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intercom hookup

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geir_olav(at)c2i.net
Guest

Posted: Tue May 27, 2008 4:04 am Post subject: intercom hookup

I have a softcomm ATC-2PS intercom (panel mounted) and I have a problem to

hook this up to a ICOM A20 radio (handheld). The problem is the MIC.

The intercom works fine, but it will not transmit when I push PTT (the

display shows TX, but no audio Is transmitting). I think the problem is from

the 2.5mm MIC plug to the PTT and Intercom. The wiring diagram from ICOM and

Softcomm do not exactly shows this interface should be. Have tried GOOGLE

but no luck. Hope any of you have a experience with this.



Thanks



Geir Olav

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helili(at)chahtatushka.ne
Guest

Posted: Tue May 27, 2008 6:04 am Post subject: intercom hookup

Geir,

Most handheld solid state transceivers are keyed by grounding the MIC+

through a resistor, usually in the 10K ohm to 50K ohm range.  I think the

Icom A20 requires a 22K ohm resistor, but be careful!  You might want to

install a 50K ohm potentiometer and start with the high end resistance,

reducing in small increments until you have the desired results.  Then

replace with a fixed resistance equal to the measured potentiometer setting

that gives reliable keying. The resistor is installed in series with the PTT

input to your intercom from the handheld keying wire (usually the tip of the

plug).



John Hart

KF IV

Wilburton, OK



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