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Ranger Communications TR-127GK/DX Service Manual

40 channel am cb mobile radio
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REV. A
Dec. 2004
Communications, Inc.
TR-127GK/DX
40 CHANNEL
AM CB MOBILE RADIO
Service Manual

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Summary of Contents for Ranger Communications TR-127GK/DX

  • Page 1 REV. A Dec. 2004 Communications, Inc. TR-127GK/DX 40 CHANNEL AM CB MOBILE RADIO Service Manual...

  • Page 2: Table Of Contents

    TABLE OF TR-127GK/DX CONTENTS PAGE CHAPTER 1 SPECIFICATIONS General ..............

  • Page 3: Specifications

    CHAPTER 1 TR-127GK/DX SPECIFICATIONS 1.0 GENERAL Model TR-127GK, TR-127DX Channels Frequency Range 26.965 – 27.405 MHz Emission Modes Frequency Control Phase Lock Loop (PLL) synthesizer Frequency Stability 0.001 % Operating Temperature Range -30°C to +50°C Antenna Impedance 50 Ohms Input Voltage 13.8V DC...

  • Page 4: Introduction

    CHAPTER 2 TR-127GK/DX OPERATION 10 11 15 16 S/RF TONE CH19 TX/RX TR - 127 NORMAL RF GAIN SWR CAL CLARIFY MIC GAIN Figure 2-1 Front Panel 2.0 INTRODUCTION This section explains the basic operating procedures for the TR-127GK or TR-127DX mobile CB radio.
  • Page 5 background noise is just eliminated. Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard. Only strong signals will be heard at a maximum clockwise setting. 5. RF GAIN CONTROL: This control is used to reduce the gain of the RF (receive) amplifier under strong signal conditions.

  • Page 6: Rear Panel

    REAR PANEL Figure 2-2 represents the location of the following connections: This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device EXT.SP. PA.SP. does not cause harmful interference. +POWER− FCC ID : MEE−VX−129CN MODEL NO.
  • Page 7 2.1.3 FREQUENCY CHART CHANNEL CHANNEL FREQUENCY CHANNEL CHANNEL FREQUENCY (MHz) (MHz) 26.965 27.215 26.975 27.225 26.985 27.255 27.005 27.235 27.015 27.245 27.025 27.265 27.035 27.275 27.055 27.285 27.065 27.295 27.075 27.305 27.085 27.315 27.105 27.325 27.115 27.335 27.125 27.345 27.135 27.355 27.155 27.365...

  • Page 8: Microphone

    2.2 MICROPHONE The push-to-talk switch on the microphone controls the receiver and transmitter. Press the switch and the transmitter is activated, release switch to receive. When transmitting, hold the microphone two inches from your mouth and speak clearly in a normal voice. This transceiver comes complete with a low impedance dynamic microphone.

  • Page 9: Alternate Microphones And Installation

    2.4 ALTERNATE MICROPHONES AND INSTALLATION For best results, the user should select a low impedance dynamic type microphone or a transistorized microphone. Transistorized type microphones have a low output impedance characteristic. The microphones must be provided with a four-lead cable. The audio conductor and its shielded lead comprise two of the leads.

  • Page 10: Circuit Description

    CHAPTER 3 CIRCUIT TR-127GK/DX DESCRIPTION 3.0 INTRODUCTION This section explains the technical theory of operation for the TR-127GK or TR-127DX mobile CB radio. 3.1 PLL CIRCUIT The Phase Lock Loop (PLL) circuit is responsible for developing the receiver’s first local oscillator signal and the transmitter’s exciter signal.
  • Page 11 - 10 -...

  • Page 12: Alignment

    CHAPTER 4 TR-127GK/DX ALIGNMENT 4.0 REQUIRED TEST EQUIPMENT DC Power Supply (13.8VDC, 10A) Frequency Counter (100 MHz) RF Wattmeter (10W) RF Signal Generator (100 MHz) Multi-meter Automatic Distortion Meter Automatic Modulation Meter Oscilloscope (50 MHz) Audio Signal Generator Sinad Meter 4.1 ALIGNMENT PROCEDURES...
  • Page 13 4.1.2 TRANSMITTER ALIGNMENT ADJUST ITEM U.U.T. SETTING MEASUREMENT POINT TX Power Set radio to CH 19 AM TX mode. L26, L27, MAX > 4W Connect RF Power Meter to antenna jack. Balance Power Between CH. 1 - 40 AM TX Power Set radio to CH 19 AM TX mode.
  • Page 14 Figure 4-1 Transmitter test setup Figure 4-2 Receiver test setup - 13 -...
  • Page 15 TR-127GK/DX MAIN PCB ADJUSTMENT LOCATION - 14 -...

