RT-600 User Manual
Contents
1. Channel No frequency ship station Frequency coast station 156 050 MHz 160 650 MHz 156 100 MHz 160 700 MHz 156 150 MHz 160 750 MHz 156 200 MHz 160 800 MHz 156 250 MHz 160 850 MHz 156 300 MHz 160 900 MHz 156 350 MHz 160 950 MHz 156 400 MHz 156 450 MHz 156 500 MHz 156 550 MHz 156 600 MHz 13 156 650 MHz 14 156 700 MHz 15 156 750 MHz 16 156 800 MHz 17 156 850 MHz 18 156 900 MHz 161 500 MHz 19 156 950 MHz 161 550 MHz 20 157 000 MHz 161 600 MHz 21 157 050 MHz 161 650 MHz 22 157 100 MHz 161 700 MHz 23 157 150 MHz 161 750 MHz 24 157 200 MHz 161 800 MHz 25 157 250 MHz 161 850 MHz 26 157 300 MHz 161 900 MHz 27 157 350 MHz 161 950 MHz 28 157 400 MHz 162 000 MHz 156 025 MHz 160 625 MHz 61 156 075 MHz 160 675 MHz 62 156 125 MHz 160 725 MHz 63 156 175 MHz 160 775 MHz 64 156 225 MHz 160 825 MHz 65 156 275 MHz 160 875 MHz 66 156 325 MHz 160 925 MHz 67 156 375 MHz 68 156 425 MHz 69 156 475 MHz 70 156 525 MHz 156 575 MHz 156 625 MHz 156 675 MHz 156 725 MHz 156 775 MHz 156 825 MHz 156 875 MHz 156 925 MHz 161 525 MHz 156 975 MHz 161 575 MHz 157 025 MHz 157 075 MHz 161 625 MHz 161 675 MHz 157 125 MHz 157 175 MHz 161 725 MHz 161 775 MHz 157 225 MHz 161 825 MHz 157 275 MHz 161 875 MHz 157 325 MHz 161 925 MHz 157 375 MHz 161 975 MHz 157 425 MHz 45 162 025 MHz User manual Direction Finder RHOTH2. gt Data string lt of the bits 25 to 112 of the COSPAS SARSAT data burst in case of short messages and bits 25 to 144 in case of a long message format The last 8 Hex Values are separated by a blank Bit and Frame synchronization hex values Bits 1 to 24 are suppressed to increase the readability of the data message gt X lt sign to indicate that the Squelch is controlled by the antenna unit for optimum sensitivity The user has no access to the Squelch setting 21 User manual Direction Finder RHOTHETA RT 600 2 3 5 Tracking 121 500 MHz while in COSPAS SARSAT Mode While in COSPAS SARSAT DF Mode the user can switch to 121 500 MHz in order to track the beacon in VHF If a valid signal is not received in 121 500 MHz the user can switch back to the last active COSPAS SARSAT channel 406 MHz frequency being tracking previously Differences are 1 gt 406x lt press F1 to switch back to the last COSPAS SARSAT channel 406 MHz frequency being tracking previously 2 121 500 MHz Actual frequency being tracked Fig 24 Tracking 121 500 MHz while in COSPAS SARSAT Mode 22 User manual Direction Finder RHOTHETA RT 600 2 3 6 COSPAS SARSAT Scan Mode If the COSPAS SARSAT Scan Mode has been selected at the frequency selection page FRQ the COSPAS SARSAT channels as selectable manually from the Frequency Selection Page are scanned After reception of a COSPAS SARSAT Signal the scanning is stopped at the receive
3. 17 FRQ Selection Page before frequency editing 1 gt MHz lt Rotary switch for direct adjustment of the displayed MHz range inside the actual band 1 x step 1 MHz adjustment 2 gt kHz lt Rotary switch for changing the displayed kHz frequency according to the actual band frequency grid as example 8 333 kHz at the VHF airband 3 gt F2 lt Adjustment of the next available band see next page gt gt Selecting a Frequency Band If the selected and marked frequency is not one of the MEM 1 4 channels then the changed frequency is automatically stored in the work frequency WorkFRQ channel Fig 18 FRQ Selection Page after frequency editing 16 User manual Direction Finder RHOTHETA RT 600 2 2 5 Selecting a Frequency Band While on the FRQ Selection Page each available band can be selected by pressing F2 BAND 1 Press push button F2 BAND for switch over to the next band 2 Designation of actual selected band 3 Max frequency limits of the actual selected band depends on wide band options Fig 19 FRQ Selection Page bands Frequency bands availability depends on the system version A LE and its wide band options F1 to F4 These optional wide bands are available if ordered in addition to the default bands Here is a listing of DEFAULT and OPTIONAL bands available with each version of the system RT 600 STANDARD Listing of bands Default bands available OPTIONAL extended bands availa
4. X Permission RL Calibration Line Night Line NVG Dimming External Autosquelch Active O Standard Version 1 LE Version Status 2 HSB x x x x x x x x LSB O Standard l extended serial dataprotocol ON active 4 5 Error Bits 12 0 8 11 Frequency 16 Voltage DCU 0 335 33 5 5 9 Voltage AU 0 255 295 27 Level 0 100 28 29 Bearing Averaged 0 359 rel 30 31 Bearing Live Min 0 359 relati 32 33 Bearing Live Max 0 359 relati Test Value PS RAM Right Rotation 0 178 for service onl Test Value PS RAM Left Rotation for service onl Not used reserved 38 Checksum is the 2 s complement of the modulo 256 sum of all bytes without checksum byte 0 n 47 User manual Direction Finder RHOTHETA RT 600 Detailed Description of important values for practical use e Status byte 2 Receiving Bit O of this value LSB indicates signal receiving Bit O 0 then no signal is received and so on no bearing is available Bit O 1 then bearing is possible Bit 1 if 1 then Squelch is controlled by AU active at modes CospasSarsat Decode CospasSarsat scanning LoJack with Filter ID only e Error bytes 4 5 gt 16 bit value each set bit corresponds to the error no Refer to the chapter Error messages Example 0x0000 gt No error 0x0800 gt Bit No 11 Set No AU Error e Actual DCU Page byte 6 indicates ac
5. averaging The relative live bearing reacts faster than the normal relative bearing but it has not the precision of the averaged bearing The Min Max Bearing Values are calculated within a time period of approx 250 ms If they are very close together for example 124 and 128 degrees then the signal quality is quite good A wide span of the min max values for example 97 and 162 shows very noisy but nevertheless bearable signal quality 48 User manual Direction Finder RHOTHETA RT 600 6 3 3 DCU Info output protocol description Specification DCU Info output Remark This protocol is only available while the Setup Edit page is activated at the DCU byte no Header OxAF Id for DCU Info Mode Number 39 bytes in the complete message including header and checksumbyte see standard output Info String of 15 bytes chars the string contains Information about Unit Variant Software Version and Serial No Example Byte 3 AU ID Var Software Version Serial No 0x44 0x55 0x41 0x33 Ox2E 0x33 0x30 0x3A 0x20 0x20 0x30 0x31 0x32 0x33 0x34 0x00 D y INT PIRN Brk E Lit fe 1 1 1 1 Lit A Fr TRN EA END N n nn nnnnn tware Version Serial No tandard Variant Law Enforcement Variant 49 User manual Direction Finder RHOTHETA RT 600 6 3 4 Optional extended serial output protocol descri
6. max length of cable 20 m 38 User manual Direction Finder RHOTHETA RT 600 5 Technical Data 5 1 Electric features Method of bearing Doppler principle 3 kHz rotational frequency right left rotation Bearing accuracy 5 RMS Internal resolution i Bearing Sensitivity VHF Air Emergency lt 2 5 uV m VHF Marine lt 2 5 uV m UHF Emergency and ETS lt 4 uV m COSPAS SARSAT lt 4 uV m LoJack Decoding 50 Message Error Rate and bearing lt 5 uV m typical typical typical typical typical Frequency stability 2 0 ppm Af f 2 10 Reception frequencies VHF Emergency Band 118 000 to 124 000 MHz 8 33 kHz steps AM SAR version VHF Marine Band 154 000 to 163 000 MHz 5 00 kHz steps FM Standard channel 16 selectable via channel no UHF Emergency Band 240 000 to 246 000 MHz 25 00 kHz steps AM UHF FM Band 406 100 to 410 000 MHz 5 00 kHz steps FM COSPAS SARSAT 400 000 to 406 092 MHz Including 406 022 to 406 076 MHz Channel A S Frequency Options F1 VHF Air Band 118 000 to 136 992 MHz F2 extended VHF Marine Band 137 000 to 224 995 MHz F3 extended UHF Air Band 225 000 to 399 975 MHz F4 additional UHF FM Band 406 100 to 470 000 MHz Reception frequencies VHF Emergency Band 118 000 to 124 000 MHz 8 33 kHz steps AM LAW Enforcement VHF Marine Band 154 000 to 163 000 MHz 5 00 kHz steps FM version channel 16 selectable via channel no L
7. menu below the button by pushing it for a short time here as example SCAN starts scanning the actual air band gt STORE lt push button Without function except if a special function is high lighted in the menu line of the display gt REPEAT lt Push button when pressed and hold for min 3 sec the last valid bearing value with corresponding receiving level is displayed 2 3 2 Standard Display in DF Mode 1 2 3 4 5 Fig 21 DF Mode gt Relative Bearing value lt by means of a sophisticated averaging procedure a steady display is accomplished as graphic display and as text in the range of 0 359 0 corresponds to bearing direct ahead gt Spread lt maximum deviation of un averaged bearing values This is an indicator of bearing quality The wider the range between the directions of maximum deviation the worse the received signal is As a result of the excellent averaging procedure even with a spread of 45 good bearing results are achieved gt Receiving level lt field strength of the signal as a relative percentage value visualized as bar graph indication and as decimal value Even without a received signal a certain noise level may be displayed gt Squelch level lt independently adjustable and stored for each frequency band Squelch level is indicated as marker at the Signal Strength Bar Graph or as direct relative level value A usable bearing analysis can only be achieved
