"Steve N." wrote in message
...


Snip

The radiation will therefore mimic that noise
also. That noisy radiation will sum with the original, desired radiation.
This, in effect, modulates the radiated signal after it leaves the
transmitter. If it is sufficiently high level and the receiver able to
pick
it up, you have a problem..

Correct

Chains
are awful. We hate chains.


Gee... What's the resonant frequency for a deck chain link?


UHF or SHF, but it doesn't much matter. The training aids for the EMI
Awareness course I used to teach at San Diego Naval Station (command =
FTSCPAC, if you know that outfit) included a funky little plywood ship,
within which were two milliwatt-level HF "transmitters" and a receiver.

I/we demonstrated with two links of chain, connected back-to back to make a
continuous current path, that we could generate noise by making and breaking
the connection where the links touched. It was invariably a convincing demo
for the students. The effect only extended out a few inches from the deck
of our plywood model, but scale it up, and you are smack-dab in the real
world.

73,
John, KD6VKW
NARTE-certified EMC Engineer (retired)
USN: 1962 -1982, CTMC, EWCS (Ret.)