[aprssig] 433 MHz operation

Donald Jacob wb5eku at gmail.com
Wed Feb 15 12:43:08 CST 2012

Here is Southern California the band has lots going on.
Not sure if you looked at the SCRRBA band plan, but 434 seems to be in the
visual carrier TV band.

Just thought you might want to look


ps. I am going to be redoing the AMPR 44.xx.xx.xx assignments
for the area. Are you using your address, just for my info as I implement
the new addressing structrue.

On Wed, Feb 15, 2012 at 10:29 AM, Bradley Haney <kc9gqr at gmail.com> wrote:
> will we be able to possbile use these in a KISS mode?
> On Wed, Feb 15, 2012 at 12:12 PM, Scott Miller <scott at opentrac.org> wrote:
>> Hi all,
>> I've been playing with some half-watt 70 cm data transceivers lately. I'm
>> currently testing at 434 MHz, and with the standard crystal they should
>> cover about 430 to 439 MHz.  I'm not really familiar with the 70 cm band
>> plan and figured I'd check here and see if people consider that a reasonable
>> part of the band to be working in.
>> I've got another small batch of them coming soon and might start selling a
>> board based around it for people who want to experiment.  Right now I'm
>> using an OpenTracker USB variant.  It's currently running at 4800 baud with
>> some basic FEC - a (7,4) Hamming code with interleaving, not fancy but easy
>> to implement.  The transceivers will go up to 115200 bps.  When I have time,
>> I'll see if they can be made to inter-operate with G3RUH TNCs, but for now
>> I'm going to assume that won't work.
>> The really attractive part is that they're cheap - retail price should be
>> not more than 1/3 what we're selling the half-watt transmit-only 2-meter
>> modules from SRB for, and they're about the same size.
>> There are still some bugs to be worked out, but the OpenTracker USB (and
>> by extension the Tracker3) will presently work transparently with these
>> radios, doing APRS at 4800 baud with error correction.  I'll be working some
>> more on them to improve mesh routing and channel access control to try to
>> make them more suitable than vanilla APRS for short range, high rate
>> tracking applications.
>> Scott
>> N1VG
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