[aprssig] 433 MHz operation

Scott Miller scott at opentrac.org
Wed Feb 15 15:57:56 CST 2012

On 2/15/2012 10:45 AM, Lynn W. Deffenbaugh (Mr) wrote:
> 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!

I might sell the transceivers separately for hobbyists (I don't think 
anyone stocks the 500 mW version in the states - I've only seen the 
low-power ISM version) but it wouldn't be easily connected to a normal TNC.

So yeah, it's presently an OTUSB on one side of the board and radio on 
the other.  You could replace the MCU with the T3's MCF51JM128 and have 
a Tracker3.  The code written to support the radio should compile just 
fine for the T3, but I haven't tried yet.

Either of those give you basically a single-chip USB TNC with only a few 
external components - and with this radio the interface is SPI so 
there's not even any of the usual input and output analog filters. 
Makes it easy to build small integrated systems.


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