTAL CONDITIONS Par
60. tton action is coded to reflect sequential operations for use by the Logic DSP section to form receiver command words 5 2 5 Power Supply The RCU 400A power supply delivers 12V and 5V to the Logic DSP section as well as regulated voltages required by the Ethernet Switch Ethernet interface RS 232 interface and front panel assembly The power supply is a universal design that runs from a 90 to 260VAC single phase source with a frequency between 48 440 Hz PN 74436 6 0 FIRMWARE LOAD AND UPDATE PROCEDURES 6 1 INTRODUCTION The RCU 400A Receiver Control Unit is delivered from the factory with operating firmware installed While the firmware is the latest version available at time of manufacture updates may become available at the time of Receiver installation or periodically over the life of the equipment Firmware is available for download from the TEN TEC Inc by contacting the factory 6 2 REQUIRED APPLICATION TOOLS To load firmware updates into the RCU 400A requires the TEN TEC Flash Update Utility tool This tool is available by contacting the factory Upon receipt load the utility onto the desktop screen of the laptop or PC This update utility will run on Windows 2000 XP or Vista operating systems The RCU 400A firmware updates are loaded via the RCU s RS 232 port Loading the firmware requires a Serial Driver installed in the laptop or PC being used to perform the download 6 3 FIRMWARE LOAD UPDATE STEPS To lo
61. ver gain and reducing sensitivity 7 9 Stop Ethernet Audio Rip EO This command stops the transmission of RIP Radio over IP audio via Ethernet UDP protocol Format Set command 0 lt gt Get command Not applicable Definitions Start Ethernet Audio Rip E1 This command starts the transmission of RIP audio ethernet packets This command must be sent out a minimum of every 5 seconds for the unit to continue to send rip packets via ethernet Format Set command El lt cr gt Get command Not applicable Definitions Set Ethernet IP Address E2 Format Set command E2AAA lt dot gt BBB lt dot gt CCC lt dot gt DDD lt cr gt Get command 2 lt gt Response EZAAA lt dot gt BBB lt dot gt CCC lt dot gt DDD lt cr gt Definitions AAA The 1 octet of the IP address Range 0 255 BBB The 2 octet of the IP address Range 0 255 CCC The 3 octet of the IP address Range 0 255 DDD The 4 octet of the IP address Range 0 255 The octet addresses can be specified using 1 2 or 3 digits If less than 3 digits are specified for the octet address dot character lt 0x2E gt must sent between the octets to differentiate between address values 7 10 Set Base UDP Port E3 Format Set command EINNNNN lt cr gt Get command 2 E3 lt cr gt Response ESNNNNN lt cr gt Definitions This command will set the 5 digit UDP port value for the r
62. ver will use the step size specified in that command lt H gt halts or stops frequency scanning and returns to manual mode The receiver will remain tuned to frequency it is currently set to when receiving this command P Scanning will pause scanning if currently in scan mode This command is ignored if not currently in scan mode R resumes frequency scanning if currently in paused mode Ignores this command if not currently in paused mode Frequency Step F5 Sets the step size of frequency scan 1 Hz steps in mode Format Set command FSFFFFFFFFFF cr Get command 5 lt gt Response F5FFFFFFFFFF lt cr gt Definitions FFFFFFFFFF Selects the step size in hertz entered in ASCII decimal format Leading zero s can be omitted Range 1 Hz 3 GHz 7 13 Add Lockout Frequency F6 Format Set command F6NNFFFFFFFFFF dot BBBBBB cr Get command F6NN cr Response FONNFFFFFFFFFF lt dot gt BBBBBB lt cr gt Definitions Specifies the record number where the lockout frequency is stored Valid record numbers 0 49 Note If NN value is 00 the radio will respond with all the record numbers and values that are programmed in the following format F6NNFFFFFFFFFF lt dot gt BBBBBB lt cr gt F6NNFFFFFFFFFF lt dot gt BBBBBB lt cr gt F6NNFFFFFFFFFF lt dot gt BBBBBB lt cr gt etc FFFFFFFFFF specifies the 10 digit ASCII decimal frequency value to lock out when tuning Lea

Ten-Tec RCU-400A USERS MANUAL-7-25A

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