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Re: LTR, STR ?

Original poster: Shad <shenderson@xxxxxxxxxxxxxxxx>

David nailed that one on the head.

However, I've found in my pig-coiling experience that an LTR capacitor
on a pole pig, when the ballast is set to allow LTR operation, gives
longer sparks than an STR capacitor at the same power setting.

Increasing the power to the pig of course increases sparklength, but
moving to LTR operation for a set amount of power almost always
increases the spark length for a pig powered coil.

An LTR cap bank for a pole pig is pretty pricey, but in my opinion, well
worth the money.  You can always change to an async spark gap, and crank
up the power so the cap is at STR levels.

For NST based coils, an LTR MMC is *the* way to go.

Also, check out the Terry Filters.  They'll save your NST.

Shad H.

On Thu, 2006-03-16 at 10:39 -0700, Tesla list wrote:
> Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> Robert,
> LTR- Larger Than Resonant
> STR- Smaller Than Resonant
> Resonance refers to the capacitance size of the primary capacitor as
> is resonates with the natural impedance of the power transfor-
> mer, which is determined by the transformer's output voltage divided
> by its rated amperage. Capacitive resonanace with the transfor-
> mer's output voltage is not a good thing, as the res. voltage can rise
> to several times what the transformer's output voltage is, which can
> destroy the transformer and/or the capacitor. This is the rea-
> son most NST powered coils are built with LTR caps nowadays.
> The larger than resonant cap limits the voltage gain in the primary
> circuit and this tends to give the most "spark for the bang" with NST
> systems, especially with a synchronous rotary spark gap
> (SRSG).
> Many pig coilers opt for an STR primary cap and fire it with a
> higher break rate through an asynchronous rotary spark gap (ARSG)
> This is mainly due to the fact that an LTR cap would have to have an
> impractiaclly large capacitance/voltage rating combina-
> tion ($$$$) to be viable for a high powered system. However,
> a few pig coilers have ventured into LTR caps with synchronous
> rotary spark gaps and have reported similar outputs as with
> an STR cap with an ARSG.
> Hope this helps.
> David Rieben
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Thursday, March 16, 2006 5:44 AM
> Subject: LTR, STR ?
> >Original poster: "R. Amaya" <dimon20042004@xxxxxxxxx>
> >Hi all,
> >Can someone please explain to me what STR and LTR means? Is there a
> >benefit to having one over the other?
> >Any comments would be appreciated.
> >  Robert