>
>At 09:16 AM 1/15/00 -0700, measures wrote:
>
>>As I understand it, Larry, some varieties of PVC are lossier than others.
>> The best test I found was to hang a sample of the plastic about 6
>>inches from the end of my 40m dipole. Sending ''dits'' with the
>>''Plywood Box'' amplifier, common pvc would ignite in seconds. . Oddly
>>enough, Less RF potential existed at the end of the antenna wire.
>>
>>cheers
>>
>>- Rich...,
>
>Interesting test, Rich. I will have to give that a try. (Next time I have a
>dipole!)
>
>I have had excellent results using acrylic and/or polycarbonate
(Lexan)
>materials
>as end insulators and as inslators in the anode comparment as well. Too bad
>those materials melt so easily! Another interesting material that bears a
>close look for these applications is common PVC pipe cement. When
>completely cured, this stuff is great! I use it to wx-proof the mobile
>coils. Measurements of Q before and after coating the coils show little
>difference. Does not seem to break down in the presence of RF. Don't know
>what's really in the stuff, but it "looks like" a solvent similar to
>acetone with a filler similar to polystyrene. Those are the basic componets
>of the old "Q-dope".
>
... could be Acronitrile Butydine Styrene. .
>Home Depot is a great place to shop for radio parts!
>
how true, Larry Unfortunely, the don't carry exotic materials. .
- Rich..., 805.386.3734, www.vcnet.com/measures.
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