8. this sensor is interfered by strong turbulences The direction finder antenna unit acts as a sensor for electromagnetic waves In the near field of this antenna unit any conductive e g metallic obstacle will influence the incoming wave field and create reflections which decrease the bearing accuracy These are general physical limitations concerning all types of direction finder systems To achieve the best bearing results it should be considered that the antenna unit is installed as far away as possible from any other vertically polarized conductive structure If possible there should be no reflectors within an area of 2 3 feet around the antenna unit In this worst case example the direction finder will not work properly Fig 44 Antenna Installed in a Bad Location In this example the antenna unit is located too close to the cable cutter of the helicopter This cutter will produce strong reflections especially as the length is equal to Lambda 4 within the VHF airband 35 User manual Direction Finder RHOTHETA RT 600 Examples of properly installed direction finder antenna units Fig 45 Antenna Installed in Good Locations 36 User manual Direction Finder RHOTHETA RT 600 4 2 Display and Control Unit The display control unit may be mounted into a front panel by the means of this mounting drawing Fig 46 DCU Mounting Drawing all dimensions in mm To install or uninstall the display control unit pe
9. to the operating setup menu description 11 User manual Direction Finder RHOTHETA RT 600 2 1 5 Squelch Operation The main challenge of operating a direction finder is trying to use only the signal transmitted by the target in order to calculate its bearing accurately because noise and RF disturbances will cause misleading bearing indications In order to prevent the direction finder to calculate bearing results which are due to noise and disturbances several techniques are available If a signal can be distinguished from noise or other signals by its message content e g LoJack ID only transmissions containing the required message content are used for bearing In other cases the squelch can be used to suppress unwanted weak signals and noise A squelch level called threshold has to be set by the user or automatically by the system All signals with strength below this threshold value will be ignored while signals with strength above this level will cause a bearing indication So for a signal to be usable for bearing calculation it has to be sufficiently stronger than noise or disturbing signals that the receiver can clearly distinguish between wanted and unwanted signals As a result of the squelch technique the receiver sensitivity is reduced to the level set by the squelch threshold decreasing the maximum distance or range to the transmitter However it might be desirable to obtain bearing information even for weak signals wh
10. 00 246000000 Hz 8 333 ki al 218995 220000 400000000 410000000 Hz 8 333 ki 00000 410000000 9 Squelchlevel Manual 0 60 Autosgl 1 Warning use only for pulsed signals as example CpSarsat LoJack 10 not used for normal operation any byte values allowed 11 Internal Dimming 0 100 Checksum is the 2 s complement of the modulo 256 sum of all bytes without checksum byte 0 n 1 52
11. 4 A O E 34 4 1 1 Influence of antenna location and environment on the bearing accuracy cccccooccnccccccnncnnnnnncnnnnnnos 35 4 2 Display and Control Uso T 37 4 3 System Interconnect Wiring Diagram coccconcnnccconnnccconnncoconcnnononononnonnnnononnnnononnnnnnnnnnnnannnnonannnnenenananess 38 S TECHNICAL DATA 00 acacia 39 SM Een OaE mae AP ue ere era ee eee ee erent eee 39 DZ MENACE ERREUR DUE 41 9 9 Mechanical Teil aiii ca 42 User manual Direction Finder RHOTHETA RT 600 6 APPENDI cout da a 44 Gals Frequency Ranes RR 44 6 2 Frequencies of channels on maritime Dand occccocnccccnnnoccnnnoconnnononnncnnnonnnnnonanononnnnnonannnnnnnnonannnnonaninnas 45 6 3 Serial interface data protocol short description occcoonccncoconcnnoconnnncnnonononnnconononcnnnnnarnnonnanennnnannnnonnns 46 DST GENEI ERE 46 6 3 2 Serial standard output protocol descriptiON oocccoccnccoccnccccnncconnnonononononnnonnnnnnnnnnnnnnnonononenononos 4T 6 3 3 DCU Info output protocol description coooccccoccnncocnnccccnnncnnnncnonononnnnononononnnnnnnnnnononnnononnnonononos 49 6 3 4 Optional extended serial output protocol descriptiON ooccccconccncoconnnncnoncnnconanononanennononennnnnos 50 6 3 5 Optional serial input protocol description ooccccocnnccoccncconcnccononoconnnnonnnonanononnnnonon
12. E with adjusted LoJack frequency the user can switch directly to the LoJack Scan by pressing gt F1 lt SCAN 1 press F1 SCAN to switch to the LoJack Scan page 2 still no LoJack ID filter used ID off gt all transmissions are received on the active frequency as example also unwanted tower pulses Fig 33 DF Mode with LoJack filter OFF 27 User manual Direction Finder RHOTHETA RT 600 2 4 5 Receiving and accepting a new VLU Code While in LoJack Scan Mode waiting for a VLU Code if a new VLU Code is displayed the user can accept it and switch directly to DF Mode by pressing F2 1 a new LoJack VLU Code 00014 has been received 2 press F2 to accept the new VLU Code 0001A and switch to DF MODE page with the LoJack filter activated to track only 0001A Fig 34 LoJack Scan Mode with new VLU Code received 2 4 6 Entering a new VLU Code manually While in LoJack Scan Mode the user can enter a LoJack VLU code also manually 1 2 3 use the SELECT and VALUE knobs to enter a new LoJack VLU Code active ID 0001A 4 Press F1 to accept the new VLU Code and switch to DF Mode with the LoJack filter ON to track only 0001A RHOTHETA SAR DF 517 ON OFF RT 600 DCU y i Fig 35 LoJack Scan Mode with new VLU Code entered manually 28 User manual Direction Finder RHOTHETA RT 600 2 4 7 Tracking one VLU Code while monitoring new VLU Codes While on DF Mode and tracking a VLU Code 0001A the us
13. ETA RT 600 6 3 Serial interface data protocol short description 6 3 1 General Interface parameters RS232 9600 Baud 8 databits 1 stopbit no parity LSB sent first Timing of serial data For accurate use of the serial data even for the optional serial input commands the correct timing is mandatory The DCU Display Control Unit sends out via the RS 232 Pins see 4 3 System Interconnect Wiring Diagram page 38 cyclic and autonomous every approx 250 300 ms a binary data stream which contains all relevant DF bearing information The output data contains one or two blocks of binary data see next picture with accordingly description The optional serial input is only used if changes as example frequency change are done by additional remote control units Cycle time approx 250 300 ms Serial standard output ireak Optional extended serial output Optional serial input 39 databytes mode dependent approx 13 databrytes i approx 40 ma approx 5 ma 10 33 ma max SO ms Fig 50 Timing of serial data Serial standard output This output data is always available and contains all relevant DF bearing data For detailed content see page 47 Optional extended serial output This data contains some additional information like as example CospasSarsat or LoJack decoding and ID data For detailed content see page 50 The data is only available with DCU Software Rev gt 3 20 and if this optional data block is con
14. IX Selection range for fixed frequencies FIX1 for RT 600 Standard version Elt Plb 121 500 MHz international VHF air distress emergency frequency FIX2 Chnl 16 156 800 MHz marine VHF emergency radio channel 16 FIX3 Elt MIL 243 000 MHz military UHF air distress emergency frequency FRQ Selection Page with FIX1 selected for RT 600 Law Enforcement version FIX1 Elt Plb 121 500 MHz international VHF air distress emergency frequency FIX2 Chnl 16 156 800 MHz marine VHF emergency radio channel 16 FIX3 LE USA 173 xxx MHz LoJack Recovery System FIX4 ETS STD 216 487 MHz ETS standard frequency FIX5 ETS UCV 216 512 MHz ETS u cover frequency 2 CPSAR Selection range for Cospas Sarsat channel groups CPSAR1 CPSAR2 CPSAR3 CPSAR4 CPSAR5 CPSAR6 CPSAR7 022 028 031 037 040 043 046 052 055 061 064 070 073 076 406 022 406 031 406 040 406 046 406 055 406 064 406 073 028 MHz 037 MHz 043 MHz 052 MHz 061 MHz 070 MHz 076 MHz 15 Channel A B C Channel D E F Channel G H Channel J K Channel L M N Channel O P Q Channel R S User manual Direction Finder RHOTHETA RT 600 2 2 4 Editing a Frequency While on the FRQ SELECTION Page the user can directly edit the frequency displayed RHOTHETA SAR DF T7 Ww er ON OFF eee E 4 j 1 if Fig
15. OPERA ING seri a a aE aa aaa dca eerGriay se 8 2 1 General Operating PANCIDIES oa at AAA E AS 8 2 1 1 Push buttons with double TUNC ION ooocccococonccconnnccconnncnonocononnanncononnnnonnnnnnnnnannnnnnonnnnononnnnnnnnnos 9 21 2 P9Werdon Procedure sica 10 2123 Man Pages ele clon tt At 11 E A cot eeeee te ee tesa tops tine et sud iD eee 11 Zo QUe lc Operatoria 12 2 2 Frequency FRQ Selection Page occcococcccccococonccconnonoconononnononnnnannncononnnnnnnnnnnnnnnnnnnnannnennnnnnennnnnnnnnannss 14 22 41 SOlSCcUnO a pretia e NU cR 14 2 2 2 Recalling and editing frequencies from a memory Chanel oooccccoccnnccccccnconoccnnonnncnnonnncnnnnnncnnonanons 14 2 2 3 Recalling frequencies from fixed frequencies or CospasSarsat Channels 15 2 2 4 Eang a Frequency ana ad dos 16 2 2 5 Selecting a Frequency BANd oooccccccccnoccccononcconcnocnnonononnnnnnnnnnnnnnonannnnnnnnnnnnnnnnnnnonannnnnnnnnnnnnannnenenons 17 2 9 Direction Finder DE MOG sioe ai ot ce aa leida colo 18 2 3 1 Operating Elements in DF Mode sssssssssesssssseeeenenne nennen nennen nnne nnne nn nnne nns 18 2 3 2 Standard Display in DF Mode sesssesssssssssssssseee nnne nennen nennen nnne nnns nan nnne nnne nnns 19 2 3 3 Special Options in COSPAS SARSAT DF Mode o cooccccoccnccoccnccoccnococcnnncnnonncnnnoncnonnnnnononnnonnnnnnoncnnnos 20 2 3 4 COSPAS SARSAT Decode Window sees
