Ranger_tr936966 Cb Tranciever_service Manual
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- 1 - TR-936 TR-966 TABLE OF CONTENTS PAGE CHAPTER 1 SPECIFICATIONS 1.0 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CHAPTER 2 OPERATION 2.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Control & Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.2 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1.3 Frequency Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.1 Procedure To Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.2 Procedure To Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 Alternate Microphones And Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 CHAPTER 3 CIRCUIT DESCRIPTION 3.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 PLL Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Receiver Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Transmitter Modulation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.4 Transmitter Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 CHAPTER 4 ALIGNMENT 4.0 Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 Alignment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.1 PLL Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.2 Transmitter Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.3 Receiver Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 CHAPTER 5 MAINTENANCE 5.0 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1 Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 CHAPTER 6 DIAGRAMS AND PART LIST 6.0 PCB Layout & Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 TR-936 CHAPTER 1
- 2 - TR-966 SPECIFICATIONS 1.0 GENERAL Model TR-936 / TR-966 Frequency Range 26.965 ~ 27.405MHz. Emission Modes TR-936 : AM. TR-966 : AM/SSB. Frequency Control Phase Lock Loop (PLL) synthesizer. Frequency Tolerance ± 0.005 % Frequency Stability ± 0.001 % Operating Temperature Range -30°C to +50°C Microphone Plug-in dynamic; with push-to-talk switch and coiled cord. Input Voltage 13.8V DC nominal ±15%. Current Drain : Transmit (AM full mod.)
- 3 - Figure 2-1 Front Panel 2.0 INTRODUCTION This section explains the basic operating procedures for the TEXAS RANGER TR-936 / TR-966 mobile transceiver. 2.1 CONTROL AND CONNECTIONS 2.1.1 FRONT PANEL Refer to the above Figure 2-1 for the location of the following controls. 1. MIC GAIN/ANF CONTROL Adjust the microphone gain in the transmit and PA modes. This controls the gain to the extent that full talk power is available several inches away from the microphone. In the Public Address (PA) mode, the control functions as the volume control. Pull this switch to activate the ANF (Advanced Noise Filter) filter circuit. This feature improves the signal to noise ratio of the receiver’s audio when receiving a marginal signal. 2. ON/OFF VOLUME CONTROL Turn clockwise to apply power to the radio and to set the desired listening level. 3. SQUELCH CONTROL This switch is used to eliminate background noise being heard through the receiver which can be disturbing when no signal is being received. To use this feature of your radio, gently turn the switch
- 4 - fully counterclockwise, and then turn clockwise until the background noise is just eliminated. Further clockwise rotation will increase the threshold level and only strong signals will be heard. 4. RF GAIN CONTROL This control is used to reduce the gain of the RF amplifier under strong signal conditions. 5. SWR CAL CONTROL This SWR CAL control allows the user to calibrate the SWR meter. 6. S-RF/CAL/SWR SWITCH In the S-RF position, the meter will indicate the strength of the signal being received, as well as the relative RF output of transmission. When calibrating the SWR meter, you need to put this switch in the CAL position. To use the meter to measure the standing wave ratio, turn the switch to the SWR position. 7. DIMMER CONTROL (TR-936) This knob controls the level of brightness for the meter lamp and channel display. MODE CONTROL (TR-966) This control allows you to select one of the following operating modes: PA/LSB/AM/USB. In the CB position, the PA function is disabled and the unit will transmit and receive on the speaker that is connected. In the PA position, the transceiver acts as a public address amplifier. Before operating in the PA mode, you must first connect an external PA speaker to the PA. SP. Jack on the rear panel. 8. TONE CONTROL (TR-936) This control changes the tone quality in receive only. In clockwise rotation, treble is increased and in counter clockwise rotation, bass is increased. CLARIFIER CONTROL (TR-966) Allows tuning of the receive frequency above or below the channel frequency by up to 1.5 KHz. Although this control is intended primarily to tune in SSB signals, it may be used to optimize AM signals. 9. CHANNEL SELECTOR This control is used to select a desired transmit and receive channel. 10. FRONT PANEL METER The Front Panel Meter allows the user to monitor signal strength, RF output power and SWR level. 11. NB/ANL/OFF SWITCH This is a three position switch. Move the switch all the way up to active the Noise Blanker (NB) and Automatic Noise Limiter (ANL). The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. When the switch is moved to the middle position, only the Automatic Noise Limiter (ANL) is engaged. Move the switch to the bottom position to turn off the ANL and NB. 12. PA/CB SWITCH (TR-936) Select the mode of operation. In the PA position, the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into PA. SP. jack on the rear panel. The radio
