SMS wrote:
> bearclaw@cruller.invalid wrote:
>> In article <skeptic-DAAB32.20142030042007@news.announcetech.com>,
>> John Higdon <skeptic@IBOCisaCrock.org> wrote:
>>
>>> When my phone transmits, it makes a horrible buzz in my car
>>> radio...so I know when it's talking. With almost clockwork precision,
>>> I can predict when it is going to start chattering. At key places
>>> along the freeway, at certain intersections, etc., it almost
>>> invariably starts making that distinctive noise for about fifteen
>>> seconds. That has got to be draining the battery.
>>
>> That's the first time I have ever heard anyone talk about this. This
>> exact same thing happens with my Motorola Trac phone, whether or not
>> there is an incoming call. I never knew cell phones would interfere
>> with a car's audio system. I now turn the cell completely off when I'm
>> listening to the radio/tape/CD/iPod in the car.
>
> Here's a good article on it, including an explanation from Nokia.
>
> "The ever-knowledgeable Keith Nowak, spokesperson for Nokia, explains it
> as follows: "[[With GSM]] the RF transmitter is turned on/off at a fast
> rate, and that 'pulsing' is often picked up by nearby devices that don't
> have good RF shielding. In the case of GSM the pulse rate is 217 Hz,
> which can be easily heard."
>
> "http://www.smartdevicecentral.com/article/That+Crazy+GSM+Buzz/199379_1.aspx"
>
>
> According to the article, the way to avoid this problem is to switch to
> Verizon or Sprint (or one of the other CDMA carriers).


....or install shielded speaker cabling and shielded speakers with proper
grounding of the shield. Viola!

--
jer
email reply - I am not a 'ten'