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Re: An internal primary
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- Subject: Re: An internal primary
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Thu, 07 Apr 2005 17:28:16 -0600
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Original poster: Finn Hammer <f-h@xxxx>
I have successfully used internal primary`s in 2 OLTC`s and also in 2
identical SSTC twins. So I have got 6 internals under my belt.
In OLTC`s, Solid state disruptive, there is no reason to use any
precaution. The single turn primary fits elegantly and snugly into the base
of the secondary coil.
I have had one problem with the internal primary in the SSTC. During one
unintentionally long burst, the insulation on the primary wire toasted. I
thought I had experienced a breakdown trough the secondary former material
(1/4" PVC) but after stripping the sec. wire off, inspection showed no zoot
under the windings. So the sec. was ok, still the pri. was toast.
I am going to use the internal of RG213 coax as primary wire in the future.
In pulsed mode, with bursts up to 3mS and rep rates up to 500bps, I have no
problems with internal primary even in SSTC.
Go for it! It`s sweet, easy to adjust coupling on the fly (which has been a
great asset to learning about the effect of different coupling in twin
coils, it being non intuitive) I have a nice design of an OLTC which you
can see here:
and almost at the bottom of this page, there are pictures of the twin coils
in the prototype stage.
Cheers, Finn Hammer
Tesla list wrote:
Original poster: "K. C. Herrick" <kchdlh@xxxxxxx>
Who was it who implemented an internal primary? Successfully, as I
recall. I'm thinking of trying that but perhaps that someone, or someone
else, would warn me off.