- 5 - does not operate when you are in the PA mode. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. CH19/OFF (TR-966) The Channel 19 switch is used for instant access to Channel 19, which is often used by truckers for transmission of traffic and weather conditions. 13. R.B./OFF SWITCH (TR-936) In the Roger Beep position, the radio transmits an audio tone at the end of your transmission to indicate that transmission has ended. As a courtesy to others, use the Roger Beep only when necessary. TONE SWITCH HI/LO (TR-966) This switch changes tone quality in receives only. In LO position, bass is increased and HI position, treble is increased. 14. CH19/OFF SWITCH (TR-936) The Channel 19 switch is used for instant access to Channel 19, which is often used by truckers for transmission of traffic and weather conditions. BRIGHT/ DIM SWITCH (TR-966) This switch controls the level of brightness for the meter lamp and channel display LED. 15. TX/RX LED The red LED indicates the unit is in the transmit mode. The green LED indicates the unit is in the receive mode. 2.1.2 REAR PANEL Figure 2-2 represents the location of the following connections:
- 7 - CHANNEL CHANNEL FREQUENCY (MHz) CHANNEL CHANNEL FREQUENCY (MHz) 1 26.965 21 27.215 2 26.975 22 27.225 3 26.985 23 27.255 4 27.005 24 27.235 5 27.015 25 27.245 6 27.025 26 27.265 7 27.035 27 27.275 8 27.055 28 27.285 9 27.065 29 27.295 10 27.075 30 27.305 11 27.085 31 27.315 12 27.105 32 27.325 13 27.115 33 27.335 14 27.125 34 27.345 15 27.135 35 27.355 16 27.155 36 27.365 17 27.165 37 27.375 18 27.175 38 27.385 19 27.185 39 27.395 20 27.205 40 27.405 2.2 MICROPHONE
- 8 - The receiver and transmitter are controlled by the push-to-talk switch on the microphone. Press the switch and the transmitter is activated, release the switch to receive. When transmitting, hold the microphone two inches from your mouth and speak clearly in a normal voice. The radio comes complete with a low impedance (500 ohm) dynamic microphone. 2.3 OPERATION 2.3.1 PROCEDURE TO RECEIVE 1. Be sure that power source, microphone and antenna are connected to the proper connectors before going to the next step. 2. Turn VOL knob clockwise to apply power to the radio. 3. Set the VOL to a comfortable listening level. 4. Set the MODE switch to the desired mode. 5. Listen to the background noise from the speaker. Turn the SQ (SQUELCH) knob slowly clockwise until the noise just disappears. The SQ is now properly adjusted. The receiver will remain quiet until a signal is actually received. Do not advance the control too far or some of weaker signals will not be heard. 6. Set the CHANNEL selector switch to the desired channel. 7. Set the RF GAIN control fully clockwise for maximum RF gain. 8. Adjust the CLARIFIER control to clarify the SSB signals or to optimize AM signals. (TR-966 only) 2.3.2 PROCEDURE TO TRANSMIT 1. Select the desired channel of transmission 2. Set the MIC GAIN control fully clockwise. 3. If the channel is clear, depress the push-to-talk switch on the microphone and speak in a normal voice. 2.4 ALTERNATE MICROPHONES AND INSTALLATION
- 9 - 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. The third lead is for transmit control and the fourth is for receiving control. The microphone should provide the functions shown in schematic below (Figure 2-3). 4 WIRE MIC CABLE Pin Number Mic Cable Lead 1 Audio Shield 2 Audio Lead 3 Transmit Control 4 Receive Control Figure 2-3 Your Transceiver Microphone Schematic TR-936 CHAPTER 3 CIRCUIT
- 10 - TR-966 DESCRIPTION 3.0 INTRODUCTION This section explains the technical theory of operation for the Texas Ranger TR-936 / TR-966 mobile transceiver. 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. The PLL circuit consists primarily of IC2, IC3, Q25, Q27, Q28 and Q29. The PLL circuit is programmed by the rotary channel switch GPS-0501. The GPS-0501 communicates the correct binary data information to the programmable divider inside of IC3. IC3 then controls the VCO (Voltage Controlled Oscillator), to oscillate on the correct frequency. This signal is fed either into the receiver’s first mixer (for receive operation) or the transmitter’s mixer (for transmit operation). 3.2 RECEIVER CIRCUIT The incoming RF signal comes into the radio via the antenna and into the front-end pre-amp, Q17. The RF signal is fed into the dual mosfet mixer circuit of Q18/Q19 and then into the AM/SSB IF section of the receiver (depending on the mode of operation). The signal is then detected by either the AM detector then product detector and then fed to the audio amplifier section of the receiver and finally out to the speaker. 3.3 TRANSMITTER MODULATION CIRCUIT (i) The transmitter modulation circuit modulates the low-level RF signal from the PLL exciter circuit with the user’s audio voice signal from the microphone. The audio from the microphone is then amplified and fed into the transmit amplifier circuit. (ii) If the transceiver is in the AM mode, the AF Power amplifier modulates the last RF amplifier, which produces a true amplitude modulated RF signal. (iii) If the transceiver is in the SSB mode, the audio signal is mixed with 10.6975MHz oscillator in IC6. (SSB function only for TR-966) 3.4 TRANSMITTER AMPLIFIER CIRCUIT The transmitter takes the basic exciter signal from the TX mixer and amplifies it through a series of amplifiers consisting of Q50, Q51, Q49 and Q47 where it is sent out to the antenna connector.