[RFI] How very interesting...

[KD7JYK DM09]

: 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