chrismyers2000
Member
- Joined
- Feb 12, 2014
- Messages
- 19
No, no, I'm not trying to get internet over CB radio. I had a good laugh while googling the topic. I was listening to the 10m band with my rtl-sdr and noticed some strange signals just below 28.000Mhz. I saw the same signal pretty much all over the upper portion of the CB band. For the most part, the signals are prefaced with a short tone burst, - - - similar to the letter O in morse code. After that an 8 khz wide data burst starts and lasts for only about 4 seconds. They don't seem to repeat with any consistency and they seem to be slightly different every time.
Any ideas as to what they are or where they could be coming from? My only conclusive thought was maybe they're just ghosts or resonant frequencies from a nearby transmission, but I have yet to see them anywhere else between 24mhz and 1600mhz.But I know these dongles don't have the best rf filters (if any).
side note:
I've shielded my sdr dongle the best I can with tinfoil and placed that inside an aluminum project case. The USB cable also has 4 snap-on RF chokes.
Any ideas as to what they are or where they could be coming from? My only conclusive thought was maybe they're just ghosts or resonant frequencies from a nearby transmission, but I have yet to see them anywhere else between 24mhz and 1600mhz.But I know these dongles don't have the best rf filters (if any).
side note:
I've shielded my sdr dongle the best I can with tinfoil and placed that inside an aluminum project case. The USB cable also has 4 snap-on RF chokes.