Hello,
I'm pretty new to sdr and just get started messing around yesterday. I found a popular FM station transmitting on 111.65 MHz that usually transmits on 107.9 MHz. Is this unusual or is it normal to find stuff like this?
Actually, after writing this, I realized as I move around the spectrum I'm looking at the frequency of this station changes. As I get closer to fm broadcast spectrum, another station shows up, and the 107.9 station shows up at multiple frequencies. What is the cause of this is? I'm using SDR# by the way.
Thanks!
WFM in Air band spectrum?
-
rtlsdrblog
- Site Admin
- Posts: 2160
- Joined: Mon Nov 19, 2012 11:54 pm
Re: WFM in Air band spectrum?
That's just imaging from the station overloading your dongle.
Strong stations will overload the 8-bit ADC on the RTL-SDR, causing images of it to show up at other frequencies. To stop that problem, reduce the gain, use filtering, or purchase a more expensive 12-bit or higher SDR.
Strong stations will overload the 8-bit ADC on the RTL-SDR, causing images of it to show up at other frequencies. To stop that problem, reduce the gain, use filtering, or purchase a more expensive 12-bit or higher SDR.
Re: WFM in Air band spectrum?
Ah, I see. Thanks for the info! I've seen FM filters on Amazon, and I'm guessing this is what those are for. Thanks again!