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?
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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