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Strange RFI on 10 meters and 6 meters

Jun 19th, 17:12

AB3FN

Joined: Jun 5th 2007, 14:11
Total Topics: 0
Total Posts: 0
I've recently started hearing noise at approximately 57.3 KHz intervals. The noise is strongest on 6 meters, slightly weaker on 10 meters, and continues to weaken all the way down to 40 meters. This seems "backwards" to other RFI situations. I plan to swap power supplies, use ferrite cores on various lines, etc., but would welcome any thoughts. Thanks.
Jun 19th, 20:25

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0

It is likely that you have a wire that is resonant near 6 meters, hence the strongest signal on that band. A switching supply could have a strong signal on the output, but be quiet on the input, so that the power cable going to an electrical device would be an antenna, while the much longer AC mains wiring would not.

Zack Lau W1VT
ARRL Senior Lab Engineer

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