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18. Apr 2018
Improves across the entire spectrum when scanning with AirspyR2
Using the Airspy R2 near a FM-radio broadcast antenna, I had lots of interference from FM-radio signals.
The CB-band had large spikes all over it. The airband had large spikes all over it. On many different places, across the entire receivable spectrum, the FM-spikes would show.
The FM-filter is very efficient and has opened up the bands that were previously closed.
It begins a slow fade from full-pass at 80 MHz to max-stop at 84 MHz.
Continues max-stop to 114 MHz and is back up to full-pass at 118 MHz.
So max-stop is between 84-114 MHz, although the filter has a dampening effect from 80-118 MHz.
It has no ill-effects on the reception of airband-communication (But the nav-part of the airband is obviously affected (But no talk is at that band, so that shouldn't matter to many)
The only thing I missed on the box, was a clear indication of which input to hook up to the antenna and which input to hook up to the SDR (in and out markers or a tiny flow-diagram or some other kind of indication of what is input and output)
(Turns out the FM-filter has a left-to-right orientation (Going in the direction from antenna to computer), relative to the printed text on the top of the black box, where the AirspyR2 has a right-to-left orientation relative to its printed box-text.)
Works great :)
JEL