Ranger TR-127GK/DX service manual 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. The third lead is for transmit control and the fourth is for receiving control.

The microphone should provide the functions shown in the schematic below (Figure 2-3).

4 WIRE MIC CABLE

Pin Number Mic Cable Lead

1Audio Shield

2Audio Lead

3Transmit Control

4Receive Control

Figure 2-3 Your Transceiver Microphone Schematic

Figure 2-4 Microphone plug and pin numbers viewed from rear of pin receptacle.

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