|To:||"Tom Rauch" <email@example.com>, "Javier" <firstname.lastname@example.org>,<email@example.com>|
|Subject:||Re: [TowerTalk] Jenning Capactior question|
|Date:||Sun, 19 Dec 2004 02:32:00 -0500|
What I found is that instead I rotate the shaft there is no change at the capacitance. Is this normal, maybe because it´s the cap by itself?>>
It should still change capacity though.
In normal use the blue area (cone) what ever you call it, sets on the end of the cap. There should be a threaded rod through the cap with a tiny thrust bearing on the end of the cap so the screw (usually 1/4 28 as I recall) pulls against the cap and pulls the one half of the inside toward the cap.
As Tom says, it feels like a pretty strong spring.
Even with one that has lost the vacuum it should still be springy, but it'll stay pretty much where you put it.
I had some *big* Jennings around here for a while. Bout 14 to 16 inches long and near 6 inches in diameter with a 20 KV rating.
Roger Halstead (K8RI, EN73 & ARRL Life Member) N833R, World's Oldest Debonair (S# CD-2) www.rogerhalstead.com
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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