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[aprssig] RFM22B UHF Transceiver Module

Scott Miller scott at opentrac.org
Thu Dec 13 03:43:16 UTC 2012


I need to revisit the spec and firm things up more, but yes, I still 
think this is the way to go.  It's about a hundred times easier to parse 
than APRS, and you can add all the extensions you want without worrying 
about breaking someone's implementation.

Scott
N1VG

On 12/12/2012 11:21 AM, Gregg Wonderly wrote:
> 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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>>>
>>
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