"Wern" wrote in message
lkaboutelectronicequipment.com...
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


If your inverter is a modified sine wave, this can make things pretty bad. I
think a pure sine wave will help alot.

I notice the issue when listening to long wave 198 for the shipping
forecast - even the GPS interferes with a ticking every second - as other
posts suggest, I will see about getting the NMEA balanced but do I just
leave the screen disconnected? any help gratefully received. I am using pro
microphone cable for sending nmea to the autopilot but what should I do with
the screen?


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