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[Discuss-gnuradio] Basic questions relating to the USRP and the TV_RX bo

From: tim
Subject: [Discuss-gnuradio] Basic questions relating to the USRP and the TV_RX board
Date: Mon, 2 Jan 2006 15:55:29 -0500 (EST)
User-agent: SquirrelMail/1.4.5

I recently purchased a USRP with a TV_RX board.  After some wrestling with
Gentoo I managed to get the board up and running and pumping audio to my
ALSA sound card.

Here are a few things that I (as a total GNU SDR newbie) can't figure out:

1) Do the TVRX programs work in the current CVS of GNU Radio?  I keep
getting a message that the module db_tv_rx (sorry I'm not on my Linux box
to give you the exact name) is missing.  I've found a tv_rx module and
even tried renaming it but then I get an array out of bounds error.  If
anyone needs specifics beyond this I can cut and paste the errors later

2) Is there an easy way to change the sampling rate of the FM demodulation
code?  It wants to output 32KHz and my soundcard only supports 44.1 KHz
and 48 KHz output. I fudged the parameters to get it close but I still get
errors and clicks and the rate is still slightly off.  These are the wfm_
python programs with the GUI.  I was hoping there was another block I
could slap in the chain that would resample for my sound card.  If not
it'd probably be worthwhile to write and I'd be willing to give it a shot.

3) In the FM demodulation program (same as above) my console streams out
"Oa" and "Ua" when the sampling rate is very far off.  What do these mean?

If there's documentation that I've missed that explains these things feel
free to tell me to RTFM or RTFC if you can point me to the right areas in
the source.  :)


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