16. SPAS SARSAT or LoJack DECODE transmitter lt DF defective Error 1 Incompatibility of Protocol data bytes out of valid range DATARNG data DCU AU Error 0 Antenna Unit Receiver board defective NO REC receiver 33 User manual Direction Finder RHOTHETA RT 600 4 Installation 4 1 Antenna unit A convenient position of the monopole bearing antenna is crucial for good bearing results The antenna needs an effective ground connection to the body of the aircraft or to the roof of the vehicle If there is no metallic mounting surface available a metallic sheet or similar net with connection to ground has to be applied first between vehicle body and antenna In this hatched area the antenna touches the body of the vehicle aircraft In order to obtain a good ground 8 x holes for mounting the connection the surface of the body should be bared antenna unit to the Measuring unit mm vehicle aircraft oS 2 COO SS ISO SOS BRR YT PIA Fig 43 Antenna Mounting Drawing 24 User manual Direction Finder RHOTHETA RT 600 4 1 1 Influence of antenna location and environment on the bearing accuracy Recommendations concerning the practical antenna unit location on helicopters and airplanes The bearing accuracy of the direction finder antenna unit is severely influenced comparable to an airspeed sensor by the environment For comparison a perfect high quality speed sensor will not indicate the true airspeed if
17. Temperature inside Antenna Unit valid range 50 100 C signed byte value The following databytes are only available if a correct CP Sarsat puls gets received and decoded with correct checksum 18 x Databytes complete orginal CP Sarsat 406 decoded message 144 bit 7 24 Databyte Nr Byte 7 I Byte 8 Byte9 Byte24 406 MSG Bit Nr 1 2 34 5 6 7 8 9 10 11 12 13 14 15 16 17 144 S N Flag li 0x53 S Ox4E N 0x2D if no GPS data avail 0 90 decimal Deg OxFF if no GPS data avail GPS Position Latitude 0 59 decimal OxFF if no GPS da 0 59 decimal Deg OxFF if no GPS data avail 0Ox57 2 W Ox45 E Ox2D 2 if no GPS data 0 180 decimal Deg OxFF if no GPS data avail GPS Position Longitude 0 59 decimal OxFF if no GPS dat 0 59 decimal Deg OxFF if no GPS data avail 50 LoJack User manual Direction Finder RHOTHETA RT 600 ID data This data is only available and valid if Valid Lo Byte No 1 Display Control Unit with actual software Rev gt 3 20 see Power On procedure page 10 Direction Finder of variant L Law Enforcement Configuration of Extended serial ON see Setup Edit Page point 10 Direction Finder is working with active LoJack gt ID Filter lt Header byte 0 of data 0x93
18. The weaker a signal is the longer it will take to change the bearing Durations around 5 seconds are not unfamiliar in such cases Therefore it is not useful to use this procedure for signals with short transmission times and low transmit duty cycles such as COSPAS SARSAT transmission The procedure is best suited for ELT transmission with a continuous signal and still well suited for ELTs with intermittent transmission down to 33 In cases where pulsed signals are to be received the receiver is able to decide automatically which squelch level is best suited for normal operation In such cases an automatic A squelch is provided The threshold is automatically set to a value higher than the calculated noise level The difference in dB between noise and threshold level can be defined in the Setup Menu Refer to the chapter Setup Page for details During AUTO squelch operation the user has the possibility to force the squelch into MANUAL mode but needs to be aware of the operational limitations described in this chapter In cases where the Antenna Unit checks signal validity autonomously and without useful possibilities of user interaction user interaction is not possible and the squelch purely follows internal rules appropriate to the type of signal received PD User manual Direction Finder RHOTHETA RT 600 Examples of different squelch settings a b Correct squelch adjustment If the squelch is set to level b slightly o
19. User Manual Installation and Operation Wideband Airborne Radio Direction Finder RT 600 SAR DE 517 e Standard Version e Law Enforcement Version DIO Elektronik GmbH I H F I A User manual Direction Finder RHOTHETA RT 600 Edited by RHOTHETA Elektronik GmbH Dr Ingeborg Haeckel Str 2 82418 Murnau Germany Tel 49 8841 4879 0 Fax 49 8841 4879 15 Internet www rhotheta de E Mail email rhotheta de Copyright RHOTHETA Elektronik GmbH All rights reserved RT 600 User Manual Installation and Operating PN HT 8699 Issue 2013 09 25 Rev 3 02 e Edition valid for DCU with Software Rev 2 3 30 e Edition valid for AU with Software Rev 2 3 30 LoJack is a registered trademark of LoJack Corporation Note The manufacturer reserves the right on making modifications of the product described herein at any time and without previous information User manual Direction Finder RHOTHETA RT 600 Index T GENERALINFORMATION unicidad 6 1 1 Purpose of use of the direction finder oocccccccncoccnncoccnnccocnnnconnnonanononanononnnnononnnonannnonnnnonannnnnonnnenananenas 6 Are O oro lo 2 NYLON 7 ME ES E A ere te eee ne ee rece ee 7 122 IR OOO ANVG PN RT I i a A Recess T PA INR PN R TO A ERE T 1 234 RISOO LE NVG TENERTE ERN T 1 3 Main system configuration SettingS oooccccocnncnnoccnnnconanonnonononnnnoncnnnnnnrnnnonnnrnnnnnnrnnnnnrnnnonnnrnnnnnnnrnnnnnaninns T 2
20. a frequency Open FRQ Page From the DF standard page activate the Page Rotary Switch in any direction to open the FRQ Page for Frequency Selection Store Rep 9 F2 xDiM Yes Fig 14 FRQ Frequency Selection Page Fig 13 Open FRQ Page 2 2 1 Selecting a Frequency 1 Use the Page knob lt FRQ gt again to select recall a frequency from gt MEM lt four 4 memory channels gt W lt one 1 working operating frequency gt FIX lt fixed frequencies gt CPSAR lt seven 7 COSPAS SARSAT channel groups 2 The actual adjusted frequency 3 Frequency band information Exit Frequency dialogue 4 Press push button gt F1 lt EXIT to exit to DF mode using the actual frequency 2 2 2 Recalling and editing frequencies from a memory channel Recall 1 With changing the Page rotary knob memory AN symbol indicates the actual memory channel dt EPA Edit 2 MHz x edits the MHz Value of the actual frequency 3 kHz edits the kHz Value of the actual frequency 4 F2 switches to next band gt MHz lt and gt kHz lt directly changes and overwrites J C the actual selected memory frequency inside the Y o P actual band see also 2 2 4 Editing a Frequency Fig 15 Recall frequency of Memory channel 3 14 User manual Direction Finder RHOTHETA RT 600 2 2 3 Recalling frequencies from fixed frequencies or CospasSarsat Channels Fig 16 1 F
21. active page 2 The active page is highlighted with dark background 3 The inactive page which may be selected is displayed in dark letters on bright background Fig 6 Page Selection 2 1 4 Dimming function The background of the LC graphic display is equipped with an LED array and its brightness may be adjusted continuously from 5 to 100 Dimming follows an exponential curve resulting in very accurate adjustment under night conditions 1 Pressing the Rep DIM button for a short time activates the DIMMING mode 2 Brightness actual information in percentage from 5 to 100 in 5 steps is displayed instead of the Page field in the upper t right corner of the display ois 3 The gt Page lt knob is used to adjust the brightness in 5 steps left and right The active brightness level of the display will remain stored after switching off the unit separately for day and night NVG mode Fig 7 Dimming Adjustment After ca 3 sec of inactivity the display will fall back to the prior main page Dimming of legends can be adjusted in two ways Internal dimming of legends Internal dimming is always active If an external dimming voltage is not used or is 1V DC legends are dimmed in the same manner as the LC display External remote dimming of legends If the external dimming voltage is gt 1V DC the brightness of the legends is controlled by the external dimming voltage Refer to the wiring plan and
22. an function seseeenm Hmm 24 DF Mode active scanning in process 2lseeesseeeseeeeeeeeee nennen nenne nenne nnn nnne nnn nn nnn anna 24 STARTUP Screen see 2 1 1 for detailS ooccccoconnococonnonccoonnncocannncnnannnnononnncnnannncnnnnnnnnnnns 25 LoJack Scan Mode unit is scanning for a LoJack VLU Code ooccccoccnccccncccccncccccnononcnocononcnnnnnnns 25 mieu p A nO neahaas Sossdahade ganda a a hase anvednen aca eaeekads 26 FRQ Selection Page FRQ LoJack BAND LoJack 164 174 MHZ oooccccccoccncccocccnconoconcnnonos 27 DF Mode with Lodack filter OFF ti ba 27 LoJack Scan Mode with new VLU Code received ooccoocccccccccccccnoccncononcnnononcnnonnnccononennnnnncnnnonanenoos 28 LoJack Scan Mode with new VLU Code entered manually ccocooccncccoccnncoccnncnoncnncnnanonoos 28 DF Mode with active VLU Code and LoJack filter ON oooccccocccncococconoconconononconnonconononcnnnonanonoos 29 DF Mode with active VLU Code and announcement of new VLU Code ssssss 29 LoJack Scan Page with one active VLU Code and one new VLU Code 30 LoJack Scan Page with one active VLU Code and audio OFF oocccccccccnccnnccncnnccncnononononononcnnnnnnns 30 Accessing TRE Setup Pages is 31 vides A o E OE OO scape E a aoaed nua comanieaceae a 32 IOP IVICSSAO c Te ld 33 Antenna Mouri rg DraWwiGia
