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[aprssig] ON TOPIC: aprs sound track

Andy Gonzales kg6rwo2 at gmail.com
Fri Sep 7 19:45:21 UTC 2007


APRS audio tones are adaptable to any band. I was going to use the audio
side of a 2.4 GHz TV stream to transmit APRS for a NASA test of a Mars
airplane prototype flying at 30 km altitude. We didn't do the test but I
mocked up the system and demonstrated it at my club's (PAARA, in Menlo Park,
CA) field day operation in 2006.

Andy
KG6RWO

On 9/6/07, Wes Johnston, AI4PX <wes at ai4px.com> wrote:
>
> Anyone ever send 1200baud positions from a tiny trak into the audio input
> of an ATV transmitter?  I figure some of you rocket or RC airplane guys
> have.  I got a neat idea the other day.  Mount the GPS to the top of a
> camera.  Use the magentic compass on some of the fancier GPS units to show
> the direction a camera is pointing (not the gps calculated heading).   If we
> fed the audio from an ATV reciever into a TNC, we could use an aprs client
> to show where the video was coming from.  Ideally, you'd end up with an icon
> on the screen with a red line coming out of it indicating the fake heading
> (orientation of camera).  The point to this is to have a camera that can pan
> around on a mobile platform.  Now imagine using a nice map like google maps
> or teraserver photos to show the location of the plane...
>
> Wes
>
> PS Funny how we accept a DECIMAL money system (can any Americans imagine
> paying for something in 1/8fractions of a dollar or pound), but we can't
> accept measuring in 1/10ths 1/100ths or 1/1000ths of a meter (yard)?
> sheesh.  American engineers figured that whole 10's thing out years ago.  My
> wife's grandfather gave me a tape measure that is marked in 1/10s and
> 1/100ths of a FOOT from when he was in WWII.
>
> --
> In theory there is no difference between practice and theory.
>
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>
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