In article
outelectronicequipment
..com,
"Wern" wrote:

Thanks for reading this message.
Setup: Catamaran 45'
ICOM M802 with AT140 tuner, professionally installed, sidestay ant
portside
Battery Charger/Inverter Mastervolt Dakar Sinus Combi, located in engine
room s/board side.

My problem, if the Battery charger/Inverter is on, which it normaly is a
carrier every 20khz (+ -) with a 60hz humm is audible over the whole HF
spectrum. Quite strong so that weak stations are not readable. The noise
is picked up via the arial not thru the DC supply. If I disconnect the ant
the noise is gone. But just having the ant tuner connected with no ant,
the noise is audible.
I am looking fwd to some ideas how to get rid of the interference
thanks and rgds
Wern

You have to tackle this problem at the source - the inverter.

Either change to a model that properly isolates its internal switching
noise successfully, or a model that limits the noise by switching slowly
etc. As a last resort you'd use filters on inputs and outputs, assuming
the case is properly shielded.

You need someone with experience in HF and appropriate measuring
equipment - or get an inververter that is specified with respect to
emanated electrical noise.

HTH

Marc

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