23. and it is typically mounted on aircraft both manned and unmanned The RT 600 is a modern precision direction finder intended for professional SAR search and rescue and LE Law Enforcement purposes and there are two versions of the RT 600 e The STANDARD or A version receives and locates signals on all international VHF UHF emergency frequencies including marine channel 16 and all COSPAS SARSAT channels e he LAW ENFORCEMENT or LE version receives and locates special signals tracked by law enforcement and special ops organizations but it also receives and locates signals on international VHF emergency frequencies including marine channel 16 and all COSPAS SARSAT channels The excellent performance of the RT 600 is possible due to our revolutionary patented antenna small robust and wideband and it s sophisticated bearing analyzing algorithms which deliver quick and steady information The RT 600 was designed for usage in harsh conditions mounted on aircraft or vehicles User manual Direction Finder RHOTHETA RT 600 1 2 Scope of delivery 1 2 1 RT 600 A PN RT 8610 Display Control Unit RT 600 DCU A PN RT 8605 Antenna Unit RT 600 AU A PN RT 8602 Connector Kit PN RT 8503 User Manual PN RT 8699 Cable AU DCU PN RT 28146 OPTIONAL 1 2 2 RT 600 A NVG PN RT 8611 Display Control Unit RT 600 DCU A N PN RT 8606 Antenna Unit RT 600 AU A PN RT 8602 e Connector Kit PN RT 8503
24. ble Band designation Frequency limits Option Designation Frequency limits VHF Emergency Band 118 000 124 000 F1 VHF Air Band 118 000 136 992 MHz VHF Marine Band 000 163 000 F2 Extended VHF Marine 137 000 224 995 MHz UHF Emergency Band 000 246 000 F3 UHF Air Band 225 000 399 975 MHz COSPAS SARSAT 000 406 092 UHF FM Band 100 410 000 Additional UHF FM 406 100 470 000 MHz RT 600 Law Enforcement Listing of bands Default bands available OPTIONAL extended bands available Band designation Frequency limits Option Designation Frequency limits VHF Emergency Band 118 000 124 000 F1 VHF Air Band 118 000 136 992 MHz VHF Marine Band 154 000 163 000 F2 Extended VHF Marine 137 000 163 000 MHz LoJack 164 000 174 000 ETS 216 000 220 000 COSPAS SARSAT 400 000 406 092 217 User manual Direction Finder RHOTHETA RT 600 2 3 Direction Finder DF Mode Direction Finder DF mode is generally used to display all valid information processed by the DF from the signal received from a target transmitter The amount and kind of information displayed by the DCU depends on the type and content of the signal received and processed by the DF Simple signals such as the analog sweep tone modulation received from a SAR beacon ELT PLB EPIRB PDD on 121 500 MHz allow displaying only basic bearing information while digital signals such as COSPAS SARSAT and LOJACK allow displaying more i
25. cking function of one LoJack VLU Code The LoJack scan page can also be used to block one unwanted LoJack VLU ID signal by separating the adjusted active ID from any other received LoJack VLU signal This is done by muting the audio see example below when a LoJack signal with VLU code 0001A is received gt gt Any new VLU Code active LoJack signal except for 0001A will be displayed on the top row and generate the audible beep tone Clr Store Z FN F2 blinking Fig 39 LoJack Scan Page with one active VLU Code and audio OFF Tip Blocking is an important tool for practical missions e As example a stolen vehicle with VLU ID 0001A was tracked in the DF bearing mode The mission is completed but the VLU is normally still transmitting With the settings above only new VLU signals except the now unwanted 0001A are audible and displayed in the upper scan LoJack for new VLU box 30 User manual Direction Finder RHOTHETA RT 600 2 4 11 Tracking in the 216 to 220 MHz band The RT 600 features scanning and bearing functionality in the 216 000 MHz to 220 000 MHz band The 216 000 MHz 220 000 MHz band contains frequencies and signals used by special services and tracked by law enforcement special ops and similar organizations These are some of the frequencies and services in this band e CFR 90 259 tx 216 000 MHz to 220 000 MHz e Low Power Radio Service LPRS tx 216 000 MHz t
26. d frequency Due to the fast scanning the complete COSPAS SARSAT sub band is scanned within less than 400 ms detection of a receivable COSPAS SARSAT signal is possible within one COSPAS SARSAT repetition cycle sf e P 9 v DIM Yea Fig 25 FRQ Selection Page with SCN COSPAS SAHSAT Scan Page selected At the frequency selection page an active COSPAS SARSAT scanning can be stopped by de activating it with the rotary button 1 While the scanning is active it is also possible by pressing gt F1 lt EXIT to switch back to the DF page Fig 26 DF page with active COSPAS SARSAT Scan Mode at the DF page 1 SCAN flashing indication notifying the user that the equipment is operating in scan mode 2 Frequency display indicating the COSPAS SARSAT scanning frequency range 3 gt X lt sign showing that squelch settings are controlled autonomously by the receiver Scan mode can be left by pressing gt F1 lt STOP 23 User manual Direction Finder RHOTHETA RT 600 2 3 7 Marine Ship Scan Mode Fig 27 DF Mode FRQ 156 800 MHz F1 for scan function If the active frequency 2 is within the VHF Marine Band a fast scan of all ship channels is possible by pushing gt F1 lt SCAN 1 In this scanning mode all marine channels 1 to 88 156 025 to 157 450 MHz are scanned continuously until a signal is received To offer the best monitoring functionality for the user also signals between to channels 4 are det
27. e User Manual PN RT 8699 e Cable AU DCU PN RT 28146 OPTIONAL n AU Antsnna Unit 1 2 3 RT 600 LE PN RT 8620 Display Control Unit RT 600 DCU L PN RT 8622 Antenna Unit RT 600 AU L PN RT 8621 Connector Kit PN RT 8503 User Manual PN RT 8699 Cable AU DCU PN RT 28146 OPTIONAL DCU Display Contral Unit 1 2 4 RT 600 LE NVG PN RT 8623 Display Control Unit RT 600 DCU L N PN RT 8624 Antenna Unit RT 600 AU L PN RT 8621 Fig 1 RT 600 Airborne Direction Finder System Connector Kit PN RT 8503 User Manual PN RT 8699 Cable AU DCU PN RT 28146 OPTIONAL 1 3 Main system configuration settings To guarantee a correct configuration and performance the user should verify and change if necessary the following configuration settings e MOUNTING TOP BOTTOM this parameter indicates if the Antenna Unit is mounted on a TOP or BOTTOM position e EXTERNAL DIMMING MIN MAX if an external voltage is used for dimming the legends the MAX and MIN parameters set respectively the low and high limits of the external analog voltage connected to Pin 8 of the RT 600 DCU Power Supply connector The above settings are available in the SETUP menu For a detailed description see 2 5 Setup Edit Page on Pg 31 User manual Direction Finder RHOTHETA RT 600 2 Operating Operating the RT 600 direction finder is intentionally simple due to its intuitive human machine interface All operational setti
28. e of temperature dark blue display on yellow green background background light Freely adjustable exponential dimming of brightness NVG cockpit design Fully compatible NVIS Green B display Control Unit optional Operating voltage 27 5 V nominal 12 V to 35 V DC Current consumption LCD background light Off max 500 mA 12 V DC max 250 mA 24 V DC LCD background light 100 96 max 750 mA 12 V DC 350 mA 24 V DC L CD background light 100 max 900 mA 12 V DC with NVG Option 400 mA 24 V DC Audio out For external speaker approx 2 W 4 Q Serial data interface Serial interface RS 232 9600 baud 8 data bits 1 stop bit no parity Very weak signals can considerably increase the time of response 40 User manual Direction Finder RHOTHETA RT 600 5 2 Interface External connections optional at Sub D 9 pol Male connector Dimming Analog input signal for variable control of the legends illumination Input voltage range is freely adjustable in the range of 1 5 28 V in the legends setup menu Refer to chapter Setup Page Default setting 8 28 V 8 V Off 28 V max dimming for legends optional external voltage input for variable dimming of Input Impedance gt 50 kQ Low active as example switch to ground night status line for LCD At input voltage 2 5 Vpc the LCD dimming operates in night NVG T mode Maximum brightness ca 4 of day default mode brightness d
29. echanical Drawing all dimensions in mm For temperatures lower than 10 C a warm up period of 15 min should be allowed 42 User manual Direction Finder RHOTHETA RT 600 eil e oo OO aft ms Y Y T MEME NN Po y AZT IZ SS ATA Y22 os vr COTE f i f T NMa au A e a a a M I I a a ll a la a al AAAA nz A i Fig 49 AU Mechanical Drawing all dimensions in mm 43 User manual Direction Finder RHOTHETA RT 600 6 Appendix 6 1 Frequency Ranges SAR version Standard E B e E 4 B ES Option F1 Option F2 Option F3 Option F4 VHF Air Band extended VHF Marine Band Bl UHF Air Band additional UHF FM Band RT 600 A FM f 0 kHz 118 000 136 992MHz 137 000 224 995 MHz 225 000 399 975 MHz Bi 406 100 470 000 MHz 100 200 300 400 Frequency MHz A Standard Frequency Ranges Q9 Optional Extended Ranges LAW Enforcement version RT 600 L Option F1 Option F2 VHF Air Band extended VHF Marine Band FM 5 0 kHz 118 000 136 992 MHz 137 000 163 000 MHz 100 200 300 400 Frequency MHz A Standard Frequency Ranges Q9 Optional Extended Ranges 44 User manual Direction Finder RHOTHETA RT 600 6 2 Frequencies of channels on maritime band only for standard A version Frequency range of the RT 600 in the maritime band 156 000 MHz 162 025 MHz
