Hi again folks,
Wow, I surely do stir up a hornet's nest when I pose some of my
questions to this group.
This subject of a Faraday?Shielded Room came up when I was
trying to get this new house as protected as possible.? The almighty
dollar interfered with some of my thoughts, this being one of them.
I was suspecting that a bit less than 1/4 wave at 2 meters would have
been sufficient for such a room.
Now David has dug up a reference:
- Aperture
Aperture
An opening in a shielded enclosure that may become the source of leakage for
electromagnetic energy. This is
most common in joints, seams and penetrations such as switches, connectors, and
lamps/LEDs. Typically, the
maximum dimension of an aperture should be less than 1/20 wavelength of the
highest frequency of interest in
order to avoid emissions.
Interesting, to say the least.
The comments re: air conditioning resurrected an old experience(s).? When I was
an OIC of a STRATCOM
Receiver Site in Hawaii, we had a all copper screen room.? As Program Manager
of a Comm System in
Kuwait, we also had one.? In both cases, we did not close the door unless
absolutely necessary because
of poor air conditioning.
Then it hit me; my project engineer from USAF days has a PhD in Physics.? Think
I will
ask him if 1/20 or 1/10 is overkill.? The idea of something less than the
tightly closed
copper mesh room still intrigues me - - IF the spacing is not too small.?
Doorways and
A/C ducts probably pose the biggest problem to a "cheapo" room.
I appreciate all of the interest and the well-founded references provided so
far.
Warren; W7WY
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|