PathTrax Users Manual.pub
Contents
1. lt Back Cancel Continue with automatic software installation Found New Hardware Wizard i Please wait while the wizard searches Se Gy USB Serial Port Next gt Cancel The Wizard will find and begin installation of the software Page 25 PRAXSYM Found New Hardware Wizard Please wait while the wizard installs the software ee F USB Serial Port we FTLang dil To C AWINDOWS system32 CITE TTT TTT TTT lt Back Newt gt Cancel Found New Hardware Wizard Completing the Found New a Hardware Wizard SS The wizard has finished installing the software for F USB Serial Port E Click Finish to close the wizard Cancel Click Finish The USB Serial Port is now installed Page 26 PATHTRAX Notes Page 27 PRAXSYM Notes Page 28 PRAXSYM 090414 Rev C 900 000005 0012. PRAX S Y Mi pathTrax PRACTICAL SYSTEMS ENGINEERING User s Manual The solution for making easy shielding effectiveness measurements A Path Trax PATHTRAX TABLE OF CONTENTS Chapter 1 General Information 2 e Introduction e Specifications e Receiver e Transmitter Chapter 2 Controls and Connections 6 e Receiver e Transmitter Chapter 3 Operation 8 Chapter 4 Remote Operation 16 e User Commands e installing the USB Serial Driver Warranty Statement PRAXSYM warrants that all items will be free from defects in material and workmanship under use as specified in this guide for a period of one year from date of delivery PRAXSYM further agrees to repair or replace at its dis cretion any failure which upon PRAXSYM s inspection appears to be a result of workmanship or material defect In no case shall PRAXSYM s liability for breach of warranty exceed the purchase price of the items in question PRAXSYM s liability on any claim of any kind for any loss connected with or resulting from the use of performance or breach thereof installation inspec tion operation or use of any equipment furnished by PRAXSYM shall in no case exceed the purchase price of the goods which give rise to the claim Praxsym Inc P O Box 369 Fisher IL 61843 217 897 1744 www praxsym com Page 1 PRAXSYM Chapter 1 General Information Introduction PathTrax is a user friendly microprocessor based transmitter and receiver sy
3. Shield Level LOCK off FRQ ADJ 100 KHz 912 8MHz FREQ Shield Level Mode Page 9 PRAXSYM Receiver Initial Set up and Power On Attach one of the antennas to the RF connector located on the top of the receiver Rotate the POWER switch to the ON position The receiver powers up in SIGNAL STRENGTH mode In SIGNAL STRENGTH the receiver displays the level of signals at the current freguency Allow the receiver to warm up for 5 minutes before taking measurement data Setting the Receiver Frequency The receiver powers up each time tuned to the default frequency Rotate the FREQUENCY adjust knob to tune the receiver in 1 MHz steps Depress the F DIGIT button to rotate the step size between 10 kHz 100 kHz and 1 MHz The current step size is displayed on the FRO ADJ line of the display Rotate the FREQUENCY adjust knob to tune the receiver in the selected step size Setting the Receiver Tone Threshold The receiver contains an audio tone generator that can be used to alert the operator if a shield level has dropped below a predeter mined threshold level This feature is especially useful when sweep ing across seams or around openings in a shielded enclosure when the LCD is not easy to view The tone alert feature may only be used in SHIELD LEVEL or PATH LOSS mode The frequency of the output tone is determined by the signal level measured by the receiver Using the THOLD arrow keys on the top of the receiver adjust the thres
4. 0 cable 5 pin supplied The connector on the unit is a Mini USB Type B with the following pin out o eee VBUS Bus Voltage from host eee Signal Ground Configuring the Control Software The PathTrax units have an asynchronous serial communications interface A USB to serial converter is built in This allows the user to connect the PathTrax units to a laptop computer without the use of external hardware Because the units use asynchronous serial communications no special application software is required The remote interface may be driven by standard terminal emulator software Versions of this software are available without cost from the internet A typical version is Tera Term Pro Before remote con trol of the PathTrax units can begin a driver must be installed so that the terminal emulator software can communicate with the USB to serial converter inside of the PathTrax unit Page 16 PATHTRAX Install the supplied cable between a USB port on the PC laptop and the USB port on the PathTrax unit Start the terminal emulation soft ware Open the Terminal setup window from the Setup Menu Select CR LF for Receive Select CR for Transmit Enable Local Echo Open the Serial Port setup window from the Setup Menu Set the pa rameters as indicated Port USB may configure from COM1 to COM12 Baud rate 9600 Data 8 bit Parity None Stop 1 bit Flow Control None The settings may be found in various places dependi