30. ected scanning without gap In order to prevent the scan to stop on noisy frequencies it is recommended to start scanning with high squelch settings You can reduce the squelch level in steps until the scan stops on a noisy frequency for the first time Then increase the squelch level slightly This will result in the highest possible scan sensitivity and avoiding noisy channels due to RF disturbances sometimes generated by other equipment in own aircraft Fig 28 DF Mode active scanning in process The scanning is stopped by pressing gt F1 lt STOP 3 24 User manual Direction Finder RHOTHETA RT 600 2 4 Law Enforcement Operation Law enforcement special ops and other organizations use the RT 600 LE LAW ENFORCEMENT version instead of the RT 600 A STANDARD version One of the reasons is that the LE version features scanning and tracking of signals like LoJack and ETS as well as signals in the 216 000 MHz 220 000 MHz band such as medical beacons wrist ankle transmitters cash asset recovery tags etc However the LE version shares many functions in common with the A version such as scanning and tracking in the AIR band COSPAS SARSAT band etc 2 4 1 Power On procedure The power on procedure is the same as described in 2 1 1 1 System Version L for LAW ENFORCEMENT version a N RHOTHETA SAR DF 517 73e gt sui x ON OFF RT 600 DCU y Fig 29 STARTUP Screen see 2 1 1 for deta
31. ects pages DF and FRQ Page DF for direction finder standard bearing operation Page FRQ for changing active frequency Also adjusts display brightness if used during DIMMING mode User manual Direction Finder RHOTHETA RT 600 2 1 1 Push buttons with double function The three push buttons 1 2 and 3 can be used with two different effects 1 2 3 1 2 3 Keypress for short time lt 1 sec gt F1 lt Push button If pushed for a short time this button activates the function F1 described in the interactive menu on the display below which depends on the active mode and settings gt F2 lt Push Button If pushed for a short time this button activates the function F2 described in the interactive menu on the display below which also depends on mode and settings gt DIM lt Push Button If pushed for a short time it activates the display DIMMING mode see 2 1 4 Dimming function Fig 3 Push buttons short time keypress Keypress for longer time gt 2 sec gt CLR lt Push button If pushed for a longer time this button activates the CLEAR function gt STORE lt and special key button If pushed for a longer time and when using the RT 600 LE LAW ENFORCEMENT version then the LoJack standard Scan page with all necessary settings is activated fast switchover otherwise the Store functionality is only available at the Setup Page see 2 5 Setup Ed
32. er can turn the LoJack switch OFF with F2 also the user can start scanning all VLUs again with F1 e 0001A is displayed as the active VLU Code filter function is ON only 0001A is tracked e Monitoring of other VLU Codes is active in the background 1 Press F1 to switch to the LoJack Scan Mode to scan for new VLU Codes 2 Press F2 to switch LoJack filter OFF EEE EY SCA uiuis sii ete E B blinkin g Fig 36 DF Mode with active VLU Code and LoJack filter ON 2 4 8 Tracking one VLU Code and receiving a new VLU Code While on DF MODE page and tracking VLU Code 00014 in the background a new VLU Code is received and decoded G2HC7 1 The new VLU Code is announced NEW G2HC7 2 Press F1 to switch to LoJack Scan Mode to see the arrival time of G2HC7 and the possibility to change bearing to this new G2HC7 G2HCY Fig 37 DF Mode with active VLU Code and announcement of new VLU Code 29 User manual Direction Finder RHOTHETA RT 600 2 4 9 Switching to a new VLU Code While on the LoJack Scan Page tracking one VLU Code 0001A and notified of a new VLU Code G2HC7 1 press F1 to continue tracking 0001A 2 press F2 to start tracking G2HC7 3 Time elapsed since G2HC7 was last received 4 Time elapsed since 0001A was last received If F1 is pressed for 2 sec the indicated VLU Code G2HC7 and ID 00014 are deleted Fig 38 LoJack Scan Page with one active VLU Code and one new VLU Code 2 4 10 Blo
33. figured as ON enabled see Setup Edit Page point 10 Even to avoid compatibility problems with already existing older remote control software it is possible to disable switch off this additional data block see Setup Edit Page point 10 Optional serial input Only used for optional commands to control DCU parameters If as example the direction finder frequency is changed remotely there is send to the DCU one time this data block with the new frequency For detailed content see page 52 46 User manual Direction Finder RHOTHETA RT 600 6 3 2 Serial standard output protocol description Specification serial standard output The binary data stream with a length of 39 bytes starts with a header byte value hex OxAO as ID for DF Mode The next bytes contain different values for status bearing information and also service The last byte is used for data stream checksum control Remark This is a binary data protocol So every byte value from Ogee 2094 0x00 OxFF is possible Because of this it is not allowed to realize a start byte detection by the content 0xAO The idle line detection is recommended for detection the end of message Register of databytes for details see next page byte no Header 0xA0 Id for DF Mode Number 39 bytes in the complete message including header and checksumbyte Status 1 HSB x x Ix lx x xIx Ix LSB Receiving Squelch controlled by AU
34. ich are very close to the noise level In this case it will be necessary to reduce the squelch level below the noise level As soon as the modulation of a signal can be heard on the speaker it can be expected that bearing calculation is possible If the noise is randomly distributed as with white noise and no other signal is received the bearing indication will also be random If the noise is not random but rather a specific disturbance the bearing indication will point to the source of the noise If there is a very weak signal buried in the noise this signal will produce a correct bearing indication thanks to sophisticated bearing technologies used in the RT 600 system Fluctuations due to noise will be small even at low signal levels however the reaction time of the bearing indication can increase To verify if a bearing indication is due to white noise or to an internal disturbance source or if it is due to a valid signal the aircraft should make a slow turn If the bearing indication is due to an external signal e g a SAR beacon the bearing indication should compensate the changed relative flight angle Example with a bearing indication of 30 The signal is hardly audible as it is buried in the noise The airplane makes a turn left by 60 If the bearing indication is not changing to approximately 30 60 90 after a few seconds the bearing is likely to be due to noise or internal disturbances from the aircraft Note
35. if the squelch level is above the noise level without received signal If the antenna unit is placed close a heavily disturbing electronic devices the squelch level has to be raised thus making the direction finder being less sensitive In receive modes where the squelch level is set automatically an A above the marker indicates the Autosquelch functionality gt Last Signal lt timer showing the time since a signal has been received for the last time i e since a signal has been stronger than the squelch level Values are minutes seconds 19 User manual Direction Finder RHOTHETA RT 600 2 3 3 Special Options in COSPAS SARSAT DF Mode Especially for the use together with beacons transmitting a data signal according to COSPAS SARSAT specifications in the 406 MHz Band special functionalities and pages are being provided After selection of a COSPAS SARSAT Frequency Refer to the chapter Frequency selection Page the bearing page provides additional information and operating options O 2 3 1 2 3 4 Fig 22 Operational Elements and Display in COSPAS SARSAT DF Mode gt Auto Squelch lt indication indicating that the squelch level is set automatically to be close to the noise floor It is recommended to always use the Auto Squelch during COSPAS SARSAT operation This can be achieved by manually selecting 0 lowest possible value or 60 highest possible value as squelch level Du
36. ils 2 4 2 LoJack Scan Mode Start scanning for a VLU Code For the convenience of Law Enforcement and other special ops users who frequently engage in tracking SVRS Stolen Vehicle Recovery System signals such as LoJack LoJack Corp FCC 90 20 Part 2 SVRS RHOTHETA has optimized the power on procedure of the RT 600 LE version so that right after the STARTUP screen the unit displays automatically the LoJack Scan Mode page to start immediately scanning for a valid VLU Vehicle Location Unit code without pressing any key SNE ENS Pu Hi Li pe xv E d M S EE das blinking SAR DF 517 Fig 30 LoJack Scan Mode unit is scanning for a LoJack VLU Code 1 gt scan LoJack lt DF is scanning for any new LoJack VLU Code 2 gt EXIT lt press F1 to exit and switch directly to DF Mode 25 User manual Direction Finder RHOTHETA RT 600 2 4 3 LoJack Scan Mode from any other page While operating on any page other than the LoJack Scan page the user can switch directly to LoJack Scan Mode by pressing Hotkey F2 for 2 secs 1 press Hotkey F2 for 2 secs to switch to the LoJack Scan page Fig 31 Hotkey F2 26 User manual Direction Finder RHOTHETA RT 600 2 4 4 Manual activation of LoJack Scan Mode 1 select the LoJack frequency see also Frequency Selection Page 2 press F1 to switch back to the DF MODE RHOTHETA SAR DF 517 Fig 32 FRQ Selection Page FRQ LoJack BAND LoJack 164 174 MHZ While in DF MOD
37. imming optional Input Impedance gt 50 kQ Low active as example switch to ground NVG status line for LCD At input voltage lt 2 5 Vpc the LCD dimming operates in night NVG ere mode Maximum brightness ca 4 of day default mode brightness dimming optional Input Impedance gt 50 kQ Audio LF AC coupled voltage source with very low inner resistance Maximum output voltage ca 8 Vpp 2 83V pays at maximum Volume Maximum output power ca 2 W with 4 Q speaker Audio output signal If a headphone is connected 32 600 Q 100mW we recommend using a resistor 18 Q 0 25 W between audio output and headphone to prevent damage of the headphone Serial interface RS232 9600 baud 8 data bits 1 stop bit no parity TXD Serial output ca 10 V RXD Serial input ca 10 V 41 User manual Direction Finder RHOTHETA RT 600 5 3 Mechanical features Temperature range Display Control Unit e permissible operating temperature e permissible storage temperature Antenna Unit 3 e permissible operating temperature e permissible storage temperature Protective system e Antenna Unit Weights e Display Control Unit e Antenna Unit Dimensions e Display Control Unit e Antenna Unit 20 C 60 C 30 C 80 C 40 C 60 C 55 C 80 C IP 67 250 g 2000 g 82 mm x 82 mm x 43 mm width x height x depth 2270 mm x 185 mm Fig 48 DCU M
