x40 Radio / Speaker Interference

[matthewj]

I've not had this in the car at all, with any mobile. The TT does generate the usual noise on my PC speakers though, particularly in some orientations (when flat, face up, it seems to give a lot more noise when the side is toward the speaker than when rotated a little). It may be worth trying other positions in the car to work out where is good and where bad.

[PaulB2005]

[Belgarath]

From what I understand interference from mobiles usually happens when you have speakers that aren't magnetically shielded - which tends to be the cheaper ones - although I did have a nice Medusa/Speedlink headset which was particularly bad for this.

[PaulB2005]

So the only option is to replace the speakers?

[robbooth]

[PaulB2005]

True. Ive been working from this desk in my house for the last 6 years and my mobile is always here. I get 100% signal from my operator (i can see the mast from my window) but only get 50% signal from Vodafone. I've driven from London to Sunderland and back several times with 3 or 4 people in the car all with mobiles and none of them ever interfere with the radio / speakers like this, even with 0% coverage. I've been to clients houses and sat in front of their PC with 0% coverage, speakers on and my phone has never interfered with their speakers. I have friends who get almost no coverage here (2 operators have v poor coverage in my house - 1 bar, maybe) and their phones never interfere with my speakers. Even on the day my operator signal went dead here for 3 hours i had 4 phones on the desk all switched on with 0 bars showing and no interference with the speakers, so I'm convinced it's the unit.

I can't even find anyone on Google with similar / same problem.... I'll wait to see what TT 2nd Line Support say and then see about getting a replacement..

[PaulB2005]

Well number 2 arrived yesterday and i set everything up again. A bit less buzzy than the old one but just as heart breaking when it happens. Really liked the TT from the moment i switched it on but i can't stand the noise.

Don't think it's going to make it to the weekend....

Question. It even happens when the speakers are at their lowest settings (i.e. the volume control on the speakers makes no difference to the noise.) so i suspect changing the head unit in the car will make no difference?

[Seamaster]

Interesting. I drive a Mercedes A-Class, and my new 740 causes no interference in the vehicle whatsover. Moreover, when plugged into my Mac it causes very little interference, nothing, in fact, compared to my iPhone which drives me up the wall if it is within three feet of the Mac's speakers.

[MrT]

There is a vast difference between having an idle mobile phone on a desk showing a signal on its meter and the phone actually transmitting and receiving GPRS data. My mobiles are on my desk all day and only interfere with my PC speakers when receiving text messages or used as a GPRS modem.

The TT unit is frequently transmitting and receiving GPRS data and as such will always produce far more interference than an idle phone.

It is unlikely that the car speakers will be directly picking up the mobile signal, it is more likely to be picked up and amplified by the ICE unit.

Is is very unlikely that a fault with the TT unit would cause it to make more interference than it should. Issues that could make it appear to interfere more with car speakers include:

Amount of GPRS data transmitted.
Placement in car compared to mobile phone including polarisation effects.
Interference passes down unshielded TT power cable.
Mobile phone may be using remote/external attenna.
Relative distance from transmitter.
Mobile phone may be low power to conserve batteries.
_________________
Drivelux

[robbooth]

[PaulB2005]

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