5. 0 MHz Pathtrax 500 covers 489 to 512 MHz Receiver Tuning Step Size Operating Modes IF Bandwidth 1st IF 2nd IF RF Input Connector RF Input Impedance Input Preselection Measurement Accuracy Maximum Safe Input Level Battery Operation AC Charger Operation 1 MHz 100 kHz and 10 kHz Signal Strength Spectrum Monitor Path Loss Shield Level 15 kHz nominal 90 MHz 450 kHz TNC Female BNC on Pathrax 500 50 nominal 4 pole Chebychev 80 MHz 1 dB bandwidth 1 0 dB 110 dBm to 0 dBm 2 0 dB 120 dBm to 110 dBm 10 dBm 10 mW minimum 4 hours minimum at full charge 95 265 VAC 48 65 Hz Page 3 PRAXSYM Charge Time Remote Operation I O Connectors Controllable Functions Output Data Reading Rate Controls LED Indicators 90 minutes typical via USB interface 5 pin mini USB type B connector All functions except ON OFF Volume All measurement data and instrument status 500 ms step tuning frequency and read data ON OFF VOLUME FREQUENCY TUNE COARSE FINE THOLD sets threshold for go no go testing LOCK locks out control panel MODE SIGNAL STRENGTH SPECTRUM MONITOR PATH LOSS and SHIELD LEVEL and CAL provides path loss or shielding reference level normaliza tion BATTERY OVERTEMP BATTERY CHARGE BATTERY FAULT LCD Displayed Functions Frequency Battery Level Mode Signal Weight Case Size Strength Spectrum Monitor P
6. NCY control knob between frequency adjust mode and power adjust mode This allows adjustment of the output attenuator in smaller steps The current setting of the MODE button is displayed on the LCD Depress the F DIGIT button on the top of the transmitter to increment the FREQUENCY select knob between 1 2 and 5 dB steps The current attenuator step size is displayed on the PWR ADJ line of the display Page 11 PRAXSYM Setting the Transmitter Freguency The transmitter powers up tuned to the default freguency of the transmitter model Depress the MODE button on the top of the transmitter to select FREO mode Rotate the FREOUENCY adjust knob to tune the transmitter in 1MHz steps Depress the F DIGIT button to rotate the step size between 10 kHz 100 kHz 1 MHz The current step size is displayed as a cur sor under the corresponding digit of the freguency display Ro tate the FREOUENCY adjust knob to tune the transmitter in the selected step size Making Path Loss Measurements Before making path loss measurements turn on the transmitter and receiver tune both units to the test freguency set the trans mitter attenuator to 60 dB and allow both units to warm up for 5 minutes W ith the receiver in SIGNAL STRENGTH mode monitor the test freguency to insure no interfering signal is present on your test freguency Place the transmitter at the test location Place the receiver at a location approximately 5 feet from t
7. The frequency will be echoed back and rounded down to the nearest frequency that meets the current step size Example FR 507 00 Returns the current frequency of operation Example FR 505 00 Page 19 PRAXSYM SR lt CR gt Status Reguest Returns LC if unit is in Local Mode and RM is unit is in Remote Mode Next it returns OK if conditions are normal If the unit has lost phase lock UNLCK is returned Example LC RM OK UNLCK BA lt CR gt Returns battery voltage Example BA lt 09 60 LC lt CR gt Local mode place the front panel in control OK RM lt CR gt Remote mode locks the front panel OK AT XX lt CR gt Sets attenuation XX is decimal number between 0 and 60 OK AT lt CR gt Returns the value of the attenuation Example AT 53 VR lt CR gt Returns version Example Vx xx PO lt CR gt Returns value of output power in dBm Example PO 30 PO XX lt CR gt Sets amount of output power in dBm XX must be decimal number between 30 and 30 OK Page 20 PATHTRAX OFF lt CR gt On the PathTrax 838 TX this turns the amplifier off OK ON lt CR gt On the PathTrax 838 TX this turns the amplifier on OK Installing the USB Serial Driver Both the PathTrax receiver and PathTrax transmitter have a USB V2 0 communications port This enables the product to be controlled by any PC or laptop with a USB V1 1 or V2 0 interface When used by the user in normal operation the USB interface mimics RS 232 serial com
8. ath Loss and Shield Level CAL Status LOCK Status Frequency Adjust Status Coarse or Fine 5 5 Ib Nominal 11 7 H x 5 1 D x 4 9 W Page 4 PATHTRAX Transmitter Tuning Step Size Maximum Output Power Output Power Control Output Level Accuracy Harmonics Output Impedance Load VSW R RF Output Connector Battery Operation Batteries AC Charger Operation Charge Time Remote Operation I O Connectors Controllable Functions Output Data Reading Rate Weight Case Size 1 MHz 100 kHz and 10 kHz 30 dBm nominal 1 Watt 1 dB steps from 30 to 30 dBm 1 0 dB maximum over Temp and Fre quency 50 dBc typical 50 nominal Safe operation into infinite VSWR TNC Female BNC on Pathtrax 500 2 hours minimum at full charge Nickel Cadmium 9 6V 1800 mAh 95 265 VAC 48 65 Hz 90 minutes typical via USB interface 5 pin mini USB type B connector All functions except ON OFF Instrument Status 500 ms step tuning frequency 5 5 Ib Nominal 11 7 H x 5 1 D x 4 9 W Page 5 PRAXSYM Chapter 2 Controls and Connections Receiver FREQUENCY F DIGIT The frequency select knob operates in con junction with the F DIGIT button Pressing the F DIGIT button toggles the step size between 10 kHz 100 kHz and 1 MHz The current step size is displayed on the FRO ADJ line of the display Turning the knob clockwise increases the frequency by the se lected step size Counter clock