38. it Page gt Rep lt Push Button If pushed for a longer time ca 3 seconds it activates the repetition of the last valid relative bearing and signal level information Fig 4 Push buttons longer time keypress User manual Direction Finder RHOTHETA RT 600 2 1 2 Power On procedure After switching on the DCU pressing the ON OFF pushbutton a startup screen is displayed for five seconds 1 2 3 4 5 6 7 8 LN RHOTHETA SAR DF 517 7 7 sui x ON OFF RT 6500 DCU y Fig 5 Power On Screen System Type RT 600 System Version L for LAW ENFORCEMENT version or A for STANDARD version Web Address URL Software Revision of AU antenna unit serial Number of AU Additional service and maintenance information the two characters indicate installed options Software Revision of DCU display control unit serial Number of DCU After five seconds the equipment switches to the operational mode for LAW ENFORCEMENT version the LoJack Scan page is displayed as home page by default 10 User manual Direction Finder RHOTHETA RT 600 2 1 3 Main Pages Selection Two main modes can be selected from the DCU front panel e DF Mode Page displays all relevant operational bearing information depending on the type of signal being received e FREQ SELECTION Page allows to access and edit all pre programmed frequency memory channels 1 The gt Page lt rotary switch is used to select the
39. justable by the user oooocccocccccncccconccncnncnnnnncncnnacnnonenonnnnnnnos 13 ODER FRO Pals 14 FRQ Frequency Selection Page ccccoooccccccccnnccccoconcccocononannncononnnnnonannnnnnannnnnnannnnnnnnnnnnnnnnnnnnannnnss 14 Recall frequency of Memory channel 3 ccccccccccsseeecceeeeecceeneeeceeseecceuseecsageeecsegseesseuseeessageees 14 FRQ Selection Page with FIX1 selected cesses nennen nnn 15 FRQ Selection Page before frequency editing ooccccoooccoconoccnnononcnncnnacononanonnnnoncnnnnnncnnnonanennos 16 FRQ Selection Page after frequency editing cccccocccccoconcncononcncononcnncnnncnnonononnononcnnonnncnnconanonoos 16 FRO Selection ipe ES 17 Operational Elements in DF Mode oocccccccncccccnccoccnccoconococononacnonnnnnnnnnnononnnonannnonnnnnnnnnnnnnnnnonannncnnns 18 Blase pec 19 Operational Elements and Display in COSPAS SARSAT DF Modqe seeeeeeereee 20 COSPAS SARSAT Beacon Information Page cccccocccncccoccnncnoncnnconononcnnnncnnnnncnnononcnnnonancnnnnancnnnnnns 21 Tracking 121 500 MHz while in COSPAS SARSAT Mode eese 22 FRQ Selection Page with SCN COSPAS SARSAT Scan Page selected 23 DF page with active COSPAS SARSAT Scan Mode at the DF page eeeeeeesssse 23 DF Mode FRQ 156 800 MHz F1 for sc
40. ly recommended to use the COSPAS SARSAT scanning functionality in order to detect the correct frequency Refer to the chapter Frequency selection Page amp COSPAS SARSAT Scan Mode 20 User manual Direction Finder RHOTHETA RT 600 2 3 4 COSPAS SARSAT Decode Window The COSPAS SARSAT Decode Window allows decoding incoming COSPAS SARSAT data messages Only while this decode window is activated the decoding is possible An already received COSPAS SARSAT puls while DF bearing mode was activated can not be used for decoding afterwards In this case the user has to wait while this decode window is active for the next transmitted puls approx 50 sec later 1 2 3 4 5 6 7 8 Fig 23 COSPAS SARSAT Beacon Information Page gt Exit lt push button F1 button allows to exit the decode window and switch back to the COSPAS SARSAT DF Mode page gt SARSAT lt in the upper right corner of the display indicates that the COSPAS SARSAT decode function is activated gt Country lt displays the COSPAS SARSAT Country Code coded into the received data message gt Last Signal time since the last COSPAS SARSAT message has been received in minutes seconds format gt Position lt field showing in case of location protocols being used by the beacon the encoded GNSS position data latitude longitude transmitted by the beacon gt 15 HEX ID lt 15 HEX ID of the beacon in hexadecimal format
41. nd turn on the gt Page lt rotary switch 3 97 1 2 3 4 5 6 7 8 9 10 User manual Direction Finder RHOTHETA RT 600 I Cir Store Rep 9 CN AF2N DIM Yes d STORE ESTO SAR DF 517 md SON TOES i 7 x l x ON OFF RT 600 DGU pe Fig 41 Setup Page gt Store lt push button must be pressed in parallel if a value of a setting shall be modified If a value can be modified the background stops to blink gt Select lt rotary switch used to scroll through the menu options The value of the actually activated menu option is high lighted with dark background and blinking gt Value lt rotary switch used to change values in menu options gt Store lt 1 has to be pressed in parallel if a value shall be modified gt SN Ratio lt menu option representing the necessary Signal To Noise Ratio Difference between signal and noise level used as criterion for the automatic squelch function Please refer to the chapter Squelch Operation for details Default value is 6 0 dB gt Mounting Position lt menu option to select Top or Bottom Mounting of the DF antenna In case of rooftop installation e g on land vehicles Top shall be selected In case of bottom down upside down installation e g on a helicopter Bot shall be selected If this option is not selected correctly all bearing values will be mirror inverted gt Bearing Offset lt men
42. nformation for ex beacon IDs GPS coordinates codes VLUS etc 2 3 1 Operating Elements in DF Mode m A B ni r A Pa I y f vy LID I D Y d y j 1 Clr Store Rep lt f j 9 1 eS JAN rmN om Ve 4 ai 3 3m Wises i id Ey Sasccsdiansss RHOTHETA SAR DF 517 ON OFF RT 600 DCU y i Fig 20 Operational Elements in DF Mode This picture shows the DCU operating in DF Mode on the international emergency frequency 121 500 MHz 1 2 3 4 with an active signal being received gt FREQUENCY lt Rotary switch activates the FRQ frequency page for changing and selecting the active frequency The last selected frequency remains stored after switching off on the device The selected frequency is shown on the graphic display bottom right Above additional information for the selected frequency is displayed The use of the rotary switch activates a sub page Please refer to the Frequency Selection section for details gt VOLUME lt Rotary switch to adjust the audio output level The volume of a linked external speaker or amplifier can be adjusted in a range from O off to 99 maximum loudness The selected volume is shown in the bottom left corner of the graphic display The volume remains stored after switching off on the device gt Squelch Level lt adjusts the squelch level The squelch level has to be above the receiving level without signal noise Only signal
43. ngs are controlled from the RT 600 DCU Display and Control Unit Of all the controls on the RT 600 DCU only the PAGE knob and the ON OFF button have functions which are not dependent on the active page selected by the user 2 1 General Operating Principles 1 2 3 4 5 6 7 j t Cir Store Rep lt 9 99 JAN ZAN DM Se RHOTHETA SAR DF 517 eo ON OFF RT 600 DCU l Fig 2 RT 600 DCU Front Panel Layout gt LC Graphic Display lt 128 x 64 dots dot matrix display dark blue on yellow green background showing all relevant operational information depending upon the selected page gt ON OFF lt Push button to switch on off the system gt Menu lt options for rotary and push buttons If a field with dark background and bright text is shown below a button or switch the function described in this field may be selected through the operational element above or below this menu field In case of the Page Menu the active page is high lighted with dark background while the inactive page is in black letters gt Volume lt Rotary Switch used depending on the active page to adjust the volume of the audio output or to select frequency values MHz steps gt SQL lt Rotary Switch used depending on the active page to adjust the squelch function or to select specific functions on a page depending upon the interactive menu on the display Push buttons see next page gt Page lt Rotary Switch Sel
44. nnononnnononenos 52 Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 Fig 12 Fig 13 Fig 14 Fig 15 Fig 16 Fig 17 Fig 18 Fig 19 Fig 20 Fig 21 Fig 22 Fig 23 Fig 24 Fig 25 Fig 26 Fig 27 Fig 28 Fig 29 Fig 30 Fig 31 Fig 32 Fig 33 Fig 34 Fig 35 Fig 36 Fig 37 Fig 38 Fig 39 Fig 40 Fig 41 Fig 42 Fig 43 Fig 44 Fig 45 Fig 46 Fig 47 Fig 48 Fig 49 Fig 50 User manual Direction Finder RHOTHETA RT 600 List of figures RT 600 Airborne Direction Finder SySteM oooccccccoccccccnoccnconononnnnncononnnnnnnnnonnnnnnnnnnnnonnnrnnonnnrnnnnnancns T RI 600 DCU Front Panel ESYOULb titan 8 Push buttons short time keypress cccccccccceseeecceeseeeceeseeeceeuseeeceaeeseegeeesseaeeeeseageeessageeesseneeeesas 9 Push buttons longer time keypress ssseessesseesseeeeene nennen nnne nnne nn nn nnn nnn nn nnn 9 PowerON SC ET UT 10 Rage elec aa 11 TAMIA AGUS UMC DLE 11 Manual squelch mode correct squelch adjustment oocccocnccccncoccccccnncnoncnncnconnnnnnnonannnnanonnanonnnnos 13 Manual squelch mode Incorrect squelch adjustment cccoocncoccccccnccocnccncncnnnnnnnnnnnnnnnnnnnnnnnnnnnos 13 Automate sgielch TIOGOGs die A sene is gu asa Ea d Rude dae 13 Automatic squelch mode with strong signal oocccooncccoccncccncnnnnncncnnnnnnnncnonnnnnonnrnnnnnrnnonarnnnnnnnnnos 13 Automatic squelch mode and not ad
