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ALINCO 8 PIN MIC PORT TO THE BayCom

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Alinco 8 Pin Mic I/O to BayCom

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The following text provides additional information for PC comport
and radio interfacing.

If your computer comport has the 25-pin (DB25)connector rather than
the 9 pin (DE9) connector, you use an adapter cable wired as follows:
 

DB 25 Comport to the BayCom 9 pin connector
TXD   Pin 2           Pin 3
DTR   Pin 20          Pin 4
CTS   Pin 5           Pin 8
RTS   Pin 4           Pin 7
GND   Pin 7           Pin 5
 

The Radio port interface to the Baycom utilizes a 5 Pin DIN connector:

1)  Connect the mic input of the radio to pin 1 of the Baycom DIN connector.
2)  Connect the radio ground lead to pin 2 of the Baycom DIN connector.
3)  Connect the radio PTT to pin 3 of the Baycom DIN connector.
4)  Connect the radio Ext Spkr to pin 4 of the Baycom (see text below).

Connect Spkr with the speaker output of the radio.  The modem has
an input impedance of approximately 1200 ohms, if you have a speaker
output with very low impedance (4 to 16 ohms), consider adding a
parallel resistor (load) of approximately 47 to 56 ohms at 1 watt.
The resistor will provide an impedance load to the transceiver AF
output and present fairly clean receive audio to the modem.

If you use discriminator audio output to the BayCom, be sure the level
is high enough, and a series, 4 mfd capicator in the line may be
needed.