9. er or range The data included in the previous command was invalid or out of range ERIM lt CR gt Incompatible Mode for command The command was not recognized because it was entered in an incompatible mode ERNI lt CR gt Not Initialized Shield Level not available Response to the SL guery when the Receiver has not been initialized with the Transmitter User Commands n Note The under score indicates a space hex 20 is sent in the command Note lt CR gt indicates that the user should press the enter key Receiver Commands SS lt CR gt Returns the last measured signal strength in the form XXX dBm for the current band Example 70 SL lt CR gt Returns the last measured shield level in the form XXX dB for the current frequency Example 103 Page 18 PATHTRAX PL lt CR gt FR XXX yy lt CR gt FR lt CR gt BA lt CR gt VR lt CR gt Returns the last measured path loss in the form XXX dB for the current freguency Example 103 Sets receiver freguency in MHz Example FR 507 30 lt CR gt Returns the current frequency setting in the form XXX yy MHz Example 500 00 Return battery voltage note the BATT on the display begins to flash at 8 40 volts Example BA 08 60 Returns version Example PATHTRAX TX Vx xx Transmitter Commands FR XXX yy lt CR gt FR lt CR gt Set the frequency to XXX yy where XXX yy is a frequency within the band covered by the unit
10. frequency select knob operates in con junction with the F DIGIT button Pressing the F DIGIT button tog gles the step size between 10 kHz 100 kHz and 1 MHz The current step size is displayed on the FRO ADJ line of the display Turning the knob clockwise increases the freguency by the selected step size Counter clockwise rotation decreases the freguency by the selected step size MODE The mode button toggles the unit between FREQ and AT TEN The current mode is displayed on the MODE line of the display When in the Freguency mode the FREOUENCY select knob steps the freguency as set by the F DIGIT button When in the Attenuator mode the FREOUENCY select knob steps the out put level as set by the F DIGIT button ATTEN Pressing the ATTEN button changes the power output level in 10 dB steps from 30 to 30 dBm The current power level is displayed on the LCD screen Press the ATTEN button until the desired output power is displayed When the MODE is set to the ATTEN then the FREOUENCY select knob will change the output power in 1 2 or 5 dB steps selected by the F DIGIT button LIGHT This button activates the backlighting for the LCD display LOCK The lock button toggles on and off to lock the control panel in order to guard against accidental changes during a measure ment The status of the lock function is displayed on the LCD screen POWER This is a rotary ON OFF switch Rotate clockwise to turn ON rotate counte
11. h a fully charged battery the Fault light might illumi nate indicating the batteries are full and no charging will take place This condition is dependent on many factors including battery age battery charge time since last charge termination and charger voltage and there fore might not occur in all cases Should this condition occur but you would like to begin a new charge cycle turn the unit on for at least V gt hour discharge battery before initiating a new charge cycle 4 If it becomes necessary to remove or replace the NiCad battery pack a b Locate the bottom face plate of the unit which houses the battery compartment cover Remove 4 socket head screws from the battery cover bumper Remove 4 Phillips head screws from the battery cover Remove the battery cover and disconnect the 2 pin con nector Slide the battery out of the compartment Page 15 PRAXSYM Chapter 4 Remote Operation Both the PathTrax receiver and transmitter contain a built in USB to RS 232 converter allowing the user to connect the PathTrax unit directly to a PC with no external hardware or custom cables All PathTrax functions can be controlled remotely with the exception of power ON OFF and Receiver audio output volume All other functions including the calibration seguence can be handled via the USB connection The commands are in ASCII All commands are terminated with a CR carriage return hex OD The USB interface uses a Min USB 2
