Thanks Jim. I live out in the country, at least 30 miles from any high
power AM BC, so haven't had this issue or evaluated that important
capability. The little FunCube Dongle Pro+ also has filtering, but I
don't know how good it is. It covers only 192 kHz at a time, but is
16-bits, so has greater dynamic range. The SDRPlay RSP2 is probably more
useful, thanks to its greater display bandwidth.
With any of these radios, N7WS's calibration method (or something like
it) should be used. Another suggestion -- take your test setup to a spot
in the middle of nowhere -- no buildings, no power lines, no solar or
wind arrays -- and look at the noise floor there. Save those data as a
reference -- that's your objective at a new QTH.
Also, look around the area, and apply common sense. Are there houses?
Farms? Businesses? Radio towers? Cell towers? All are likely to have
dozens of noise sources, either now or in the future. My applications
note on chasing RFI talks about many of them.
73, Jim K9YC
On 8/1/2017 10:21 AM, Jim Miller wrote:
I have an RSP1 and it works well with the free software available to
do spectrum work. I particularly like HDSDR's ability to make long
term recordings.
However I found it of limited use on 160m due to AMBC interference
since it doesn't have much (or any?) front end filtering. I'm 30 miles
north of Baltimore where the AMBC originates.
I put a brickwall filter in front of it and it worked very well
afterwards.
I've recently bought an RSP2Pro which has better filtering in it which
I hope will eliminate the need for the external filter. I haven't had
time to even plug it in yet.
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