I have been observing an intruder whose behavior is unlike anything I have seen before. It consists of a comb spectrum of CW tones in the 160m band. They pulse on and off at a regular interval. There is never any form of identification transmitted by it.
Thanks to my Elecraft P3 panadapter, I have determined that this intruder is actually composed of two distinct sets of tones that are synchronized. I have posted a YouTube video of the P3 display here: https://www.youtube.com/watch?v=-OaA1CBH_Xk. In the video you can see the display is centered on one tone at 1822.9 kHz, and it is synchronized with other tones spaced approximately, but not exactly, every 50 kHz. They all pulse on and off together. The second set of tones pulses on when the first set pulses off, and vice versa. These tones are spaced about midway between the tones in the first set. >From my QTH in eastern MA, the direction of arrival is WSW and I can hear it all night and all day. The signals are very steady with no QSB, so it must be something within groundwave distance of me. A few months ago, I posted a report of a similar intruder on 1814 kHz. I never determined what that was, and nobody else could hear it. That one has disappeared but perhaps this new one is related to it, because the direction of arrival is the same. Also both are about the same strength and audible 24 hours a day. Does anyone recognize what kind of intruder this might be? 73, John W1FV _________________ Topband Reflector Archives - http://www.contesting.com/_topband