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RE: [aprssig] AO16/LO19 Uplink w ANY PC!

Yes, uplink is trivial.  THats all we need for most APRS...
DOwnlink is NOT easy.  Takes a PSK modem and SSB receiver...


On Thu, 16 Sep 1999 schoon@amgt.com wrote:

> Bob:
> 	Sounds like an interesting idea! How about no PC at all?? My off the
> cuff idea would be to use one of those basic stamps to generate the
> square wave output - yeah it's TTL, but does that matter if you're
> thinking of using the DTR on RS232?? Not sure what the downlink is, but
> if it's manchester as well, then a tap off the discriminator, couple of
> transistors or an op amp and feed the radio's output back into the
> stamp?? I've only been using the stamp for about 6 months on a remote
> sensor project, but all the commands are there as well as enough I/O
> pins to have different messages, etc. Maybe even an LCD panel - text
> only of course..... I'm really new at APRS, and still sitting on the
> side lines in SOCAL right now until I can have some free time.... Is
> this plausible??
> 73
> .mark
> =================================================
>  Mark Schoonover KA6WKE	           IS Manager
>  Trail Runner,HAM	             schoon@amgt.com
>           ka6wke@wb6dgr.#sca.ca.usa.noam  	   
>  http://www.qsl.net/ka6wke       ka6wke-1 145.05
>                Mobile: 146.52 & 28.470
>    Lat: 32.85380 Long: -117.00980 Grid: DM12LU
> =================================================
> >----------
> >From: 	Bob Bruninga[SMTP:bruninga@nadn.navy.mil]
> >Sent: 	Thursday, September 16, 1999 5:55 PM
> >To: 	TAPR APRS Special Interest Group
> >Cc: 	TAPR APRS Special Interest Group; amsat-bb@amsat.org
> >Subject: 	[aprssig] AO16/LO19 Uplink w ANY PC!
> >
> >I can't believe I didnt think of this before!  But since Manchester AX.25
> >for the UPLINK to AO16/LO19 using any FM 2m radio is a SQUARE WAVE, you
> >dont even need a sound card to generate it!  Thus, a Resistor and
> >capacitor connected to the DTR line in your serial port to your Microphone
> >jack will let you uplink to AO16/LO19 easily.
> >
> >*** IF *** someone will write the code...
> >
> >It doesnt even need to be a full AX.25 implementation.  Since all you have
> >to generate are UI packets!   Very simple...
> >
> >Anyone want to take a crack at this?  I could glue it into APRS along with
> >some satelite tracking and we would have a Mobile Satellite
> >communicator... FOR ANY 2m FM equiped mobile.
> >
> >de WB4APR, Bob
> >
> >
> >
> >---
> >You are currently subscribed to aprssig as: schoon@amgt.com
> >To unsubscribe send a blank email to leave-aprssig-8011U@lists.tapr.org
> >
> >


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