: Worse, the SDRPlay is easily overloaded by stuff that isn't really a
: problem. I recently investigated an interference situation where the 314
: MHz +/- range was being disrupted by something which caused Key Fobs not
to
: work even when close to the vehicle they work with. The interference
source
: went away before I could pinpoint the source. I scanned the band with the
: SDRPlay and all I saw were huge signals which turned out to be the 3rd
: harmonics of 2 or 3 nearby (2 miles away) FM Broadcast transmitters. I
: wasted a couple of hours chasing those ghosts that didn't really have
: anything to do with the problem I was chasing.
Most all of the little 315 MHz garbage TX and RX have a SAW (surface
acoustic wave) filter on the board. Looks like an old flat metal can
transistor. They are a few tens of cents on ebay, get some of those to
brute force the other signals out.
Kurt
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