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2-2

68P02945C75-A

June 1999

Theory of Operation

GTX/GTX LTR/LTS 2000 Portable Radios Service Manual

Transmitter

ANTENNA
SWITCH

FRONT-END
MODULE

H FILTER

POWER
AMPLIFIER

851-870 MHz

1ST MIXER

45.1 MHz

2ND MIXER &

DEMODULATOR

DET_AUDIO

RX_INJ

POWER
CONTROL

PWR_REF

TX_INJ

SYNTHESIZER

16.8 MHz

TEMPUS

PENDULUM

TEMPUS_D/A

PWR_REF

RED

YELLOW

PEND_EN

MIC_EN

SCB4

SCB3

SCB2

SCB1

D/A

DAC_SEL

LOCK_DET

SYNT_EN

PEND_EN

2.1 MHz

MOD_IN

SPI_DATA

SPI_CLCK

PRE-

AMP

TXB+

805.9-825 MHz

RF & AUDIO SECTION

PROCESSOR

HC11K1

SERIAL

EEPROM 4K

8-DIGIT

LCD DISPLAY

4 X 4 KEYPAD

DISPLAY/KEYBOARD DRIVER

ASFIC

PARALLEL BUS

SPI BUS

2.1 MHz

MOD_IN

RX_AUDIO

DET_AUDIO

MIC_IN

PTT

MONITOR

OPT

LOCK_DET

SYNT_EN

PEND_EN

SCI

ROT1
ROT2

VOL_SENSE

DAC_SEL

RAM 8K

ROM 128K

LOGIC SECTION:FOR FUF1190, FUF 1192, FUF1492A, FUF1493A, FUF1198

28-PIN

CONNECTOR

TO LOGIC SECTION

28-PIN

CONNECTOR

FROM RF SECTION

VOLUME

ROTARY

SWITCH
& LEVEL

CONTROL

ENCODER

VOL

ROT1

ROT2

RX_AUDIO

MUTE

INT. SPKR

ACC.

AUDIO

806-825 MHz

CON.

MIC_IN

INT. MIC

ACC.

MIC.

PREAMP

CON.

RADIO FUNCTIONAL BLOCK DIAGRAM

Содержание GTX 2000

Страница 1: ...GTX GTX LTR LTS 2000 Portable Radios Service Manual 6802945C75 A 68P02945C75 A Motorola Inc 8000 West Sunrise Boulevard Fort Lauderdale Florida 33322 9934 ...

Страница 2: ...ise configured for electromagnetic compatibility To avoid electromagnetic interference and or compatibility conflicts turn off your radio in any facility where posted notices instruct you to do so Hospi tals or health care facilities may be using equipment that is sensitive to external RF energy When instructed to do so turn off your radio when on board an aircraft Any use of a radio must be in ac...

Страница 3: ...the copyrighted computer program Accordingly any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola Furthermore the purchase of Motorola products shall not be deemed to grant either directly or by implication estoppel or otherwise any license under the co...

Страница 4: ...iguring the RIB and Radio xv Notes xvi Important Safety Information Intrinsically Safe Radios xvii FMRC Approved Equipment xvii Repair of FMRC Approved Products xviii Repair xviii Relabeling xix Do Not Substitute Options or Accessories xix Vehicles Equipped with Air Bags xix Section 1 Radio Disassembly Assembly Overview 1 1 Safety Information 1 1 Radio Disassembly 1 1 Battery Removal 1 1 Chassis R...

Страница 5: ... Amplifier 2 8 Audio PA Muting and Output Protection 2 8 Receive Data Circuits 2 8 Alert Tone Circuits 2 8 Section 3 Accessory Overview 3 1 Description 3 1 Operation 3 1 Handling Precautions 3 1 Maintenance 3 2 Section 4 Troubleshooting Overview 4 1 Troubleshooting Charts 4 1 Troubleshooting Flow Chart for Receiver 4 2 Troubleshooting Flow Chart for Transmitter 4 3 Troubleshooting Flow Chart for S...

Страница 6: ...90A FUF5591A RF Board Transmitter Module 8 5 Circuit Board Details for FUF5590A FUF5591A RF Board 8 6 Parts Lists for FUF5590A RF Board 8 7 Parts Lists for FUF5591A RF Board 8 10 Circuit Board Details Schematic Diagram Parts List for FLN8517A Battery Filter Board 8 11 Parts Lists for FLN8517A Battery Filter Board 8 11 Circuit Board Details for FLN8514A F LN9053A FLN9064A HLN9859 HLN9860 FEN1648 an...

