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[aprssig] RF broadcasting GPS data to local devices

Wes Johnston, AI4PX wes at ai4px.com
Fri Jun 13 03:01:06 UTC 2008


Not that I've used these modules.... but we are talking GPS data with a
checksum on the end.  It's repeating data and most devices will discard bad
packets if the GPxxx checksum fails... and as Arlo Gutherie would say... you
just "wait for it to come around on the guitar again."  Still, for use in a
small space such as an RV or car, looks fine to me.

Wes

On Thu, Jun 12, 2008 at 10:11 PM, Jason KG4WSV <kg4wsv at gmail.com> wrote:

> On Thu, Jun 12, 2008 at 9:00 PM, Wes Johnston, AI4PX <wes at ai4px.com>
> wrote:
> > Those look really slick.... $10 a pair... looks like the 315mhz models
> may
> > be the way to go... pretty far away from 70cm ham band and rx sensitivity
> is
> > better than 433mhz.
>
> The microcontroller guys that have used them complain about them being
> error-prone, and needing to implement NRZI, checksums, etc for their
> applications.  As an RS232 cable replacement, they may work as-is, but
> then again there could be some differences in $5 an endpoint and $60
> an endpoint for bluetooth. (:
>
> There's an outfit (in Canada named Abacom, IIRC) that has an audio
> version of the 433MHz module, along with a 0.5W amplifier.  I used it
> with an early version SMT OT to make a really compact APRS tracker.
> Unfortunately the SAW oscillator drifted horribly at high altitudes
> and it was scrapped.
>
> -Jason
> kg4wsv
>
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-- 
Wes
---
Where there's silence, there is no Hope.
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