charger sends "clicks" through radio to speakers..

[the_muddy_mudskipper]

i have an unorthodox LPE200 setup when i'm at home:

when my LPE sits in the charger, i have the Mic hooked to a mono 3/32'
cable that runs to a receiver powering my stereo speakers - i monitor
several channels that are being scanned this way...

unfortunately, when the LPE is at "fully charged" status and remains
in the charger, a certain pulse or "click" can be heard coming through
the stereo speakers.

this clicking is not present if the LPE remains rigged as above, but
rests outside the charger...

is there a way to choke out this "clicking" with an ferrule or similar
filter?