Страница 7: ...N8577A Miscellaneous Parts GTX GTX LTR 8 18 Parts Lists for FLN8665A Miscellaneous Parts LTS 2000 8 18 Parts Lists for FLN8665B Miscellaneous Parts LTS 2000 SmartZone 8 18 Parts Lists for FSN5509A Speaker Microphone Assembly 8 18 Parts Lists for NAF5037A Antenna 8 18 Motorola Private Line and Digital Private Line are trademarks of Motorola Inc IBM is a registered trademark and PC DOS PC XT AT Conv...

Страница 8: ...C6DU1_N GTX Basic Radio 800MHz LTR H11UCD6CB1_N GTX Keypad Radio 800MHz Privacy Plus H11UCD6CU1_N GTX Keypad Radio 800MHz LTR Item Description X HLN3140 Front Housing Assembly with Logic Board X HLN3141 Front Housing Assembly with Logic Board X FLN2392 Front Housing Assembly with Logic Board X FLN2445 Front Housing Assembly with Logic Board X HLN9859 Logic Board I O Unit X HLN9860 Logic Board I O ...

Страница 9: ...xisting Users Only H10UCH6DC5BN LTS 2000 Portable Radio Q38 SmartZoneª H10UCH6DC5BN LTS 2000 Portable Radio Q37 SMARTNET Plusª Item Description X FLN2395A Front Housing Assembly with Logic Board for factory use only X FLN2395B Front Housing Assembly with Logic Board for factory use only X FLN2550A Front Housing Assembly with Logic Board for factory use only X FEN1649A Logic Board I O Unit Part of ...

Страница 10: ...rinsically Safe Radio includes FA 1200 mAH battery X X H73 Factory Mutual Intrinsically Safe Radio includes 600 mAH battery X X H224 600 mAH Slim Battery deletes standard battery Antenna X X H112 Omit Standard Antenna Miscellaneous X X H415 Bulk Packaging minimum 10 units per line item Chargers X H951 Omit Standard Charger X H437 Add Rapid Rate Charger 110 V X H438 Add Slow Rate Charger 220 V X H4...

Страница 11: ...ps X X HLN9421 DTMF Standard Leather Carry Case w Swivel X X HLN9426 DTMF Standard Leather Carry Case w Swivel for Fully Approved FM 1200 mAH X X HLN9427 DTMF Standard Leather Carry Case w Swivel for Fully Approved FM 600 mAH X X HLN9429 DTMF Standard Leather Carry Case w Belt Loop for Fully Approved FM 1200 mAH X X HLN9431 DTMF Standard Leather Carry Case w Belt Loop for Fully Approved FM 600 mAH...

Страница 12: ...Portable Radio UserÕs Guide X 68P02948C65 GTX LTR Portable Radio UserÕs Guide X X 68P02945C75 GTX GTX LTR LTS 2000 Portable Radios Service Manual X 68P02945C85 LTS 2000 Portable Radio UserÕs Guide Radio Service Software RSS X RVN4150 GTX GTX LTR X RVN4156 LTS 2000 X 68P02946C20 LCS LTS 2000 RSS UserÕs Guide X 68P02948C70 GTX GTX LTR RSS UserÕs Guide X X HKN9857 Programming Test Cable See RSS infor...

Страница 13: ...emperature Range Operating Storage 30 60ûC 40 85ûC Selectivity 25 kHz Adjacent Channel 65 dB FM Hum and Noise Companion Receiver 40 dB Dimensions H x W x D GTX total height includes radio antenna adaptor and antenna LTS 2000 total height includes radio antenna adaptor and antenna 12 86x2 32x1 09Ó 326 53 x59 x27 8 mm 12 86x2 32x1 17Ó 326 53x59x29 8 mm Spurious Rejection 65 dB Distortion 5 Weight w ...

Страница 14: ...RKN4034 Test Set Cable Connects radio to RTX4005B Test Box FLN8769 Tune and Test Fixture Enables board level maintenance 5880348B33 SMA Female to BNC Female Adapter Enables RF connection to radio antenna connector MOTOROLA NO DESCRIPTION CHARACTERISTICS APPLICATION R2000 R2400 or R2001D with trunking option Communications System Analyzer This monitor will substitute for items with an asterisk Freq...

