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[Discuss-gnuradio] Really low sample rates for gr_sig_source_x()
From: |
Marcus D. Leech |
Subject: |
[Discuss-gnuradio] Really low sample rates for gr_sig_source_x() |
Date: |
Sat, 08 May 2010 18:13:15 -0400 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 |
It looks like when you set low sample rates (say below 1KHz), the NCO
code doesn't seem to work right,
*never* putting out samples.
I haven't done exhaustive testing.
This was prompted by Bill Pretty's issue with his flow-graph that uses a
triangle or sawtooth generator,
at low sample rates (2Hz) and low Fc (a fraction of a Hz) to drive the
tuning variable going back into
the USRP.
I tested the graph he gave, and after making a few fixes, observed that
the signal source appeared to be
never producing any output. Hmmmm.
So, I did up my own flow-graph, consisting of a signal source, a
throttle, and a number sink and scope.
It only started to work when I cranked the sample rate up to about
1KHz on the signal source.
Any ideas?
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
- [Discuss-gnuradio] Really low sample rates for gr_sig_source_x(),
Marcus D. Leech <=