Re: [Discuss-gnuradio] APCO 25

[Matthew Kaufman]

You have the source code to the IMBE vocoder? Or enough specification to
write one?

Once you've got that part, the rest is (relatively) easy. Unfortunately, the 
last time I poked at this problem, IMBE was patented by DVSI, and unavailable
(code OR specs needed to write your own) for this sort of application.

As far as monitoring APCO25, once an agency goes digital, there's no real
performance penalty to go encrypted. For ham use, that's not a problem.

Matthew Kaufman
address@hidden

On Jan 17, 22:44, Matt Ettus wrote:
} Subject: [Discuss-gnuradio] APCO 25
> 
> There seems to be a fair number of amateurs interested in using APCO25 (the
> heir-apparent to FM voice for police/fire/public
> safety/taxicabs/garbagemen/etc.), who are only held back by the expensive 
> radios
> (~$1k on ebay, $5k new) and repeaters (~$20k).
> 
> APCO 25 would not be that difficult to do in software, using a cheap soundcard
> as an ADC/DAC.  You could use cheap RF hardware which most hams already have.
> 
> We have all the specs for APCO25.  Is there anyone interested in trying this
> with GNURadio?  It would be a nice way to get introduced to programming with 
> it,
> and shouldn't be that hard.
> 
> Matt
> 
> 
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}-- End of excerpt from Matt Ettus