Akula eternal lantern 4

[MarkE]

@MarkE,

Give up!

Synchro1 go ahead and explain this idea of yours.  Then maybe you can explain why it is that products are designed exactly opposite of your idea. 

[forest]

https://www.youtube.com/watch?v=aMct99DiZak

[MarkE]

That is a very good video that demonstrates a several very good points:

1) A Faraday cage attenuates, it does not completely block RF energy transfer between the input and the output.
2) Sealing off openings makes a big difference in shielding effectiveness.
3) Shielding effectiveness is multiplicative.

Something that he did not mention is that the effectiveness of a given layer of shielding is depends on:  How conductive the shield material is, how thick the shielding material is, and what frequency range of the signals one is trying to block.  A couple of mils of aluminum blocks effectively down to around 2MHz below which the image cancellation drops off rapidly.  The same thickness of copper is effective to much lower frequencies due to the higher conductivity of copper.

[forest]

MarkE


What would you propose to block EMI from 8kW radio transmitter put inside a box ?




I heard Richard Willis has such problems with EMI radiation.

[synchro1]

@MarkE,

The interior ítem has to be completely insulated from the cage to protect against the EMP. Connecting the item to the cage turns the cage into an antenna, just like connecting the item to the aluminum tray.

@MarkE,

A transistor radio with a retractable aluminum antenna would be protected while completely isolated from the cage conductor. Extending the radio antenna enough to make contact with the cage conductor would turn the cage into an antenna! Got it?