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[aprssig] RFM22B UHF Transceiver Module

Gregg Wonderly gregg at wonderly.org
Wed Dec 12 19:21:04 UTC 2012


Once we move off of 1200baud, we really should think about using OpenTrac.  That would provide a completely clean separation which we could pivot off of, to new technologies that would make expansion and customization much more possible.

Gregg Wonderly

On Dec 12, 2012, at 1:09 PM, Scott Miller <scott at opentrac.org> wrote:

> 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.
> 
> Scott
> N1VG
> 
> 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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