[aprssig] Re: VOX to key up sound modem

[Al Wolfe]

Jason,
    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 
control.

73,
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