Страница 15: ...81B45 110 Vac or 0180300E06 220 Vac MBT250 Surface mount thru hole repair station Temperature controlled self contained solder ing desoldering repair station for installation and removal of surface mounted devices 8180369E97 Flux holder applicator arrays for repair Allows for the proper amount of ßux to be applied to pad grid 1105139W02 30cc plastic syringe and ßux paste For use with ßux holder ap...

Страница 16: ...ction of Manual for prescribed heat setting 6680371B15 0 460 x 0 560 VCO shield SH260 6 12 14 11 2 3 4 5 1 7 8 9 5 6 7 8 9 1 14 4 3 2 12 11 P1 DETAIL FRONT SIDE NOTE Pins 2 and 7 are cut P1 3 5 mm plug 2 5 mm plug 33K 1 8 W 1 0 µF 47 Ohm 1 2W sleeve tip sleeve tip NOTE For proper speaker impedance the RTX4005B test set Audio out switch must be set to the MX position Speaker Hi Speaker Lo Gnd Mic A...

Страница 17: ...ique Model Variations Standard Package Version Letter Alpha Major Change Basic Privacy Plus Trunked Twin Type H 1 0 U C H 6 D C 5 A N Position 1 Type of Unit H Hand Held Portable Model Number Position 1 2 3 4 5 6 7 8 9 10 11 12 Position 4 Frequency Band Position 2 3 Model Series Position 5 Power Level Position 6 Physical Package Position 12 Position 10 Feature Level Position 8 Primary Operation Po...

Страница 18: ...o turn it on Software RIB Power Supply Plugs into 120 or 220 Vac outlet Computer GTX GTX LTR RLN4008 RIB 30 80369B72 or RIB to Computer Cable Plugs into RIB and computer Connects between the RIB and radio Programming Test cable Power Supply 7 5 Vdc HKN9857 RVN4150D for GTX GTX LTR or Note Battery can be used on programming cable making power supply optional RSS Manual 15 PIN 25 PIN Required Equipm...

Страница 19: ...xvi 68P02945C75 A June 1999 Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual Notes Notes ...

Страница 20: ... mark is shown below Radios must ship from the Motorola manufacturing facility with the hazardous atmosphere capability and FM Approval label ing Radios will not be upgraded to this capability and labeled in the field Do not operate radio communications equipment in a hazardous atmosphere unless it is a type especially qualified e g FMRC Approved for such use An explosion or fire may result Do not...

Страница 21: ... constitutes something done internally to the unit that would bring it back to its original condition Approved by FMRC A repair should be done in an FMRC Approved facility Items not considered as repairs are those in which an action is performed on a unit which does not require the outer casing of the unit to be opened in a manner which exposes the internal electrical circuits of the unit You do n...

Страница 22: ...be no substitution of items even if the substitute you wanted to consider appears as an approved accessory elsewhere in the Guide for some other communications equipment unit Approved configurations are listed by FMRC Approved Product in the annual Approval Guide published by FMRC That guide and the Approval Standard Class Number 3605 document can be ordered from the following address Training Res...

Страница 23: ...xx 68P02945C75 A June 1999 Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual This page intentionally left blank ...

Страница 24: ...work area minimizes static elec tricity problems Do not allow anything that can generate or hold a static charge on the workstation surface Keep the component leads shorted together whenever possible Pick up components by their bodies Never pick them up by their leads Do not slide the components over any surface Avoid handling components in areas with a ßoor or work surface covering that can gener...

Страница 25: ...igure 1 4 and beware of the front cover ßexible circuit 7 Remove the ßexible circuit using a ßat blade screwdriver or manually unlatching the ZIF connector Figure 1 5 Main Board Removal The front shield holds the main board onto the chassis To remove the front shield 1 Place radio chassis side down on a ßat surface 2 Apply downward pressure to chassis directly above one of the clips opposite PTT s...

Страница 26: ...hield using tweezers or sharp end screwdriver by undoing the four side catches Figure 1 8 3 Separate the front housing board from the front housing Radio Reassembly Front Housing Reassembly 1 Place the front housing on a cushioned ßat surface with the front facing down 2 Place the keypad into the front housing Figure 1 9 3 Place the board on the keypad in the housing Figure 1 9 Figure 1 6 Separate...

