You helped me so much. I don't know how to thank you. I shielded the
computer of my car with an aluminum foil as you adviced and it helped
a great deal. I can listen to BBC WS on 1323 kHz clearly now. Thank
you very very much Al...

You might also look into shielding the radio and/or antenna lead in
wires from the interference.
noise is coming from ignition and there is another continious noise i
couldn't find the origin. There is somthing the technicians call
"brain" here in Istanbul, I don't know what is it called in English.
It seems that the noise is coming from that part. by the way,
alternator already has a resistor.

You may be talking about the computer control device, often just called
the "computer". Don't know how "noisy" these can be in autos. I do
know that my computer and/or monitor in the house causes LOTS of
interference on MW and some of the lower shortwave bands. Often I'll
shut the computer and monitor down if there's a program I really want to
hear and don't need the computer right then.

Hope you are able to locate - and fix - the problem.

Oh, If your problem is noise from the computer you might check to see if
there is a way to shield the computer with aluminum foil or other metal.
You might also look into shielding the radio and/or antenna lead in
wires from the interference.

Are you using resistor type ignition wires? This might help cut down on
the ignition noise.

One last thing. Are you sure it's on the INPUT side of the radio? It
might be coming in on the speaker wires, often unshielded, after it
leaves the radio and before getting to the speakers. Just a thought. I
haven't heard anyone say if they've had this problem. (The input signal
would be so much weaker that it most likely is coming in on the input
side of the radio, but who knows?)

Let us know what you found if you're able to get it fixed.

Al