View Single Post
  #6   Report Post  
Old June 20th 07, 03:11 AM posted to rec.radio.amateur.antenna
Mike Kaliski Mike Kaliski is offline
external usenet poster
 
First recorded activity by RadioBanter: May 2007
Posts: 182
Default blocking radio waves


"merlin-7" wrote in message
...
When I build my new shack, I was thinking about lining the inside of the
plywood with something, before it is installed, that would block outside
radio transmissions inside the shack.
Mostly in the 2 meter range and higher.

Would simple aluminum foil work?

If so what frequency range could I expect it to work in?

If not any suggestions on material? The cheaper the better.

I know there is a term for a room like this but I can not rember

it..faraday
chamber?

The shack will be 12 foot by 16 foot, right next to my 60' tower, with HF
and 2m antennas on it. I have no idea how they will interact with such a
building...



Thanks
Joe


Joe,

When working with a Faraday cage, remember that safety is of the utmost
importance. Any mains voltage electrical supply fed into the cage must come
in via an isolating transformer so that the mains voltages are floating.
This will reduce the risk of electric shock if a chassis becomes live with
respect to the earthed cage. It should not be possible to reach any
'ordinary' mains powered sockets, switches or devices outside the cage area
when you are within the cage. No external mains earth should be brought into
the cage area. The Faraday cage should be provided with its own completely
separate electrical earth. Mains sockets within the cage area should not
contain an earth connection.

British Standard 7671 contains some basic details but other equivalent
legislation applies in many countries.

It's not just about slapping up some tin foil around the walls, floors and
ceiling and then strapping it to the nearest convenient earth point. Your
safety and that of others who may enter the area are paramount.

Mike G0ULI