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K0CQ > RF 29.12.05 13:10l 42 Lines 1193 Bytes #999 (0) @ WW
BID : 17357_W0AK
Read: DL1LCA GUEST OE7FMI
Subj: Re: RF down a plastic spindle?
Path: DB0FHN<DB0FOR<DB0MRW<DB0FSG<I4UKI<IZ0AWG<KP4IG<VE2PKT<N1UAN<KA0MOS<
K0KCC
Sent: 051229/1040z @:K0KCC.#MO105.MO.USA.NOAM [Joplin, MO.] #:10728 $:17357_W0A
Message-Id: 17357_W0AK
From: k0kcc-8@k0kcc.#mo105.mo.usa.noam
To: rf@ww
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Message-Id: 17357_W0AK
From: kj6eo@k0kcc.#mogate.mo.usa.noam
To: rf@ww
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From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : RF@WW
Its capacitive coupling through the dielectric of the plastic
shaft. There's enough capacitance from the set screw (British
calls it grub screw) to the high voltage on the capacitor to
couple detectable RF current to your finger.
Using a nylon set screw may calm the coupling, using a longer
shaft may help. A better solution may be to set the capacitor
bach further from the grounded panel and couple in a grounded
metal shaft going through a panel bushing with a wiper or a
pigtail making sure the metal shaft is grounded.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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