Страница 27: ...down 2 Place the board in the housing see the following Þgure 3 Place the front housing shield into the front housing using the four slots on the front housing wall as the guide see the following Þgure 4 Press down the shield at the four tabs until tabs lock into the front housing catches Chassis Reassembly 1 Place chassis on a ßat surface with the battery rails downward 2 Insert the ßexible circu...

Страница 28: ...Replace chassis gasket Figure 1 14 8 Place the chassis assembly and front housing assembly on a ßat surface with the top face of housing in a reverse and opposite direction Figure 1 15 Radio Reassembly 1 Insert the ßexible circuit tail from chassis to ZIF connector on front housing board Lock the tail in the ZIF connector by pressing down the latch NOTE Flexible circuit tail must be fully inserted...

Страница 29: ...gure 1 16 Exercise caution while inserting the volume and frequency controls through the housing top IMPORTANT The main board must be inserted into chassis Step 3 before you can secure chassis into radio housing 3 Connect microphone speaker ribbon cable 4 While pressing chassis toward the housing top press the bottom end down into the housing until the bottom housing wall snaps over the chassis re...

Страница 30: ... MHz and enters the IF circuitry The mixer operates with a LO level of 3 dBm and conversion loss is about 7 dB Intermediate Frequency IF The Intermediate Frequency IF section of the portable radio consists of several sections including the high IF the second LO the second IF and the IF IC chip The Þrst LO signal and the RF signal mix to the IF fre quency of 45 1 MHz and then enters the IF portion ...

Страница 31: ...z MOD_IN SPI_DATA SPI_CLCK PRE AMP TXB 805 9 825 MHz RF AUDIO SECTION µPROCESSOR HC11K1 SERIAL EEPROM 4K 8 DIGIT LCD DISPLAY 4 X 4 KEYPAD DISPLAY KEYBOARD DRIVER ASFIC PARALLEL BUS SPI BUS 2 1 MHz MOD_IN RX_AUDIO DET_AUDIO MIC_IN PTT MONITOR OPT LOCK_DET SYNT_EN PEND_EN SCI ROT1 ROT2 VOL_SENSE DAC_SEL RAM 8K ROM 128K LOGIC SECTION FOR FUF1190 FUF 1192 FUF1492A FUF1493A FUF1198 28 PIN CONNECTOR TO ...

Страница 32: ...LE Vcontrol COUPLER RECTIFIER ANTENNA SWITCH HARMONIC FILTER ANTENNA MATCHING POWER CONTROL POWER CONTROL REFERENCE FROM DAC TRANSMITTER BLOCK DIAGRAM RX IN µPROCESSOR HC11K1 SERIAL EEPROM 4K 8 DIGIT LCD DISPLAY 4 X 4 KEYPAD DISPLAY KEYBOARD DRIVER ASFIC PARALLEL BUS SPI BUS 2 1 MHz MOD_IN RX_AUDIO DET_AUDIO MIC_IN MONITOR OPT LOCK_DET SYNT_EN PEND_EN SCI ROT1 ROT2 VOL_SENSE DAC_SEL RAM 8K ROM 128...

Страница 33: ... P9 This DAC is controlled by the microprocessor and provides the reference voltage for the control loop The error voltage at the input of U151B 13 produces a voltage at its output which is in turn applied to the drivers Q151 Q152 The voltage from Q151 collector is applied to the controlled stage of the power module Frequency Generation Unit The Frequency Generation Unit FGU consists of the follow...

Страница 34: ... rest of the radio Some control functions it performs include loading the synthesizer with the desired RF frequency turning the RF PA on or off enabling and disabling audio and data paths and gen erating tones Operations and operating conditions within the radio are interpreted by the microprocessor and fed back to the operator as visible the display or audible alert tone indications of current st...

Страница 35: ...and selectively enabled by the microprocessor when the radio transmits or receives a signal Also there are minor differences in the func tioning of both paths depending on whether an inter nal or external accessory microphone speaker is being used The radio constantly monitors the received data path for control channel data in trunking opera tion or sub audible data in conventional operation Exter...

Страница 36: ...P7 strobing U701 G2 DTMF Clock at six times the tone frequency Inside U701 the low group and high group tones are summed with the amplitude of the high group tone being approximately 2dB greater than that of the low group tone and then pre emphasized before being routed to the summer and splatter Þlter The DTMF waveform then follows the same path as was described for high speed data MDC Data The M...

