Hello Jurgen,
Just a thought... try to switch the various attenuator settings (in the
Perseus sdr control panel) in and out, and watch the amplitudes
(magnitudes) of all those peaks. When stepping the attenuator by 10
(dB), but not all of those peaks change by *exactly* 10 dB, it's an
overload / intermod problem somewhere. I don't know the inner workings
of the Perseus FPGA, but if it uses integer values internally, the
'overload' problem may even be a 16-bit integer overflow somewhere.
SL internally uses floating point numbers internally, which should have
more than enough dynamic headroom.
Cheers,
Wolf .
Am 26.01.2011 17:13, schrieb pws:
Hi Jurgen,
You wrote:
Last night I started SpecLab to plot 10-72 kHz
Here is the result until 0800 local ( = 0700 ut)
http://dx.3sdesign.de/temp/Spectr-110126-0800_10-72kHz.jpg
...
Receiver kaputt?
Please compare 16-26 by 36-46 kHz in that plot. Additionally there are some
signals visible above 50 kHz never been observed by others.
Gruss aus Kiel,
Peter
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