MFJ-1270C/1274C MANUAL RADIO INTERFACING
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This chapter describes how to connect these signals between your MFJ TNC
and your radio and how to adjust the receive and transmit audio levels
appropriately. The interconnection should be planned so as to minimize pickup
of stray audio and RF noise by the lines. If possible, you should set up your
station with a monitor speaker and be able to operate on voice without
disconnecting the MFJ TNC .
Radio Port Connection
Use Fig. 3-2 to wire a microphone connector (not provided) to the 5 pin DIN
cable provided.
You may obtain the specific microphone connector pin designation for your
radio from the your radio's manual. Appendix A at the end of this Instruction
Manual lists pin assignments for some of the most popular radios. The accuracy
of this information is not guaranteed. You should verify this information with
your radio manual.
Fig. 3-2 Radio Port Cable with Connector
A 5-pin male DIN connector cable are provided with the MFJ TNC for wiring
to the microphone connector for your radio.
CHECK THIS CABLE WITH AN OHM METER TO IDENTIFY EACH
WIRE BEFORE WIRING IT TO THE MIC CONNECTOR THAT FITS
YOUR RADIO.
Handheld Radio Connection
Some HTs key the transmitter by drawing a small amount of current from the
microphone input pin (see Fig. 3-3 below). Radios with this type of special
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