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Re: [Discuss-gnuradio] aUaU

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] aUaU
Date: Sun, 13 Feb 2005 12:34:37 -0800
User-agent: Mutt/1.5.6i

On Sun, Feb 13, 2005 at 11:51:20AM -0800, cfk wrote:
> Well, I've gotten wfm_rcv_gui.py to run and receive one of the local FM 
> stations. I can hear spotty audio through the PC speaker and I can see a 
> series of "aUaU"'s printing out about 3 times/second. In between bursts of 
> static, I can correlate enough words to tell that I really am listening to 
> KBIG-FM at 104.3Mhz with the USRP.

wfm_rcv_gui.py doesn't use any kind of front end.  What are you using?
Piece of wire?

> So, the question being begged relates to the "aU"'s I believe. I think these 
> are overruns in data transferring twixt the usrp and my pc. The PC is running 
> an Intel i810 motherboard with a 500Mhz CPU.

The "aUaU" are "audio underruns".  The are normal.  They are a result
of two non-synchronized clocks: the USRP clock and the sound card
clock.  They are not a function of CPU speed, etc.  We could stop
reporting them if it makes people feel better ;-)

> Am I hitting a CPU wall, or with luck, just some configuration setting that I 
> dont know about yet.


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