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[Discuss-gnuradio] Aliasing on USRP N210
From: |
Roee Bar |
Subject: |
[Discuss-gnuradio] Aliasing on USRP N210 |
Date: |
Mon, 29 Feb 2016 13:31:11 -0800 |
User-agent: |
UBC ECE Webmail |
I am observing aliasing on the spectrum analyzer in the following simple
transmission scenario:
sampling freq=25M, carrier freq=12.5MHz, and a sine wave freq=-11MHz at
baseband.
I use the following command:
uhd_siggen -s 25e6 -f 12.5e6 --sine -x -11e6
I expect to see a delta at freq=1.5MHz, but there is another one
freq=26.5MHz (see attached jpeg).
It occurs on LFTX or BasicTX doughterboards. When I move the sine wave
from -11MHz toward zero, the aliasing gradually disappears. It appears
again when moving up toward +10MHz.
Why does it happen? Can I avoid it?
Thanks in advance.
alias.jpg
Description: JPEG image
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