Heatmap with unwanted vertical lines
john at tonebridge.com
Sat Jul 11 17:29:55 UTC 2015
When I use heatmap.py with output from rtl_power I get regularly spaced
vertical lines that do not appear to be related to any signal. They
look they like repeat at the dongle bandwidth (2048000Hz in this case).
The crop option for rtl_power reduces the presence but I am not sure f
that is intended by that option. Even at -c of 70% they are still there
Is this because of small bin width? If I use a larger bin (32k) they
are still there. In this case there is no frequency legend along top so
can't compare if they happen more often.
Are these lines to be expected?
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