[aprssig] RFM22B UHF Transceiver Module

Scott Miller scott at opentrac.org
Wed Dec 12 14:09:00 EST 2012

I've mentioned it before, but I built an OpenTracker USB / Tracker3 
board some months ago that takes the RFM12BP 500mW module.  Presently it 
runs at 4800 baud with Hamming(7,4) error correction.  I had two sample 
units out in the Black Rock desert last July for testing, but I think I 
blew the PA transistors - maybe a bad antenna connection.  If there's 
sufficient interest, I could probably make a few more.


On 12/12/2012 11:01 AM, Jason KG4WSV wrote:
> On Wed, Dec 12, 2012 at 11:59 AM, Andrew P. <andrewemt at hotmail.com> wrote:
>> Ah, but wouldn't it also be nice to have the modules compatible with the thousands of already-deployed 9600 TNC's built into every Kenwood D710?
> That was pretty much my thought.
> If I want to build something that isn't compatible, I can use Xbee Pro
> (100mW, 900MHz or 2.4GHz) or 9XTend (1W, 900MHz) and have a complete
> radio module with a serial interface.  No radio management required
> after initial configuration, power it up and feed bytes into the
> serial port.  Oh yeah, and I can have on-air data rates of up to 115k
> baud.
> If these chinese modules work out, maybe they'll be so cheap and
> convenient and useful that we (hams) won't mind building a separate
> incompatible network; it wouldn't bother me at all to be proven wrong.
>   I applaud John for doing the work to try and figure these things out.
> -Jason
> kg4wsv
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