Gadgets Manual

General Transmitter Receiver CHAPTER 2 OPERATION 2.0 Introduction Control & Connections Microphone Operation Alternate Microphones And Installation CHAPTER 3 CIRCUIT DESCRIPTION 3.0 Introduction PLL Circuit Receiver Circuit Transmitter Modulation Circuit Transmitter Amplifier Circuit CHAPTER 4 ALIGNMENT 4.0 Required Test Equipment Alignment Procedures CHAPTER 5 MAINTENANCE Precautions Periodic Inspection Fuse Replacement CHAPTER 6 DIAGRAMS AND PARTS LIST 6.0 PCB Layout & Parts List TR-127GK/DX CHAPTER 1 SPECIFICATIONS 1.0 GENERAL Model Channels Frequency Range Emission Modes Frequency Control Frequency Stability Operating Temperature Range Antenna Impedance Input Voltage Antenna Connector Dimensions Weight TR-127GK, TR-127DX 40 26.965 – 27.405 MHz AM Phase Lock Loop (PLL) synthesizer 0.001 % -30°C to +50°C 50 Ohms 13.8V DC Standard SO-239 type 7 1/4”(W) x 9”(D) x 2 1/4”(H) 3.4 lbs.

1.1 TRANSMITTER RF Power Output RF Transmit Modes Spurious Emissions Audio Frequency Response Microphone Output Indicators AM : 4 watts AM - 60dB 300 to 2500 Hz Dynamic Meter shows incoming signal strength, RF output power, and SWR level. Transmit LED glows red when transmitter is in operation. 1.2 RECEIVER Sensitivity For 10dB S/N IF Frequency Image Rejection Adjacent Channel Selectivity RF Gain Control Automatic Gain Control (AGC) Figure Of Merit Squelch Noise Blanker Audio Output Power Audio Frequency Response Built-in Speaker External Speaker (Not Supplied) < 1.0µV AM: 10.695 MHz 1st IF, 455 KHz 2nd IF - 50dB - 60dB 45dB adjustable for optimum signal reception 100mV for 10dB Change in Audio Output Adjustable; threshold less than 0.5µV RF type 2.5W @ 10% THD 300 to 2500 Hz 8 Ohms, 4 Watts 8 Ohms, 4 Watts Front Panel 2.0 INTRODUCTION This section explains the basic operating procedures for the TR-127GK or TR-127DX mobile CB radio. 2.1 CONTROLS AND CONNECTIONS 2.1.1 FRONT PANEL Refer to the above Figure 2-1 for the location of the following controls. 1. MICROPHONE JACK: Used to connect microphone for voice source. 2. MIC GAIN 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 function as the volume control. 3. ON/OFF VOLUME CONTROL: This knob controls the volume and power to the radio. To turn radio on, rotate the knob clockwise. Turning the knob further will increase the volume of the receiver. 4. SQUELCH CONTROL: This knob is used to eliminate background noise being heard through the receiver, which can be disturbing when no transmissions are being heard through the receiver.

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