12. he transmitter and at the same height Set the receiver to PATH LOSS mode the receiver will flash INITIALIZE PRESS CAL on the display Ensure that there are no obstructions between the transmitter and receiver and then press the CAL button on the top of the re ceiver The display should indicate a PATH LOSS of 60 dB Return to the transmitter and depress the ATTN button The at tenuation will change to O dB so that the transmitter output pow er is now t30 dBm Verify that the receiver displays a PATH LOSS between 0 and 3 dB This reading may vary slightly as every environment is unigue Page 12 PATHTRAX The receiver may now be moved about and will display the PATH LOSS to the test transmitter Depress the LOCK button to prevent accidental changes to the con trol settings which may lead to measurement errors Making Shie d Leve Measurements Before making shield level measurements turn on the transmitter and receiver tune both units to the test freguency set the transmit ter attenuator to 60 dB and allow both units to warm up for 5 minutes W ith the receiver in SIGNAL STRENGTH mode monitor the test fre guency to insure no interfering signal is present on your test freguen cy Place the transmitter inside the enclosure on a marked reference po sition near the center of the enclosure Place the receiver outside the enclosure on a marked reference posi tion at least four feet from the transmitter and at
13. hold level to the desired level that the tone will be turned on The threshold level is displayed on the LCD on the THOLD line Connect the 32 headphones to the PHONES jack on top of the re ceiver The receiver s ON OFF switch is also the volume control for the tone generator output Page 10 PATHTRAX Transmitter Initial Set up and Power On Attach one of the antennas to the RF connector located on the top of the transmitter Rotate the POWER switch to the ON position Allow the transmitter to warm up for 5 minutes before beginning a test Setting the Transmitter Output Level The transmitter powers up with output level set to 30 dBm 60 dB at tenuation The output level of the transmitter is adjusted by changing the attenuation setting of the output attenuator 30 dBm output level corresponds to 60 dB attenuation and 30 dBm 1 Watt corresponds to 0 dB attenuation Depress the ATTN button on the top of the transmitter to step the out put attenuator in 10 dB steps The attenuation level always increases in 10 GB steps and to the next even 10 dB amount For example if the attenuator has been set at 13 dB using the rotary control in ATTEN mode pressing the ATTN button will move the attenuator to 20 dB 30 dB and so on When the attenuation level is set to 60 dB depressing the ATTN button will move the attenuation level to 0 dB Depress the MODE button on the top of the transmitter to toggle the function of the FREQUE
14. izard Please wait while the wizard searches The Wizard will find and begin installation of the software Found New Hardware Wizard Please wait while the wizard installs the software Page 23 PRAXSYM Found New Hai Completing the Found New Hardware Wizard The wizard has finished installing the software for ad USB Serial Converter Click Finish to close the wizard lt Back Click Finish The USB Serial Converter is now installed Found New Hardware Wizard Welcome to the Found New a Hardware Wizard NS Windows will search for current and updated software by looking on your computer on the hardware installation CD or on the Windows Update Web site with your permission Read our privacy policy Can Windows connect to Windows Update to search for software C Yes this time only C Yes now and every time connect a device Click Next to continue lt Back Cancel Begin installation of the USB Serial Port Decline the option to use Windows Update software search Click Next Page 24 PATHTRAX Found New Hardware Wizard This wizard helps you install software for USB Serial Port If your hardware came with an installation CD SEP or floppy disk insert it now What do you want the wizard to do Install from a list or specific location Advanced Click Next to continue
15. l is present the level will be displayed on the LCD Choose a clear frequency before operating the transmitter Page 8 PATHTRAX Spectrum Monitor Mode In SPECTRUM MONITOR mode the receiver can be used to view a 1 2 MHz span of the freguency spec trum This mode is ideal for locat ing a clear freguency that you can use for conducting a test or for identifying large interfering signals that could cause errors in measure ments Use the receiver s left and right THOLD buttons to move be tween each 1 2 MHz span of spec trum The Frequency control rotary knob adjusts the position of the marker Path Loss Mode MRK 22dBm9906 OMHz Spectrum Monitor Mode PATH LOSS mode can be used to measure the amount of attenua tion path loss between the transmitter and receiver Before making path loss measurements the receiver is initialized with the transmit ter to obtain a baseline measurement of O dB Once initialized the receiver can be moved around the stationary transmitter while moni toring the change in path loss Shield Level Mode SHIELD LEVEL mode can be used to measure the amount of atten uation shield level that is provid ed by an enclosure or other ob stacles between the transmitter and receiver Before making shield level measurements the receiver is initialized with the transmitter to obtain a baseline measurement of 0 dB low chg ES M BATTI THOLD 80 dB E 50 90 130 SHIELD LEVEL 90dB MODE