45. o 217 000 MHz e Medical beacons Project Lifesaver tx wrist ankle tx 213 000 MHz to 216 000 MHz e ETS tx stolen cash asset recovery tx bait tag tx 216 000 MHz to 220 000 MHz tx transmitter s However any future or current user of the Rhotheta RT 600 must be aware that tracking signals on the frequencies listed above may be challenging and even frustrating due mostly to negative factors in some of the transmitters Very low RF power output e Inefficient antennas e Battery powered devices with a low battery condition e Devices worn or located in conditions of poor RF propagation Devices with channel spacing different than the one specified for the RT 600 These factors can make it very difficult for the DF to receive the signal and or display an accurate bearing Disclaimer For the reasons explained above and even though the RT 600 features top performance in its class RHOTHETA does not offer and is not to be held responsible for any guaranteed minimum range or distance to a transmitter in this band 2 5 Setup Edit Page System settings are displayed in the setup page The functions described in this section should be used by trained personal only Cir Store Rep lt gt 29 JAN JaN bm 9o s Fig 40 Accessing the Setup Page The setup page can be accessed by holding down the gt CLR lt 1 and gt REP lt 2 buttons simultaneously and in the same time performing a left ha
46. oJack 164 000 to 174 000 MHz 12 5 kHz steps FM ETS 216 000 to 220 000 MHz 10 12 5 kHz AM COSPAS SARSAT 400 000 to 406 092 MHz Including 406 022 to 406 076 MHz Channel A S Frequency Options F1 VHF Air Band 118 000 to 136 992 MHz F2 extended VHF Marine Band 137 000 to 163 000 MHz COSPAS SARSAT Full automatic detection of any active COSPAS SARSAT channel A to S fast scan mode within 400 ms COSPAS SARSAT Reception and decoding of COSPAS SARSAT data signal 112 or 144 bit decoding specified according to COSPAS SARSAT LoJack decoding Selectable LoJack ID display and selective active filtering Special scanning complete maritime ship band scanning within 3 s modes channel 01 88 also frequencies between 2 channels are included With undisturbed wave field and sufficient field strength Measuring by changing the angle of incidence with the antenna rotating on a revolving table in order to eliminate environmental influences on the results No modulation 39 User manual Direction Finder RHOTHETA RT 600 Bearable modulation A3E F3E A3X ELT modulation F1D G2D COSPAS SARSAT Bearing largely independent of modulation Polarization Vertical Polarization error lt 5 at 60 field vector rotation Garbling cone Ca 30 to the vertical Time of response lt 50 ms with sufficient reception field strength L C graphic display 128 x 64 pixels supertwist transflective extended rang
47. or 0x94 Jack ID decoding data is always marked by the first data byte header 0x93 or 0x94 Header 0x93 LoJack ID editing sub page is selected Filter VLU 3 all valid and received LoJack pulses are indicated 0x94 Lojack Decode amp DF Mode with active Filter ID Number of bytes in the complete data stream decimal 26 default value Nonrelevant Bit 0 Receiving On Off 0 gt No Receiving no bearing 1 gt new LoJack pulse received IE 7 Lojack ID Replay Code 5 x ASCII Chars No BIOZ set Example ASCII 000R1 Receiver Level Out Max 0 LoJack Decoder Status O Off Wait for Preamble Preamble Ok FlagPattern Ok Data BitError gt 1 Data Ok No VLU VLU Ok ID Ok Filter IDONLY 20 a 25 Nonrelevant Remark Only if byte no 8 bit 0 gets 1 Receiving On then an active LoJack pulse is received and so on the corresponding LoJack ID valid otherwise the LoJack ID only shows the actual adjusted LoJack Filter ID of the direction finder 51 User manual Direction Finder RHOTHETA RT 600 6 3 5 Optional serial input protocol description Specification serial input optional The serial input is normally used for service and maintenance only Nevertheless it is possible via this interface to remote control the actual frequency and the squelchlevel of the DF system If a valid data stream is send to the DF then the actual frequency selec
48. ort description of the indicated error In case of coincidence of various errors the error with the highest priority will be displayed Reason Error 12 Main voltage supply Main Voltage input too low lt 10 0 V VOLT DU Connection No serial data RS485 from Antenna Unit No or damaged Error 11 l antenna gt display connection between antenna and display or damaged antenna unit NO AU or Antenna Unit Error 10 Connection Incompatibility or bad data connection between display and antenna BAD AU antenna display Error 9 Remote Unit Incompatibility or bad data connection between display and external BAD RU serial Remote Unit or PC Antenna Unit Voltage supply at Antenna Unit too low x 9 0 V Main voltage Error 8 supply too low or considerable drop of voltage between display and VOLT AU antenna Error 7 Connection Incompatibility or bad data connection between antenna and display BAD DCU Display gt Antenna Error 6 Connection No serial data from Display Control Unit to Antenna Unit NO DCU Display Antenna Error 5 antenna Error in synthesizer oscillator of receiver in Antenna Unit PLL ERR Error 4 received transmitter Received frequency too high more than 6 KHz error of transmitter FRQ OFS Error 3 received transmitter received frequency too low more than 6 KHZ error of transmitter FRQ OFS Error 2 radio distance Data Bits of decoded signal CO
49. ption The data content depends on the actual mode of the direction finder To get special data the direction finder has first to be switched to the equivalent mode COSPAS SARSAT Decoding data This data is only available and valid if e Display Control Unit with actual software Rev gt 3 20 see Power On procedure page 10 e Configuration of Extended serial ON see Setup Edit Page point 10 e Direction Finder COSPAS SARSAT decoding mode is activated by selecting the corresponding page see COSPAS SARSAT Decode Window page 20 and page 21 and so on Header byte O of data 0x91 A valid COSPAS SARSAT decoding data protocol is always marked by the first data byte header 0x91 Always after receiving and decoding of a valid COSPAS SARSAT pulse the complete data protocol with 33 bytes is send out one time Byte No 0 Header 0x9 Identification for CP Sarsat decoding mode 1 Number of bytes 7 if no decoded pulse is available 33 if new pulse was received and is available Bit 0 0 gt No new 406 MSG decoded data available 1 gt New valid 406 MSG available Sync Frame Ok Check Error Status for Bit Errors Bit 6 1 AutoSquelch Level valid range 0 60 decimal Bit 7 1 Squelch controlled by AU P xg Signallevel of received signal valid range 0 99 decimal Voltage of Antenna Unit Power Supply input valid range 80 255 decimal 8 0 25 5 V DC 6
50. rform the following steps 1 Remove the cover caps of the four rotary switches i 2 Loose the screws visible below the position of the cover caps 3 Remove the plastic button from the axis of the four rotary switches 4 Mount dismount the display control unit 5 Re install the plastic buttons on the axis of the four rotary switches 6 Fixthe screws so that the plastic buttons are fixed on the axis 7 Re install the cover caps on the four rotary switches E rt User manual Direction Finder RHOTHETA RT 600 4 3 System Interconnect Wiring Diagram Also refer to chapter Technical Data for details optional connection Head Phone i Impedance 32 6 Ohm m e es Na Pauer as 1 Q8mil f Speaker oO eu uith resistor for pouer adaptation gt n C m SH We s 3i a f T zx T ae pora w 3 y y S gt SS A A l l 2 e T ao 9 g bo S22 a e e eo e 9 9 9 9 Y S O Y 8 25 Matt EN 18 Ohm olizo xmIz O lo lu 8 25 Matt EN 18 Ohm x O FUSE 1A slow 12U 30U DCS E Ground Power Supply GND Display Control Unit RS485 A RS485 A E e RS485 B RS485 B p ed y e 7 C ra 30U 189U 30U mid icm 30V 10u 20U a 9 Antenna commector shield cable shield connected to GND Fig 47 System Interconnect Wiring Diagram 9 pol Sub D plug female male 6 pol Amphenol plug female PTGO6SE10 6S SQ
51. ring COSPAS SARSAT Operation this will force the automatic setting of the level gt 121 500 lt menu option The COSPAS SARSAT signal in the 406 MHz band is transmitted only every 50 seconds in form of a short data burst of 440 or 520 ms approaching the transmitter it will be received earlier than the 121 500 MHz continuous signal due to its high transmitter power However in a lower distance to a transmitter bearing on 121 500 MHz is faster thanks to the continuous or rapidly intermittent signal The 121 500 MHz menu option allows a direct switch over to 121 500 MHz Direct return back from 121 500 to the COSPAS SARSAT band is possible from the 121 500 MHz bearing Window in COSPAS SARSAT mode Please refer to the chapter 121 500 MHz bearing Window in COSPAS SARSAT mode for details gt Decode lt menu option allows to open the COSPAS SARSAT Decode sub page by shortly pushing the F2 push button above the menu option gt Frequency range lt indication COSPAS SARSAT is using a channel spacing of 3 kHz for its beacons Due to the internal architecture of the direction finder it is possible to receive more than one channel in the same time Thus frequency steps of the direction finder are 8 33 kHz instead of 3 kHz The receive frequency covered by the current receive frequency setting is shown in the display line above the receive frequency indication Important If the exact frequency of the COSPAS SARSAT beacon is unknown it is strong
