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Where did you buy this Sony? Are they on the web? We don't seem to be able
to find anyone selling them inthe US.
pPete Davis
poan wrote:
blockquote TYPE=CITEI have just made a sony xr ca620x installed to my
car which is a
brvolkswagen polo automatic . I had a blaupunkt before that and it had
a
brstrong noice coming from the ignition and pumps(?). I had tried to
brsolve this problem for a very long time. Visited, called and e-mailed
brvw and blaupunkt in vain. I could not solve this noise problem. I use
brMW for BBC world service in 1323 and VOA in 1260 and 792 kHz in
brIstanbul. My new sony has the same problem in MW but, suprisingly I
brhave much less noise on shortwaves which does not bother me at all.
I
brhaven't had much time yet to estimate my car radios sensitivity - I
brlistened to some weak stations from almost every band from 60 m to
16
brm tonight-. It seems as sensitive as my Sony icf 7600D, a little less
brselective then 7600D. I am very happy with my new car radio so far.
brVoice of Rusiia's jazz hour was marvellous at 22:00 in 31 m band. I
brstrongly suggest this 620x to anyone who likes to listen to sw
brbroadcasts while driving.
brregards, oan./blockquote
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Thank you Al Patrick for your nice reply:

Be sure you hood and trunk are grounded well to the main body of the
auto. This is usually done with a short piece of flexible copper web,
well secured at each end.
I have already checked it. It is grounded quite firm with a very thick
cable.

You should be able to tell the difference in ignition noise and
alternator noise, the alternator noise is more of a whine but with
varying pitch as the engine revs up. If it is ignition, you can get
resistor plugs which are supposed to help. There is also supposed to be
a resistor that can be installed for the alternator whine.
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.

It is often VERY difficult to solve. I've heard of people purchasing a
car based on how quite the radio is on MW / AM. You'd be surprised the
differences in this on new cars of the same make, model, etc.
I learned it iss very difficult by my own experience. I tried VW polo
and golf cars and produced in 2000 and 1999, some has enormous noise,
some has a little and some has no noise at all. All with their
original blaupunkt radios. Impossible to believe. And I know by heart,
I will test it's radio's MW and LW band reception obsessively before I
buy a new car, If I will.
Regards, oan

oan wrote:

s n i p

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

Quoth Al Patrick in :

You may be talking about the computer control device, often just called
the "computer". Don't know how "noisy" these can be in autos.

Pretty bad. In my 95 Buick Century, it's located behind the glove
compartment, in between the radio antenna and the radio. It REALLY messes
with weak signals.

--
"I am afeard there are few die well that die in a battle; for how can they
charitably dispose of anything when blood is their argument? Now, if these
men do not die well, it will be a black matter for the King that led them
to it; who to disobey were against all proportion of subjection." - W.S.

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