  • Page 16: Maintenance

    CHAPTER 5 TR-127GK/DX MAINTENANCE 5.0 PRECAUTIONS The inherent quality of the solid-state components used in this transceiver will provide many years of continuous use. Taking the following precautions will prevent damage to the transceiver. (i) Never key the transmitter unless an antenna or suitable dummy load is connected to the antenna receptacle.
  • Page 17 CHAPTER 6 DIAGRAMS & TR-127GK/DX PARTS LIST 6.0 GENERAL Information on most electrical and mechanical parts is included in the parts list. The reference designators are in alphanumeric order. - 16 -...
  • Page 18 TR-127GK/DX ROTARY SWITCH PCB (EPT092920Z) (SMD-COPPER SIDE) ( COMPONENT SIDE ) - 17 -...
  • Page 19 PART LIST: TR-127GK/DX ROTARY SW. P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT012921Z ROTARY SW PCB CHIP/F/R 0.0 Ω 0.1W R305 RCY010004Z CHIP/F/R 330 Ω 0.1W R306 RCY013314Z R307,R308,R309,R310, CHIP/F/R 680 Ω 0.1W R311,R312,R313,R314, RCY016814Z R315,R316,R317,R318, D301,D307,D316,D317, D318,D319,D320,D321, EDSS00355Y DIODE (S.M.D.) 1SS355...
  • Page 20 TR-127GK/DX DISPLAY PCB (EPT092930Z) ( COMPONENT SIDE ) ( COMPONENT SIDE ) ( COPPER SIDE ) - 19 -...
  • Page 21 PART LIST: TR-127GK/DX DISPLAY P.C.B REFERENCE RANGER PART ITEM DESCRIPTION NUMBER NUMBER EPT012930Z DISPLAY PCB D201 EX01Y40004 LED 3mm RED/GREEN LED DISPLAY EX03N40016 LED DISPLAY GREEN D202 EX01N40140 LED 3mm RED - 20 -...
  • Page 22 TR-127GK/DX MAIN PCB (EPT012910A) ( COMPONENTS SIDE ) - 21 -...
  • Page 23 TR-127GK/DX MAIN PCB (EPT012910A) ( COPPER SIDE ) - 22 -...
  • Page 24 PART LIST TR−127GK/DX MAIN PCB REFERENCE RANGER DESCRIPTION C110 CC0503915G 390PF 50WV NUMBER PART NO. C109 CC0505615G 560PF 50WV CC0500301A 3PF 50WV EPT012910Z MAIN PCB C132 CC0500602A 6PF 50WV 0 Ω 1/16W R131,132 RCM160004Z C107,129,168 CC0501004A 10PF 50WV 1 Ω 1/16W...
  • Page 25 TR3,5,9,10,11,15,19,21 T2SC00945P 2SC945P JP4,5,8,9,15,18,19,23,25,26,27 WX01070708 JUMP WIRE TR4,20,22,24 T2SA00733P 2SA733P ,56,59,61,62,64,65,66,67,68, 69,70,71,72,73,75,81,82,85, TR12 T2SC01674L 2SC1674L 86,29,101,L25 TR13 F2SK00192L 2SK192ABL JP1,2,3,7,10,17,21,22,30,31,32 WX01070710 JUMP WIRE TR14 F2SK00192R 2SK192A-GR ,35,36,37,38,39,40,55,63,87, TR16 T2SC02078D 2SC2078D TR17,28 T2SC02314F 2SC2314F JP11,20,24,28,33,57,58 WX01070713 JUMP WIRE TR18 T2SC01906Z 2SC1906 JP12,13,14,16,41,46,47,48,49 WX01070715 JUMP WIRE...
  • Page 26 TR-127GK/DX SCHEMATIC DIAGRAM...
  • Page 27 TR-127GK MECHANICAL PART DESCRITTION PART NO. QT'Y PT240N010H FRONT PANEL (GOLD) BT240N020F ID PLATE TR-127 PT2400020H KNOB A (GOLD) PT2400040H KNOB C (GOLD) PT2400050H KNOB D (GOLD) PT2400030H KNOB B (GOLD) PTDX55020A DISPLAY WINDOW (AMBER) MT3600100T D SPRING D #8500 MT3600090T D SPRING B #7800 MT240N010X...
  • Page 28 TR-127DX MECHANICAL PART PART NO. DESCRITTION QT'Y PT240N010A FRONT PANEL (CHROME) BT240N020F ID PLATE TR-127 PT2400020C KNOB A (CHROME) PT2400040C KNOB C (CHROME) PT2400050C KNOB D (CHROME) PT2400030C KNOB B (CHROME) DISPLAY WINDOW (AMBER) PTDX55020A MT3600100T D SPRING D #8500 MT3600090T D SPRING B #7800 MT240N010X...
  • Page 29 Communications, Inc. AT0127040A  COPYRIGHT 2004, Ranger Communications, Inc.

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