[Discuss-gnuradio] Multimon (POCSAG/AFSK/DTMF/ZVEI) decoder

[Urs Schaufelberger]

Hello everyone!

Under the link below you can find my first attempt of porting Tom Sailer's good 
old multimon to GNURadio:

http://ignore.net/~gandalf/gr-multimon-0.1a.tgz

It should deliver POCSAG (at rates of 512, 1200 and 2400 baud), DTMF, ZVEI and 
AFSK (also at different baurates) decoders to GNURadio.

At this time, there are two python scripts:
multimon_audio.py requires input from the discriminator output of an analog 
receiver (the old school way)
multimon_tvrx.py are my attempts to use the TVRX board as RF frontend.

I'd be happy if interested people could give it a quick try and maybe help me 
getting things tuned correctly, reception via TVRX is still inferior to 
reception via analog receiver & discriminator, I suspect the decimation and 
filter settings are suboptimal..

So far, the package has only been tested with 1200 baud POCSAG transmissions 
here in Switzerland, I'd be very happy to hear from other people / coutries if 
things are working for them.

Please see the included README for details.

There's still a lot of things that need fixing, so don't consider this a 
finished package, I'm releasing a pre-alpha at this time because I would like 
to get test results from other people and maybe some help in gettings the 
filters tuned right =)

As I'm pretty new to GNURadio, please let me know what I did wrong and what 
could be improved.
Yes, I'm going to change the _ss extension to _f, as multimon really acts as a 
float sink.. (dumping the decoded output to stdout)

Thanks

Urs Schaufelberger