>Rich said:
>
>> joints in the metal rain gutters were acting like varactor diodes
>
>More likely straight forward diodes - what is known as the 'rusty bolt
effect'.
>One cure for this is 'anti - intermodulation grease'.
>
>
>No, I'm definitely not pulling your leg! Years ago, Plessey Microwave
>Materials (long gone as a company) developed a conductive grease for the
Navy for
>coating chains and other items where loose or intermittently contacting bits
of
>metalsthat could not be bonded together. It was expensive, very conductive,
and
>formulated to be sea water resistant, both chemically and in its adhesion.
>
>(The diode nature of the loose contacts produced all sorts of nasty IM and CM
>products on ships)
>
>But you can get some very funny looks when you mention it...and before you
>ask, it only improves the performance of big amplifiers operating in a narrow
>frequency range around 27MHz!
>
/\ According to rumour, there is a CB product known as "Coax Wax®" which
reduces electron-friction in coaxial cable, thereby reducing attenuation.
>
cheers, Peter
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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