On 03/17/2014 01:15 PM, Jon Danniken wrote:
Hi all, I picked up an SDR radio dongle, and have been playing around
with receiving. As I am playing around with it today, I am noticing
something odd (to me).

We have a college station locally that broadcasts at 88.1MHz FM. As
with many college radio stations, it has a very weak signal, but I can
just pull it in with rabbit ear antennas.

As I was poking around at ~24MHz, and I was able to pull this same
station in at 23.645MHz. Even more odd, I was getting a much better
signal at 23.645MHz than at the 88.1MHz "official" frequency.

Additionally, as I scanned around, I also found all of the other
stations doing this as well; 91.9MHz, which is too weak to tune in, I
can hear perfectly at 28.035MHz. I can also tune in to 96.1MHz at
30.240MHz, 105.5MHz at 30.325, and so forth.

So here's my question, is this something that is "normal" in radio, or
does this instead point to some peculiarity with my radio/software setup.

Thanks for any suggestions,

Jon


Now you get to experience the joy of building a crude preselector. A 20
dB pad might work, try that first.