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[Discuss-gnuradio] Aliasing Question

From: jonshan
Subject: [Discuss-gnuradio] Aliasing Question
Date: Tue, 10 Jul 2007 19:47:15 -0400 (EDT)
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I don't know if this is intended behavior or not.

I am running ./usrp_siggen -f10e6 -w150k -i256
At the receiver, I am running ./usrp_fft.py with -f9.8e6, -d128
I see a peak at -150k.

According to my calculations,
(10e6 + 150k) - 9.8e6 = 350k. This is outside the Nyquist interval (-250k,
250k). Thus it gets aliased: 350k - 500k = -150k. Which seems to explain
the peak.

However, is this intended behavior? The magnitude (20dB) of the peak is
smaller than usual, compared to when I set center freq to 10e6 (>45dB). I
am uncertain.

Jonathan Shan

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