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Re: Polyethylene
Ed,
This sounded rather attractive initially...
> How about using the foam that comes in spray cans that is used for
> filling in around doors and windows? It expands like crazy and is
> quite stiff when it cures. I don't know what it is made of
> however.
The problem would be that there are pockets of trapped gas that could
ionize. The wax/poly mix sounds like a good one so I'll try that
(before stuffing it in the probe. BTW, it passed initial tests on
the weekend. I should be in a position to scope the primary before
long.
Also, I've taken some more photos off the scope but this time
with a real coil and gap. The pictures showing the effects of
progressively loading the secondary should be of interest. This was
done sparkwise with the discharge rod being moved closer for each
photo. I ran out of film before finishing :( so have more to take. I
will send them to Jim for ftp inclusion when done. The waveforms ass-
ociated with tuning the primary from above Fr to below are also
included (most interesting). You can actually see how the beat
frequencies vary in amplitude in the time domain.
There is a photo of the long linear primary decrement I captured
a month or two back and had waiting in the scope for the camera.
Including braid clearly shows up in primary Q measurements. And
raising the primary coil off the ground boosts Q markedly.
One thing that showed up clearly was how well the primary
couples to other objects in the vicinity. I was amazed to discover
that the CP gaps gave little better Q than my dry poly caps in the
rather confined metal garage. Not only that, but I clearly saw an
energy interchange between my new unearthed resonator and the primary
system with the resonator sitting *8 FEET* away!! I had to cart it
into the house so I could get meaningful primary readings and even
then, there were artifacts of some smaller resonators that were lying
around in some of the oscillograms.
Malcolm