Jamming on PSK

I was on 15m PSK31 and in the process of calling PY3ED when a vicious jamming signal started up.

Jamming on 21MHz

As you can see, it did a good job of obliterating all signals. It seemed to be centered around 21.070MHz and extended for 50kHz or so in either direction.

I don’t know how long it stayed on for because it was lunch time so I went to have something to eat. When I came back the interfering signal had gone.

Was it something local to me or has anyone else seen it?

Julian Moss, G4ILO, is a regular contributor to AmateurRadio.com and writes from Cumbria, England. Contact him at [email protected].

4 Responses to “Jamming on PSK”

  • Harry K7ZOV:

    This might sound weird, but could it have been from the Sun? Seems to me over the years that I read about a burst in the 15 meter band range. I will do some more research…

    73…hope you are doing better and glad you are still blogging

    Harry k7zov

  • John E Mann-KK4ITN:

    No it’s QRM and I got it also. 21.130 also seems to be to be a place to jam or hold open until sked time. TOO BAD. But who ever it is must have on hell of a set of finals.

  • Fred Bernquist AE2DX:

    I myself was on 15 meters on PSK and saw and heard the same thing this morning around 14:15 utc every signal was completely blocked out. I only stayed around a short time before shutting down my equipment was strange I am in Florida.

  • Michael N5TGL:

    I’d bet it’s OTH radar.

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