Have a steady tone around 136.5kHz. It is definitely from my PC,
and the level was much reduced when the frame aerial was moved out into the
garden, but still I must switch off the PC when listening on certain
parts of the band.
Are you sure that the interfering signal from the PC is reaching the antenna
via the power line connection? Have you tried isolating the shield of the
antenna's coax leaden from the receiver's and house's safety ground system
by installing a isolation transformer at the receiver? This is typically 25
turns to 25 turns on a #43 ferrite core.
Bill A
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