[AMPS] RF Choke Forms

[measures]

>
>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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