[aprssig] ON TOPIC: aprs sound track

Scott Miller scott at opentrac.org
Thu Sep 6 10:54:54 CDT 2007

No, I thought about it but never got around to it.  I thought a lot of 
ATV'ers used a separate FM voice channel for reliability, though.

I was going to use a magnetic compass, too, but mounted to a paintball 
gun with a mic to detect firing.  I was already running around the field 
with a helmet-mounted camera and 1-watt ATV transmitter, and the idea 
was to equip players so that you'd be able to watch a live display (and 
replay after the fact) of where the players were and where they were 

It'd be amusing to see exactly how the two elements of the same team 
wound up facing each other from opposing tree lines, and how many rounds 
they fired at each other before they figured out that the enemy was 
nowhere in sight!  At least I got some good video of that.


Wes Johnston, AI4PX 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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