Re: Capacitor Size and BPS

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi John,

Seems like, even with a pig, the best processed power can be had with 
a SRSG at 120 BPS and a Cp of 2.8*Cres (no different than with a 
NST).  However, the value of Cp to get this may become very expensive 
forcing many to use STR valued caps.  Given STR operation, one then 
would need to increase the BPS to get back to the processed power 
levels of LTR operation.  It would also seem that as the BPS was 
increased, gap losses and heating in the tank cap become increasing 
issues.  Would you recommend LTR operation if the cap cost was not a 
consideration??

Gerry R.

> Original poster: FutureT@xxxxxxx
> A lot of what has been written about 120 bps applies to NST powered
> coils.  Pig powered coils are more tolerant of different break rates.
> You'll want to use a rotary gap with a pig powered coil.  A pig
> powered coil can be run at 120 bps but a synchronous rotary spark
> gap will be needed, and the capacitor value will be more
> critical.  An async rotary works very nicely on a pig
> coil and has the advantage of permitting one to change the break rate
> during operation to produce interesting changes in sound and
> spark appearance.  Break rates from 250 to 400 bps are commonly
> used for async coils.  Some folks use a fixed async break rate of
> around 180 bps.
>
> John