52. s above the squelch level are audible in the loudspeaker and used by the direction finder for bearing indication The gt SQL lt rotary switch allows to select the squelch threshold i e a minimum signal strength of an incoming signal to be processed The current settings on a signal level scale from 0 to 60 is shown in bright letters on dark background below the SQL rotary switch and as an arrow beside the signal Strength Bar Graph The gt CLR lt Push button is used for erasing the internal bearing value averaging store and the Last Signal Timer To activate this function the push button has to be hold down for a minimum of circa two seconds The sophisticated averaging store increases bearing precision and enables at all an usable 18 5 6 User manual Direction Finder RHOTHETA RT 600 bearing display in case of bad receiving signals if there is a far away transmitter and or temporary complete loss of a receiving signal Caused by the averaging procedure a drag error may occur which might be disturbing the bearing indication after a quick change of course of the aircraft or vehicle In this case the indicated bearing value lags by the real bearing value for about two seconds for very weak signals even longer By pressing this push button after a quick change of course the display will show the new bearing value without drag error Additionally the F1 CLR Push Button is used to activate specific functions high lighted in the
53. ssaecscincsetatsivacetutidcuces db 34 Antenna Installed in a Bad Location ccooocccccncncnoncnnnnacnnnnncnnnnononnnnncnnnnnnnnrnnnnnnnnnnnrnnnnnrnrrnnrnnnnnnnss 35 Antenna Installed in Good Locations cccccsssececeeeseecceeeeeecseuseecseuseeesaueeecsaneeecseeeesssuseesssaaeess 36 Deu Mounting Drawing vas 37 System Interconnect Wiring Diagram oocccconnnnccccccnccnoccnnononcnnnnnncnnnnaronnononcnnnnnnrnnnnnnnnnnnnannnonnncnnnnnos 38 DCU Mechanical Drawing all dimensions in mm ooocnccnccnnnncccnnncnoncnnconanonnnnonononnncnnnonanonnos 42 AU Mechanical Drawing all dimensions in mm occccccoccnccnccnnnononcnncnnncnnnonononnnoncnnonnnncnnnnanons 43 Timing OF SCN Ali Cale en A aia 46 User manual Direction Finder RHOTHETA RT 600 1 General information RHOTHETA Elektronik GmbH is the developer and manufacturer of the Direction Finder System RT 600 In the United States of America the system has also been marketed under the system designation SAR DF 517 1 1 Purpose of use of the direction finder The RHOTHETA direction finder system RT 600 or SAR DF 517 is designed to receive and locate emergency signals and special application signals on the international distress and application specific frequencies in the VHF UHF frequency range The system consists of the Display Control Unit DCU RT 600 DCU X X and the Antenna Unit AU RT 600 AU X
54. sssseesseseeeeen nennen menn nennen nnn nnns nnns 21 2 3 5 Tracking 121 500 MHz while in COSPAS SARSAT Mode eese 22 2 9 0 COSPAS SARSAT Scan Mode i ciunt it last oo Don eode buio bsec a a id duse gu ed debated gh 23 2 057 Marine Ship Scam Mode comicidad 24 24 Law Enforcement Operation visu cies rate intro edita 25 2 4 1 Power ON DIOCBdUfQ uie dali iris 25 2 4 2 LoJack Scan Mode Start scanning for a VLU Code oooccccccoccncccoccnnccnoconcnnononnononcnnnnanoncnnanennnnanens 25 2 4 3 LoJack Scan Mode from any other page sessi 26 2 4 4 Manual activation of LoJack Scan Mode ococccooccncccccccnccnoconononcncnnoncnnnnnnnnnnononcnnononcnnnnarnncnnnncnnonanens 27 2 4 5 Receiving and accepting a new VLU Code occcccconccccccoconcccocnococoncncnonacononanonnonannnnonnnrononnnnnnnnanoss 28 2 4 6 Entering a new VEU Code manually static anti idad 28 2 4 7 Tracking one VLU Code while monitoring new VLU Codes occccccoccnnccccccnconoconcononcnncnnnnnnnonanononanons 29 2 4 8 Tracking one VLU Code and receiving a new VLU Code ococooccncncoccncconccnconoccnnononcnnnnnnnnnonancnnonanons 29 249 Switching 10 2 NEW VEU Code oie 30 2 4 10 Blocking function of one LoJack VLU Code oooccccocccccccoccncccoccnnononcnnccnncnncnnnconononcnnnnnarononnanennonanens 30 Z4 bL Packing inthe 215 16 220 MHZ DANN escalada 31 20 Sep Te GI AG T S 31 3 ERROR MESSAGES 00 A E DM IE M aes 33 A INSTALLATION ista il aa 3
55. tion at the DCU is switched to Block2 AUXO At this memory channel the new frequency is stored and used automatically Refer to the chapter Frequency Selection Page If the frequency is changed by one valid data stream no more serial input is necessary The actual frequency can be changed again at any time by manual operation at the DCU The timing of serial input if used is strictly fixed The optional serial input has to take place directly after a complete serial output max 50 ms delay time If a new changed frequency is commanded to the DCU via this serial input interface it can take up to 1 sec of time until this new frequency is ready for operation bearing It is strictly not recommended to use the frequency remote control for any scan mode The frequency control has to be used for static frequency change only Register of databytes Header OxCO 1 Number of bytes in the complete message including header and checksumbyte TEES not used for normal operation any byte values allowed 4 Volume 0 100 Frequency Hz frequency is rounded to the according grid automatically Valid Range for Standard Version Valid Range for LE Version 118000000 123000000 Hz 8 333 kHz 1180 1230000 Hz 1640 1740000 Hz 156050000 162025000 Hz 5 000 kHz 15995 2400000
56. tual operating mode of DCU O Standard bearing page 1 Frequency memory page 2 CospasSarsat decoding page 3 LoJack decoding page ID edit e Frequency bytes 8 11 gt 32 bit value actual adjusted frequency Hz Example Ox073DF160 gt 1215000000 gt 121 500 MHz e Active Band Standard Version A O VHF Airband 1 VHF Marineband sea 2 VHF Marineband coast 3 UHV Airband 4 CospasSarsat LE Version L O VHF Airband 1 LoJack 2 Lifesaver 3 ETS 4 CospasSarsat e Actual Squelchlevel byte 13 Range 0 60 without signal the actual squelchlevel should always be adjusted a little bit over the noise level Refer to the chapter Squelch operation e Level byte 27 Range 0 99 actual receiving level without signal this value is equal to the noise level If a signal is received then this value corresponds to the signal strength of this signal e Relative Bearing averaged byte 28 29 gt 16 bit value Range 0 359 OxFFFF if the value OxFFFF then no valid bearing is available otherwise this value contains the actual averaged bearing information in Deg 0 359 Example 0X0114 gt 276 bearing left side oriented to heading e Bearing Live Min Max byte 30 31 amp 32 33 gt 16 bit values Range 0 359 OxFFFF Only for signal quality or additional information NOT recommended for bearing indication The relative live bearing field contains the max min bearing in degrees without
57. u option to include a constant offset correction to the bearing indication Bearing values in degrees will be changed according to the offset value gt Maximum External Dimming Voltage for Legends lt menu option which sets the upper limit of the dimming input voltage for the legends panel Range 1 5 28 V gt Minimum External Dimming Voltage for Legends lt menu option which sets the lower limit of the dimming input voltage for the legends panel Range 1 5 28 V gt Page lt rotary switch to be turned right hand to go back to the Direction Finder page A left hand turn on this rotary switch will show up an additional service page with debug information used for system checks gt Extended Serial lt It is possible to enable or disable the extended serial data protocol Only of interest if serial data is used by any connected control units like moving maps or computers For detailed information see Serial interface data protocol short description at page 46 If there are compatibility problems with already existing older remote control software it is recommended to switch OFF the extended serial data protocol 552 User manual Direction Finder RHOTHETA RT 600 3 Error messages If an internal error of the device is recognized a corresponding flashing error message will be shown in the DF pages Fig 42 Error message Error Messages Error location 1 Error message including error code in brackets 2 Sh
58. ver the noise level a the receiver audio output remains quiet and no wrong noisy bearing is indicated Fig 8 Manual squelch mode correct squelch adjustment Incorrect squelch adjustment If the squelch level is set b below the noise level a a wrong noisy bearing is indicated Fig 9 Manual squelch mode Incorrect squelch adjustment Automatic squelch mode Automatic squelch mode is indicated by an A c above the squelch level marker Depending on the SN Ratio setting the squelch level is automatically set slightly higher than the noise level Using the SQL rotary switch 1 the user can change to manual squelch mode Automatic squelch mode can be activated again by setting the squelch level manually to lt 0 or gt 60 Fig 10 Automatic squelch mode Automatic squelch mode with strong signals Strong short receive signals will not modify the squelch level setting Fig 11 Automatic squelch mode with strong signal Automatic squelch mode level not re adjustable by user c When the squelch is adjusted automatically by the system and the user is not allowed to change it an X c is displayed above the squelch level marker Fig 12 Automatic squelch mode and not adjustable by the user 13 User manual Direction Finder RHOTHETA RT 600 2 2 Frequency FRQ Selection Page The Frequency Selection FRQ Selection Page allows the user to select a frequency select a band and edit
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