[ROVERNET - UK] Radio static???

Brooks restore at nbnet.nb.ca
Sun Jul 24 21:18:25 BST 2005

Thanks for the explaniation Dave...now here's one...how can one tell the 
difference....RF (aerial) or direct (dc supply).


----- Original Message ----- 
From: "Dave Read" <defender110 at ozemail.com.au>
To: <rovernet at lyris.ccdata.com>
Sent: Sunday, July 24, 2005 4:32 PM
Subject: Re: [ROVERNET - UK] Radio static???

> Dennis Brooks wrote:
> > I could see that scenario with steel...but what about aluminum ??
> Dennis
> Any "cage" of metallic earthed metal can perform this task.
> Called a Faraday cage, it is also the stuff you can see in the door of 
> your microvave oven to keep the radiation contained.
> Low permeability steel is best at shielding, but just consider, what metal 
> is often used in the "shielded" cable connecting your vehicle's antenna to 
> the radio? - Copper! (sometimes aluminium)
> The "cage" is crudely formed by the matal panels surrounding the engine 
> compartment, including the bonnet.
> You also wrote
> > Dave...doesn't the engine ground perform this function ??
> Engine grounds are important in that they provide a low resitance path 
> back to the battery to minimise earth loop induced interference due to 
> alternator, injector, computer and starter operations.
> The biggest problem with ignition is that you are trying to switch a 
> highly inductive coil on and off very rapidly.
> In short, highly inductive means "it don't wanna be turned on and off 
> quickly", and in retaliation, generates large pulses of radio frequency 
> energy.
> Cheers
> Dave
> South Oz
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