Re: [Discuss-gnuradio] EDACS Control Channel

[Frank Brickle]

Rick Parrish wrote:

> I think "Trunk Tracker" is a trademark of Uniden. See 
> http://www.trunktracker.com/ ...

Yes, right, sorry. It's been awhile.

> Things to be wary of the code: It was written for Borland's Turbo-C 
> compiler as a 16 bit DOS program. The size of a C "int" is 16 bits here. 
> The program assumes direct access to an 8250 compatible UART. It 
> installs it's own interrupt service routine. It uses the progammable 
> timer-counter as a time-reference.

IIRC the bitslicing code is separable from the decoding functions, and 
the 16-bit-itude isn't a huge obstacle. The hardest thing to get your 
mind around is the fact that the decoding algorithm uses the sync vector 
as a terminator, not a header. That is, it uses the sync vector of the 
(logically) upcoming frame to cue the decoding of the data from the 
current frame.

There's a lot of UI goo also, but not too hard to ignore. The guts are 
pretty straightforward.

Frank