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!

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!

If the radio uses AA batteries and you want to use rechargable
batteries,Ray O Vac www.rayovac.com makes some rechargable
batteries that recharge in about 15 minutes.I have always used Ray O Vac
batteries whenever available.Eveready batteries are very good too.
cuhulin

On Sun, 25 Sep 2005 21:23:25 +0200, "zappa"
wrote:


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!


I use NiMH batteries in everything portable.

I use my tabletop receivers at home.

DaviD - my, My. MY ! - You are Seeing Fascist Everywhere.
- - - WalMarts
- - - Home Depots

FDR - Wow ! So 'you' See Communist Everywhere !
Including the same WalMarts that DaviD sees Fascist.
FDR and DaviD - It's A Small World After All ! ~ RHF

Most new older style rechargable batteries need to be conditioned first
before regular use.They should be fully charged up and then put in a
flashlight and leave the flahlight turned on untill the batteries
completly drain down and do the same thing again a couple of times or
otherwise they will devlope a memory and will not fully recharge
again.Once a month,they should be fully drained down again and fully
recharged at least once to keep them in good working condition.NiMH and
some other types of rechargable batteries are different and do not
develope a memory.Always read the instructions that came with the
rechargable batteries or the battery charger.
cuhulin

"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!


Hi Zappa

When I bought my Lowe HF-150, it needed 8 batteries to power it for outside
use. There was no way I was going to buy batteries every couple days for it.
So, I bought this 8 way battery recharger and picked up a deal on 20 or 24
2100Mah batteries for it. The 2100's were the not the best, 2300 was the
best at the time, but I found the 2100 to be just as good for the money.

I figured out the premium for the 2300s over the 2100s were not worth it.
But this was like 6 months ago. I'm sure prices have changed since then.

Not that much longer lasting power in the 2300s over the 2100s for me
anyway.

Check out this guys store. He has LOTS of rechargers and battery combo
deals. I bought my 8 way recharger on it's own. Don't know if he still lists
the recharger alone anymore. But still, take this auction for instance. It's
not a bad deal. It charges both cads and NiMH's.
5 hours for cads, 8 hours for Nih. So charge 4 while you're using the other
4. He also has, 4 and 10 way rechargers and various others.


http://tinyurl.com/9atdp

Lucky

In article ,
zappa wrote:
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?

Try hooking the receiver chassis up to an earth ground. If it's
just a two pin plug on the wall wart, the receiver is floating, ie.
connected via stray capacitance to all the crud coming in over the
power line.

The battery clip on the ground end, or the outside of an earphone or
antenna jack are places to try. (I don't have that radio, anybody
have a service manual and can make a better suggestion?).

Mark Zenier
Googleproofaddress(account:mzenier provider:eskimo domain:com)