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Re: [Discuss-gnuradio] Source of annoying problem found

From: Ian Wraith
Subject: Re: [Discuss-gnuradio] Source of annoying problem found
Date: Tue, 06 Jan 2004 08:34:11 +0000

Hello Rob & Group

I can only assume that you are using a frequency that is too high for
the card. If the samplerate selected was, say 48kHz then your IF cannot
be above 12kHz. Go do some reading on subjects like Nyquist frequency
and aliasing for a better understanding.

 I should be OK Nyquist wise since I am sampling what is basically a
18 KHz waveform at 44.1 KHz. I had noticed my waveform amplitude was
varying before but in my last test this suddenly became much worse. I
now realise this was caused by me changing motherboards between these
tests. I suspect this new motherboard has a 11 KHz low pass filter
where as the old motherboard (another Asus but with a different sound IC)
had a low pass filter set at a much higher frequency.



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