Noise near speakers for no good reason
Printed From: the12volt.com
Forum Name: Cellular and Communications
Forum Discription: Cell Phones, Hands Free Kits, Bluetooth, Two Way Radios, CBs, Pagers, Wireless Internet, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=63467
Printed Date: June 06, 2024 at 3:18 PM
Topic: Noise near speakers for no good reason
Posted By: wikoh
Subject: Noise near speakers for no good reason
Date Posted: September 29, 2005 at 5:17 AM
If a mobile(cellular) phone does not transmit anything when idle, why does it suddenly interfere with loud speakers nearby?
Replies:
Posted By: Hornshockey
Date Posted: September 29, 2005 at 7:59 PM
mine does this if I leave it near my HU. In fact it does the same thing at home with my computer speakers, my shelf system, any audio system I've got. I'd never heard of anyone else having this problem, nobody I'd asked had ever heard of it. Can't explain it; I do notice that it gives me a 2-3 sec warning buzz throught the speakers before my phone actually rings though. So there is some benefit  ------------- Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.
Posted By: autocomjoe
Date Posted: October 02, 2005 at 8:14 PM
I don't know if this will help or not, but cellular phones do transtmit all the time. They stay in contact with the cell site all of the time in order to let the system know where they are at, and the cell site is always telling the phone what power level to operate on. TDMA (older AT&T) and GSM (CIngular) phones are worse at interference than some of the others, that's why a lighted antenna will work on a TDMA phone and not a CDMA. This isn't going to fix your problem but maybe it will shed a little light on it. Good Luck
Posted By: wikoh
Date Posted: October 04, 2005 at 2:45 PM
So new mobile phones do transmit all the time? I heard about some police story where they hoped to locate someone only if the phone could be called (then it would announce itself in response, but not otherwise)
Posted By: autocomjoe
Date Posted: October 07, 2005 at 10:38 AM
If the phone makes a call, and it is GPS capable, they can pinpoint where the phone is, but with the phone being turned on they can just tell what cell site it is locked on.
Posted By: Customautomotiv
Date Posted: October 08, 2005 at 9:38 PM
Cell phones constantly "throw" out signals to cell sites. Phones are constantly switching cell sites as you drive....GSM phones are the worse ones....autocomjoe is right in his assesment.
Posted By: hafr
Date Posted: October 09, 2005 at 9:18 AM
I do on an average of 10 v551 installs a week and 2 or 3 of them will have a terrible buz on the recieving parties side. In the car you don't hear it at all. I have changed control boxes, moved microphones, relocated speaker, and even changed ground and power connections. Does anyone know if there is a specific reason for the Buzz, I mean is it the speaker is too close to the mic, or the antenna to close to the speaker. Help rich ------------- Rich Hawthorne
Hands-Free installations
"don't talk with your hands full"
516-no-hands
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