[aprssig] Re: VOX to key up sound modem

Al Wolfe awolfe at Route24.net
Wed Apr 13 16:34:00 EDT 2005

    The April QST, pg 31, has an article that you may want to check out. 
Instead of using the rig's VOX, it samples the audio from the sound card. 
After a few milliseconds of audio from the sound card it generates optically 
isolated PTT for the transmitter. Saves using up a serial port for rig 

Al, K9SI

> Date: Wed, 13 Apr 2005 08:38:59 -0500
> From: Jason Winningham <jdw at eng.uah.edu>
> Subject: [aprssig] VOX to key up soundmodem?
> To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> Message-ID: <ad29bd867f184df38756f2be7273d5e3 at eng.uah.edu>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
> A new ham brought up an interesting question: can a VOX circuit be used
> to key up the TX on a soundmodem rig, to avoid wiring another port from
> the computer?
> -Jason
> kg4wsv

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