16. munications Plug the PathTrax unit into an available USB port with the supplied cable Close all programs communicating with the unit before un plugging the USB cable or turning the power off This is a two part installation The first seguence will install the USB Serial Converter The second seguence installs the USB Serial Port Page 21 PRAXSYM Found New Hardware Wizard This wizard helps you install software for FT232R USB UART If your hardware came with an installation CD SEP or floppy disk insert it now What do you want the wizard to do install the software automatically Recommended Install from a list or specific location Advanced Click Next to continue lt Back Cancel Begin installation of the USB Serial Converter Click Next Found New Hardware Wizard Welcome to the Found New Hardware Wizard Windows will search for current and updated software by looking on your computer on the hardware installation CD or on the Windows Update Web site with your permission Read our privacy policy Can Windows connect to Windows Update to search for software Yes this time only C Yes now and every time connect a device Click Next to continue lt Back Cancel Insert supplied CD and continue with automatic software installation Decline the option to use Windows Update software search Page 22 PATHTRAX Found New Hardware W
17. ng on the termi nal emulation software used Data Link Layer Description Transmission Packet The transmission packet consists of a series of ASCII characters capital letters used to identify the packet optional numerical data represented in ASCII and a carriage return ODh to indicate the end of the packet Transmission Flow Every packet in each direction is terminated with a carriage return ASCII ODh to indicate that the packet has been completed If the PathTrax unit receives 15 characters with no carriage return it will abort the packet and send an error response to the host There is no time out for the transmission of a packet Page 17 PRAXSYM Errors Either host or PathTrax unit will discard a packet if it contains an error The PathTrax Transmitter and Receiver will respond differ ently to a packet with an error using a code to help identify the source of the error If the host receives a packet that contains an error it must re issue a command to obtain the desired response Error response codes are listed below Invalid commands sent to the PathTrax Receiver will be acknowl edged with an error response An error response will consist of 4 ASCII bytes followed by a carriage return The error code consists of the two characters ER followed by a two character error status code ERIC lt CR gt Invalid command The command was not recognized Verify the command you are sending is valid ERIN lt CR gt Invalid numb
18. ource 95 250 VAC 47 63 Hz The green CHARGE light on the front face of the PathTrax unit will illuminate during the entire fast charge cycle The fast charge cycle of a discharged battery will normally take 1 5 to 2 hours When the unit is fully charged the CHARGE light will begin flashing indicating the trickle charge phase If the battery voltage drops below the recharge threshold in trickle charge the charger will reinitiate a fast charge cycle The Path Trax unit may be left in trickle charge mode over night 2 The OVERTEMP light indicates that the battery pack has exceed ed its maximum temperature during the charge process When the OVERTEMP light is illuminated the CHARGE light will be turned off indicating that the charge process has been halted Once the battery has cooled down to an acceptable tempera ture the charge cycle will resume Page 14 PATHTRAX 3 The FAULT light indicates that the charge process has been ter minated A FAULT will be indicated under the following condi tions a pang The charge is not normally terminated before the end of the cycle timer Excessive input voltage Very low battery voltage indicating shorted cells Battery voltage low after 1 12 of charge timer Excessive die temperature of the charge controller This FAULT will resume charging once the temperature drops A charge cycle is restarted while the battery is fully charged When the AC DC charger pack is turned on wit
