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Interference from plasma TV (?) dies gradually

I listen regularly on short wave, on the 160m/1.9 MHz band in the
evenings. Just recently there has been some very strong local
interference across the band  -- a continuous rasping sound -- that
completely blots out all received signals. Usually shortly after 10pm it
gradually reduces in intensity for 2-3 minutes, after which it
disappears completely.

Is this behaviour typical of a plasma TV perhaps? I would have expected
the noise to cease abruptly when switching a TV off, not gradually
diminish. Or is it perhaps something else? Ideas anyone?

--
Ian

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