08-02-2019, 12:38 PM
To VK4DCM:
If the rogue signal really is emanating from the FM broadcast transmitter, no amount of band-pass filtering at your receiver will remove it. That's because it's a real signal. However, I suggest what you're observing is more likely to be either a mixing product of the broadcast transmitter and some other signal, or possibly an image response in your receiver(s), in which case the band-pass cavity will certainly help deal with it.
Chas
VK3PY
If the rogue signal really is emanating from the FM broadcast transmitter, no amount of band-pass filtering at your receiver will remove it. That's because it's a real signal. However, I suggest what you're observing is more likely to be either a mixing product of the broadcast transmitter and some other signal, or possibly an image response in your receiver(s), in which case the band-pass cavity will certainly help deal with it.
Chas
VK3PY