Страница 37: ... PAcircuit com ponents is helped to a low level by the low duty cycle less than 0 3 of the audio PA protection circuit The cycle repeats until the audio PA output short is removed Receive Data Circuits The ASFIC U701 decodes all receive data which includes PL DPL low speed trunking MDC and high speed trunking data The ÒdecodeÓ process for each data type typically involves low pass or band pass Þlt...

Страница 38: ...tions Operation 1 Attach the microphoneÕs accessory connector to the accessory connector on top of the radio 2 While listening to the accessory speaker turn the radio on 3 Operate radio according to operating instruc tions supplied with the radio NOTE The microphone will perform best if it is worn as shown in Figure 3 1 Handling Precautions To avoid damage to circuits observe the following handlin...

Страница 39: ...hip 680 nH 10 header 090989T02 4 pin switch S1 3905834K06 dome PTT miscellaneous MK1 0180706Y83 microphone assembly LS1 5005910P05 speaker C4 LS1 3 5 mm plug 3 5 mm plug _ S1 PTT C1 C2 C3 _ L2 L4 L1 2 5 mm plug 2 5 mm plug MK1 L3 Tip Sleeve Tip Sleeve Figure 3 2 Schematic Diagram silk nylon etc because they contribute to static buildup All electrically powered test equipment should be grounded App...

Страница 40: ...RT NO DESCRIPTION 1 1580617U01 HOUSING front 2 3580619U01 BAFFLE felt 3 0180709Y90 ASSY microphone speaker PCB 4 7580418D04 BUSHING retainer 5 3280621U01 GASKET 6 1580618U01 HOUSING rear 7 5480622U01 LABEL 8 0310945A12 SCREW thread forming 9 0484345A06 WASHER 10 3880620U01 PTT pushbutton 11 3805248Q01 ACTUATOR PTT 12 3080417E21 CORD 13 4205823V01 CLIP slide on Figure 3 3 Exploded View ...

Страница 41: ...3 4 68P02945C75 A June 1999 Accessory GTX GTX LTR LTS 2000 Portable Radios Service Manual This page intentionally left blank ...

Страница 42: ... Section 4 Troubleshooting Overview This section contains three troubleshooting tables for the following GTX GTX LTR LTS 2000 components Receiver Transmitter Synthesizer Controller Troubleshooting Charts Refer to following pages ...

Страница 43: ...a path Check external components connected to IFIC If OK replace U51 Check mixer Is Q51 biased correctely Check 5R and IF amp components Is 12 dBS 117 dBm Check ASFIC 3 7VDC at Check Q1 Check 5R 1 Is 2nd LO on freq Check VDC of all IFIC pins Are VDC of pins 7 9 and 10 of IFIC OK Are voltages on pins OK Check 2nd LO XTAL and components Check IFIC see below Check external components connected to IFI...

Страница 44: ...ng of Q400 OK Troubleshoot Power Control circuit Is Power Out of pin 4 at PA OK Is PA drive OK Is control voltage high or low Troubleshooting Flow Chart for Transmitter Start No power Is current OK Troubleshoot VCO 1 Check coupler U111 2 Check PIN diodes 3 Check harmonic Þlter Inspect repair TX output network NO NO LOW HIGH YES NO NO YES YES YES Is Tx B OK Replace PA module Replace Q400 NO Replace...

Страница 45: ...Replace U220 Remove shorts Is there a short between pin 32 and pins 9 10 of U220 Replace or resolder necessary components Is RF level at pin 20 between 10 5 dBm Are C241 C243 C245 C247 C249 C253 L246 R242 R244 and R245 OK Replace U220 If C271 and runners between U220 pin 20 U220 pin 15 are OK then see VCO troubleshooting chart Are waveforms at pins 9 10 triangular Do pins 5 6 7 of U220 toggle when...

Страница 46: ... 18 Audio problem Trouble shoot audio circuitry With power connected to radio and the radio turned on check the following 1 5 V at pin 4 of U704 and pin 71 12 31 41 of U709 2 Check for 14 7456 MHz at pin 73 of U709 3 Check DC at pin 75 of U709 If 4 5V DC check J700 pin 238 for 2 1 MHz signal 4 Check for typical voltages of U709 and U701 beep present present Done Done Done Yes Yes Yes Yes No DonÕt ...

Страница 47: ...4 6 68P02945C75 A June 1999 Troubleshooting GTX GTX LTR LTS 2000 Portable Radios Service Ma nual This page intentionally left blank ...

