We have exactly the same problems on aircraft...
Go here
http://www.bandcspecialty.com
for solutions... Clic on regulator.. The over voltage protection module also
highly recommended...

Denny
"Jim Spriggs" wrote in message
u...
Hi All,

If you are looking at installing a "Smart" regulator
on an existing alternator,
BE WARNED...
DO NOT BUY a Mastervolt Alpha Pro.

They produce high levels (S7 to S9) of wide-band Radio Frequency (RF)
noise.
This causes so much radio interference that it prevents reception
of most HF radio signals such as weather fax, airmail etc while
the engine is running.

So far, the dealer has suggested fixing the problem by
1: "Put the regulator in an aluminium box"
2: "cover all the leads to the alternator in alfoil"
How about that for great service ?
A better suggestion would be to drop it overboard...

When I return from cruising this season,
I'll be removing it from the boat,
and replacing it with something that works properly and doesn't
produce RF noise.

Any suggestions which SMART REGULATOR is better ?

David

(Other Keywords for searching...
MARINE RADIO NOISE,
HF NOISE,
ALTERNATOR SMART REGULATOR,
MARINE RADIO NOISE)