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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...
bob
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
> >
> >
>
APRSdos REPLY/COMMENT:
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