Страница 48: ... radio on The radio enters Test Mode operation Speaker unmutes One beep is heard to indicate operation on the Þrst test frequency default Display shows Ò4 1Ó Test Mode Channel Selection Use the PTT switch for channel selection A short press and de press on the PTT switch button like push will advance the radio to the next channel cyclical Seven channels are available during test mode as shown in t...

Страница 49: ...ormal operation Non critical errors will be temporarily indicated as described in the table below 1 For error no 7 personality system change is allowed although the illegal tone is heard For error no 8 the tem porary illegal tone is heard See the Quick Start card for instructions on how to change personality To exit fail mode power radio off Table 5 2 Test Mode Tx Modulation Modulation Type Intern...

Страница 50: ...Deviation 800 Hz but 1200 Hz Voice Modulation Internal Mode PWR MON 2nd channel test frequency atten to 70 input to RF In Out TEST MODE Display 2 0 Remove modulation input Press PTT switch on radio Say four loudly into the radio mic Measure deviation 3 8 kHz but 5 0 kHz High Speed Data Modulation Same as Above TEST MODE Display 2 2 PTT to continuous during the performance check Deviation 2 3 kHz b...

Страница 51: ...stortion Same as above except for distortion Same as Above Same as Above Distortion 5 0 Sensitivity SINAD Same as above except SINAD lower the rf level for 12 dB SINAD Same as Above PTT to OFF center RF input to be 0 35 µV Noise Squelch Threshold only radios with conventional system need to be tested RF level set to 1mV RF Same as Above PTT to OFF center meter selection to Audio PA spkr load to sp...

Страница 52: ...ain plastics Aerosol sprays tuner cleaners and other chemicals should be avoided Cleaning External Plastic Surfaces The detergent water solution should be applied sparingly with a stiff non metallic short bristled brush to work all loose dirt away from the radio A soft absorbent lintless cloth or tissue should be used to remove the solution and dry the radio Make sure that no water remains entrapp...

Страница 53: ...er bridges between the connector pins Closely examine your work for shorts due to solder bridges RF Board Main Board Replacement Procedures 1 Disassemble the radio as given in Section 1 Radio Disassembly Assembly Main Board Removal 2 Replace the old RF Board with the new one 3 Reassemble the RF Board as given in Section 1 Radio Disassembly Assembly Chassis Reassembly 4 Reassemble the radio as give...

Страница 54: ...t the temperature con trol to approximately 415û F 215û C 445û F 230û C maximum Adjust the airßow slightly above the minimum setting Apply the solder paste ßux around the edge of the OMPAC Place the circuit board in the R 1319A s circuit board holder and position the OMPAC under the heat focus head Lower the vacuum tip and attach it to the OMPAC by turning on the vacuum pump Lower the heat focus h...

Страница 55: ... add solder to the shield if necessary using a micro tipped soldering iron Next rub the soldering iron tip along the edge of the shield to smooth out any excess solder Use solder wick and a soldering iron to remove excess solder from the solder pads on the circuit board Place the circuit board back in the R 1319A s circuit board holder Place the shield on the circuit board using a pair of tweezers...

Страница 56: ...dle of any SERVICE procedure Always use the EXIT key to return to the MAIN menu screen before disconnecting the radio Improper exits from the SERVICE screens may leave the radio in an improperly conÞgured state and result in seriously degraded radio or system performance The SERVICE screens use the concept of the ÒSoftpotÓ an analog SOFTware controlled POTentiometer used for adjusting all transcei...

Страница 57: ...F2 to select ALIGNMENT TRANSMITTER RECEIVER 2 Press F5 to select the REFERENCE OSCILLA TOR softpot 3 Press F6 to key the radio The screen will indi cate that the radio is transmitting 4 Measure the transmit frequency on your fre quency counter 5 Use the UP DOWN arrow keys to adjust the reference oscillator 6 Press F6 again to dekey the radio and then press F8 to program the softpot value 7 Press F...

Страница 58: ...RVICE menu Transmit Deviation Balance Compensation Deviation Limit Compensation alignment balances the modulation sensitivity of the VCO and reference modulation synthesizer low frequency port lines Compensation algorithm is critical to the operation of signaling schemes that have very low frequency components e g DPL and could result in distorted waveforms if improperly adjusted 1 From the SERVIC...

Страница 59: ...7 4 68P02945C75 A June 1999 Radio Tuning Procedure GTX GTX LTR LTS 2000 Portable Radios Service Manual This page intentionally left blank ...

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