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[aprssig] 433 MHz operation

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed Feb 15 18:45:50 UTC 2012


So, you're not talking about selling just the Transceiver to hook to a 
TNC, but an integrated Transceiver/TNC unit that interfaces via USB to a 
PC ala the OTUSB?  Sounds nice.  Be nicer with Bluetooth so it could be 
wires-free!

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  Still hoping for that single package Tracker/Digi with Bluetooth 
serial for hooking to a full-featured client and/or IGate when 
necessary/desired.  Of course, it would have to be band and frequency 
agile and... Hey, I can dream, can't I?

On 2/15/2012 1:40 PM, Scott Miller wrote:
> Yes, when I said the OTUSB uses them transparently, I mean that they 
> behave exactly like they would for normal APRS, including KISS mode. 
> Buffering is still limited, but that will be changing - the OTUSB and 
> T3 both have RAM available for a larger outgoing packet buffer, but 
> the code needs some major changes and a lot of testing to make sure it 
> can handle transmitting continuously while it still does everything 
> else simultaneously.
>
> The current prototype boards only have a USB mini-B connector and a 
> 6-pin wafer connector for a GPS receiver, and no regular RS-232 serial 
> ports.  The PA needs a 12v supply, so they still need an external 
> power source aside from USB.
>
> Scott
> N1VG
>
> On 2/15/2012 10:29 AM, Bradley Haney 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
>> <mailto: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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