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Section IV Operation (Continued)
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 five-lead
cable. The audio conductor and its shielded lead comprise two of the leads. The
third lead is for receive control, the forth is for grounding and fifth is for transmit
control.
The microphone should provide the functions shown in schematic below.
5 WIRE MIC CABLE
Pin Number Mic Cable Lead
1 Audio Lead
2 Audio Shield
3 Receive Control
4 Grounding
5 Transmit Control
Fig. 1. Cobra 2010 GTL WX microphone schematic.
If the microphone to be used is provided with pre-cut leads, they must be revised
as follows.
1. Cut leads so that they extend 7/16” beyond the plastic insulating jacket of the
microphone cable (see Fig. 2.)
2. All leads should be cut to the same length. Strip the ends of each wire 1/8”
and tin the exposed wire.
Before beginning the actual wiring, read carefully, the circuit and wiring informa-
tion provided with the microphone you select. Use the minimum lead required in
soldering the connections. Keep the exposed wire lengths to a minimum to avoid
shorting when the microphone plug is reassembled.
Section VI Appendix (Continued)
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