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Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
Chris Russell and I were prowling the HF bands looking for numbers stations today when he happened upon a very strange, continuously transmitting station at 5440.5Khz USB.
Its comprised of two alternating tones, each lasting approximately 1 second, and each a warbling tone that decends in frequency . It starts at the same frequency every time, and ends at the same frequency. It spans roughly 300Hz over the 1 second duration, and the high note of the two tones is seperated by about 600Hz. The station was first noticed around 0035 zulu. At 0110Z its still going, no noticeable change. There was no AM carrier present, and the lower sideband was very well suppressed.
Below is the waterfall capture of the station, with the left most edge being 5440.5Khz.
... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
Here's my spectrum, and my audio. Very interesting! I should note that my capture was taken on 5441.5khz, in USB mode. This sounds a lot like the famous backwards music/whales station, but way too regular, or at least more regular than I've ever heard. Also, this frequency isn't one known for that station.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
This wasn't extra terrestrial. I'm sure it was some sort of encrypted signal, or possibly a test signal of some sort for an FSK transmitter. We haven't heard it again since that night, but we received reports that it was heard by several European stations as well.
These strange transmissions are common on the HF bands if you know where to find them. This particular one is undocumented, however. Chris seems to be the first to discover it.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
It looks like digital time domain sharing similar to wireless phones, audio/video monitors, and networks. The 1.x GHz and 2.x GHz range is common for home automation control systems too – trouble is its unregulated in some places so very crowded. Generally low broadcast strengths limit these to a maximum of 5km line of site for most equipment (on a good day.)
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
hmm, chris did just get a new phone...
It wouldn't suprise me if that was the case, if I get my phone close to unshielded audio equipmnent (many computer/car speakers, my radio, etc) there is a decent chance that I will get a buh-buhh-buhh sound... Quite annoying sometimes
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
This signal was on 5441Khz thats 5.441Mhz, an order of magnitude and a little more BELOW any phone on the market. Any RF device can generate harmonics, but they're above the primary RF signal, not below it.
Also, this signal was heard by myself (in central Georgia) Chris (in southern Maine) and several European radio operators as well. This was not a local phenomenon..
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
a trisk of getting terribly off topic, @ madgyver You don't hear the actual 2ghz rf, but the modulation of it. The keep alive signal for the phone just happens to be strong enough that it gets picked up by the equipment and then you hear the data that they are sending on it (which is slow enough to hear it) A lot like am radio...
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Bizarre Transmission discovered
