Re: Re: Primary Heating

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Tesla729-at-cs-dot-com>

In a message dated 3/4/02 7:23:02 AM Pacific Standard Time, tesla-at-pupman-dot-com 
writes:

Paul Nicholson  wrote:

<< and others have reported similarly.  Wonder why.  We can exclude
a localised current max in the primary at the operating frequency
because the self-cap of the primary is very small compared with
the added parallel cap of the primary tank, eg 100pF/82nF < 1%, so
that the primary current is virtually uniform [*].

David, do you have a good low-resistance connection at the inner
end of the primary?  Perhaps you can run some 60Hz AC current through
<< the primary and see if the localised heating still occurs. >>


Hey Paul, Gary, all,

Yes, I definitely have a good, solid low resistance ground connection
fron the inner primary turn (and lowest secondary turn) to RF ground.
The ground from the flattened 5/8" copper tubing is bolted against a
1/8" thick X 1" wide aluminum strip, which runs only a few inches to the 
bottom of the coil assembly and ties to a # 1/0 copper welding cable
and runs about 5 ft to the RF ground rod.

and dwp wrote:

<< I'm assuming a flat/spiral primary?>>

Yes. And I'm not even going to try to pretend that I have any answers
for why this phenomenon occurs, I'll leave the theoretical discussions
for the resident geniuses to hash out :-)

Coiling in Memphis,
David Rieben