#### xmen205

Joined Oct 31, 2004
13

Question:mac was listening the radio , but his neighbour chris got effected by the frequency mac tuned his radio. Now can you help chris to shield his room from radio interference, the room must be enclosed in a layer of copper five skin-depths thick. If the frequency to be shielded against in 10 kHz to 1 GHz, what should be the thickness of the copper (in millimeters)? For copper, e = e0 , µ = µ0 and σ =5.8 x107 mho/m.

#### beenthere

Joined Apr 20, 2004
15,819
Hi,

Since the same RF from the radio station is present in both rooms, the interference has to be caused by the local oscillator in the receiver. If the station is FM, the IF frequency is 10.7 MHz, and some ordinary copper screen wire will do nicely, although the ideal fix is to repair the radio.

#### xmen205

Joined Oct 31, 2004
13
Originally posted by beenthere@Nov 1 2004, 07:11 AM
Hi,

Since the same RF from the radio station is present in both rooms, the interference has to be caused by the local oscillator in the receiver. If the station is FM, the IF frequency is 10.7 MHz, and some ordinary copper screen wire will do nicely, although the ideal fix is to repair the radio.
[post=3235]Quoted post[/post]​
thanx for ur response.but i have to find out the thickness of the copper wire so please help if u can