Unidentified transmissions all across 6m?
Hey guys, hope this is the right place to ask this. I'm here in northwest mississippi, and scanning around with a very prude dipole on 6m through my 857d. I here what I believe to be psk31, turns out it was something different. I couldn't find a mode in digital master to decode it, and decided to move on, when not 200khz away, I hear it again, then again, and again. It covers the whole band at random spots. I probably counted 20ish from 50 to 51.5+. So, I began some research, listening to pre recorded identified digital modes until I came across one that was a perfect match. Differential GPS, Minimum Shift Keying. A little more research, reading what it is exactly and finally found a decoder for it. Load it up, stream the audio.. Nothing. I do a quick read on the software, make sure it's configured right, still nothing. Maybe it's not that? And, why in the world are there so many, and all across the band! The example sound I found can be heard here. Http://det.bi.ehu.es/~jtpjatae/sound.html
The most likely cause of a signal that radiates across a band is some sort of local interference. You might be hearing the baseband signal (primary frequency) or the result of some sort of mixing.
Frankly, the proliferation of digital sources making noise has made it often impossible to identify the source of signals without extensive direction finding and analysis hardware.
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I'd think it is local interference as well. I have the same on 6 meters, and a bit on 10 meters. It is almost evenly spaced, though sometimes there are gaps. It does sound a bit like PSK, though without the 'flutter'. I need to do some more investigating to try and find a source, but I suspect it is the power substation a couple blocks from here.
I also have the same thing on 6M. I also get something similar on 75m but there is sounds more like buzzing and less like a tone. Also the 75 m starts at 7am sharp!
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A lot of us have been running PSK2K on 50.230 and 144.180. It is a fairly new meteor scatter mode.
You can learn more about it here. http://www.n5tm.com/chat/HSMS_ChatRoom/
Very interesting. Its amazing how many different modes are available.
One thing I'd like to know is what makes one better than the other? Are some more reliable than the others?
How do you even decide which one to get into?
I've heard a lot of different sounds on 6m but I can't say I've ever heard anything like that. It sounds more like interference than a signal with intelligence.