Hello,
new user of gnuradio. I'm still running on Ubuntu 12, so I
installed a virtual Ubuntu 14.04 guest with Virtualbox, as I
couldn't get gnuradio to compile on the Ubuntu 12 system.
The virtual 14.04 install seems to run fine. I have a
nooelec NESDR smart, rtl-sdr.
I also have linrad installed on the Ubuntu 12 host, and it
is able to bring out weak CW on the 6m band. (Don't have an
upconverter, yet.) There seem to be a couple guys on 6m
that are sending slow Morse all day long, and they generally
give QUITE clear audio. The CW is just visible on the
waterfall.
So, I tried to tune them in with both gnuradio and gqrx.
Both just get noise, and I can't see the signal on the
waterfall of FFT graph. Now, one thing is that linrad is
running my rtl at 200 KS/sec, and gnuradio and gqrx seem to
"like" over 1 MHz better. If I try to select 200K Sa/sec in
gqrx, it doesn't seem to improve things any. (Changing the
sample rate in gnuradio requires some tweaking of the
decimation, so it isn't one-click away.)
Can anybody suggest some settings that help pull out the
weaker CW signals with gnuradio?
linrad works better at weak signals, but the user interface
is awful! Another thing is that linrad uses only very
little CPU resources, but gnuradio loads my i5 CPU
completely. Does that have anything to do with the virtual
environment (virtualbox) or is it just the difference in the
software?
Thanks very much,
Jon
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