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Originally Posted by basegreen
What you are hearing there is GSM interfering with the microphone. You sometimes hear this when you put a phone near to speakers or headphones.
A few things to try and a couple of questions..
1 - When this happens, are you the only person in the car, is there anyone else in there with a mobile phone?
2 -What phone do you use?
3 - I suspect the interference is made worse by the metal shell of the car, and when the phone is between your legs, your body is soaking most of the extra radiation up for you. Mmmm.. .toasty!
4 - As a little experiment, can you try putting a bunch of keys or similarly complex metal object by the phone?
5 - Have you swapped the mic over?
6 - Have you changed the mic sensitivity on the debug mode (as described on this site)
That's all for now - pretty sure we can fix this by making a very small change. I believe this problem is down to chance to an extent (to do with wavelengths and resonant frequencies)..
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1. I am the only person in the car.
2. Nokia 6310i and Motorolla something or other.
4. found another location where interference is minimum. Between the clock display and the Rev limit indicator. Keys put near phone did not make any difference.
5. The mic is in the standard left hand drive position.
6. Yes this has been altered. From low to high and vice versa. No difference.