[Premium-Rx] Radios and High RF powers

[J. Forster]

Larry Gadallah wrote:

> Hello all:
>
> I've heard of schemes to deal with this that use some sort of conductive
> conduit ....

> The term I've seen used is "waveguide beyond cutoff", which I think refers to
> the fact
> that below (or above) a certain frequency (again, based on the geometry),
> a waveguide will not propagate signals.

Actually "waveguide below cutoff"....  If you try to propagate a wavelength
longer than a WG can support down the guide it becomes a strong, and very
predictable, attenuator.

AIL (Eaton) uses this trick in their super precision 60 MHz variable
attenuators. A few inches of 1" pipe will effectively not pass an radiation frm
a microwave oven out of the interior space.

-John