Weird Stuff

Discussion in 'Working Different Modes' started by K9AAN, Mar 5, 2012.

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  1. AA5CT

    AA5CT Ham Member QRZ Page

    Hmmm ... seeing what appears to be 3rd and 5th and 7th etc. order IMD products of the 'main' signal in those screen captures, from whatever the source may be (SMPS?) ...

    Doppler from aircraft are easy enough to spot (appear as 'bananas' esp. using WSPR with a 2 min. cycle time), but the 'carriers' in the above screen capture all bear similarity to each other with what looks an integer multiplicative factor relating them, plus the 'sweep' becomes magnified (think integer multiples of the difference btw the 'carrier' and the 1st sideband) the further away the higher order product is to the right of the 'main' signal.

    Now the question is, what created the original 'carrier'? SMPS would be my off-handed guess ... I had a slow 'sweeping' carrier show up on the WSPR display last week while receiving in the 600m (475 kHz) band last week ... unknown source at this point but bets point towards a nearby terrestrial SMPS there too.

    73, Jim WB5WPA
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