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Single, triple, and quadruple beeps on 12307kHz USB

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swl22:
Been hearing beeps for days and nights on 12307kHZ USB. I thought is was local interference, or RFID, but I am hearing it on my SDR, portables (outside and away from my home), and even on KiwiSDRs. I did some testing last night and the signal is stronger on the US SDRs. Signal is mainly single beeps, not following a pattern. Then I hear three beeps, sometimes four, then back to signal beeps. I am located on the west coast of Florida.

I can't find anything on eibispace.de or UDXF Frequency List 2024.  It almost sounds like a malfunctioning transmitter or something. Any ideas?

myteaquinn:
0106: Have it fair here in Ohio with quadruple beeps.

swl22:
Doing some monitoring of the JORN radar signals and occasionally a set of three beeps will be heard just before the radar burst. The three beeps sound identical to the three beeps I am hearing on 12307. I know Canada just purchased a JORN system from Australia, but I don't think it is operational yet. But perhaps the signal I've been hearing is related to a JORN installation?

Token:

--- Quote from: swl22 on August 04, 2025, 0128 UTC ---Doing some monitoring of the JORN radar signals and occasionally a set of three beeps will be heard just before the radar burst. The three beeps sound identical to the three beeps I am hearing on 12307. I know Canada just purchased a JORN system from Australia, but I don't think it is operational yet. But perhaps the signal I've been hearing is related to a JORN installation?

--- End quote ---

If you hear what sounds like a JORN burst, and there are 3 beeps (typically two shorts and a long) before it starts, then it is not JORN, it is most likely US ROTHR.

These pre-tones are used by several radars, most notably JORN and US ROTHR, but also at least one Chinese radar uses them.  All of the radars that use such a pre-tone can also NOT use a pre-tone, so the absence of such a tone is not indicative of which radar you are hearing, or, no tone does not indicate that you are hearing a different radar.

JORN and the Chinese radars typically use a single tone.  US ROTHR typically uses the three part (short, short, long) pre-tone, but I have also seen it use a single tone.  So, to me, when hearing a single tone I typically think JORN first, and Chinese second, but maybe US ROTHR.  When hearing the 3 tone I typically think US ROTHR.

T!

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