[ct-user] Auto Mic switching

Bob Naumann - N5NJ n5nj@gte.net
Fri, 10 May 2002 21:52:16 -0500

I have a schematic for such a device posted on my website at

I do not offer these for sale, but you are welcome to use the schematic and
build your own.  Most of the parts are stock radio shack parts.

In commercial products, I would recommend the WX0B Arraysolutions SO2R box.

Bob N5NJ

----- Original Message -----
From: <kk9a@arrl.net>
To: <ct-user@contesting.com>
Sent: Friday, May 10, 2002 9:39 PM
Subject: [ct-user] Auto Mic switching

> I would like to switch a microphone/keyer relay through my parallel port
> when operating SO2R. In other words, when I'm logging on radio 1, I'd like
> the mic on radio 1 and when I switch, using alt "." ,  to radio 2 I'd like
> the mic to also switch automatically. In searching through the archives I
> found that pin 16 of LPT1 or LPT2 is used for radio switching. Does
> have a simple sketch of a circuit that I can use to build an autoswitching
> device?
> 73,
> John
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