The noise is coming from the wal wart - a typical problem with the cheaper
ones.
for ideas on how to fix it and make it noise free, see
http://www.dxing.info/equipment/wall_warts_bryant.dx

--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D GE SRIII
BW XCR 30, Braun T1000, Sangean 818 & 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop
http://www.dxing.info/about/dxers/plimmer.dx

"zappa" wrote in message
...
I found to be spending quite a lot of money in throw away batteries using
my Sony ICF-SW7600GR portable receiver. Thus I bought a filtered
(stabilized?) power adaptor (a generic one), it works well within many
frequencies but on some of them (always AM) there's background noise and
it's impossible to listen to LW, as it makes too much noise there.

I assume it has something to do with the mains, so my question is can I do
something to filter, even more, the power cord that goes into the
receiver?

Thank you!