19. r clockwise to turn OFF OUTPUT RF output connector 50 OHM REMOTE This is the USB connection port See section on remote operation for details on this connection Page 7 PRAXSYM Chapter 3 Operation Receiver Modes The receiver has four different modes Pressing the MODE button will cycle through SIGNAL STRENGTH SPECTRUM MONITOR PATH LOSS and SHIELD LEVEL modes The selected mode of operation is shown on the LCD Signal Strength Mode SIGNAL STRENGTH mode is used to measure the signal level of a con tinuous wave CW signal The receiver has a narrow 7 5 kHz IF bandwidth enabling it to measure a test signal in the presence of interfering signals in the same band Although the receiver has no demodulation capabilities it can be used to measure the signal level of narrow band modulated signals The signal strength is displayed on the LCD display in dBm decibels relative to 1 mW The receiver is calibrated at the time manufacture by applying signals of known lev els to the RF connector Antenna gain must be accounted for when making measurements using different antennas One should monitor the proposed test frequency in SIGNAL STRENGTH mode to ensure that no interfering signals are present before making measurements in PATH LOSS or SHIELD LEVEL modes To take full advantage of the dynamic range of the receiver interfer ing signals measured at the test frequency should be below 120 dBm If an interfering signa
20. stem that measures relative signal strength path loss and shield level The units are powered by rechargeable batteries for up to 4 hours of continuous operation 2 hours for the transmitter The battery charging circuitry allows full recharge in 90 minutes or less The large backlit LCD screen provides numeric as well as graphic representation of signal levels Operation is via top mounted controls or through the USB port provided Complete control of the unit s operation can be accomplished via the serial port with the exception of power ON OFF and receiver volume Measurement data can be transferred to a portable computer for later analysis Equipment List e Transmitter Receiver Hard Shell Case USB Patch Cable User s Manual Driver CD e Two Power Supplies e Two Antennas e 32 Stereo Q Headphones Safety Handling e The PathTrax system has been designed to survive in field usage however the following handling restrictions should be observed e Protect the units from electrostatic discharge e Do not connect high power gt 10 mW RF sources to the RF connectors e Do not connect DC sources to the RF connectors Page 2 PATHTRAX Specifications AII models of the PathTrax line share the same specifications except for the operating freguency The freguency ranges for these models are listed below Pathtrax 915 covers 885 to 960 MHz Pathtrax 860 covers 824 to 900 MHz Pathtrax 838 covers 806 to 87
21. the same height Ensure that the receiver reference position is within line of sight of the transmitter Set the receiver to SHIELDING LEVEL mode the re ceiver will flash INITIALIZE PRESS CAL on the display Ensure that there are no obstructions between the transmitter and receiver and then press the CAL button on the top of the receiver The display should indicate a SHIELDING LEVEL of 60 dB Page 13 PRAXSYM Return to the transmitter and depress the ATTN button The attenua tion will change to 0 dB so that the transmitter output power is now 30 dBm Verify that the receiver displays a SHIELDING LEVEL between 0 and 3 dB This reading may vary slightly as every environment is unique Close the door to the enclosure and begin sniffing with the receiver The receiver is now measuring and displaying the SHIELDING LEVEL of the enclosure Using the THOLD arrow keys on the top of the receiver adjust the threshold level to the desired level that the tone will be turned on The threshold level is displayed on the LCD on the THOLD line Depress the LOCK button to prevent accidental changes to the con trol settings which may lead to measurement errors Recharging the PathTrax Units The normal battery charge procedure consists of the following steps 1 Plug the recharge plug of the AC DC 15 V power pack into the recharge receptacle on the right side of the PathTrax Transmitter or Receiver Plug the charger line cord into an AC s
22. wise rotation decreases the fre quency by the selected step size MODE The Mode button toggles the receiver between Signal Strength Spectrum Monitor Path Loss and Shield Level The current mode is always displayed on the LCD screen Press the Mode button until the desired mode of operation is displayed CAL When setting up the unit for Path Loss or Shield Level meas urements pressing this button initiates the internal System Cali bration sequence See OPERATION section for details THOLD These two buttons increment the threshold value up or down The value is displayed on the LCD This is the signal level at which the audible alarm is triggered LIGHT This button activates the backlighting for the LCD display LOCK The lock button toggles on and off to lock the control panel in order to guard against accidental changes during a measure ment The status of the lock function is displayed on the LCD screen POWER ON OFF VOLUME Turn the control clockwise to power ON the unit and counter clockwise to turn it off The volume control changes the audio level for the alarm output PHONES This is the audio jack for the threshold tone output The supplied headphones can be plugged into this output jack INPUT RF Input connector 50 OHM REMOTE This is the USB connection port See the section on re mote operation for details on this connection Page 6 PATHTRAX Transmitter FREQUENCY F DIGIT The
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