Re: Isis and Osiris--Victory At See

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bert.hickman-at-aquila-dot-net>

Ralph,

Congratulations on breaking 70" in the system! It sounds like your room
is the main limiting factor in further improving the performance of your
system.

Regarding your tuning question: 
You actually have only a single primary LC circuit that just happens to
have two primary windings connected in series. Each secondary is driven
by it's mating primary winding just as in a typical 2-coil system. And,
as in a 2-coil system, maximum energy transfer from primary to secondary
occurs when the primary is driven by current that oscillates at the same
frequency as the secondary's resonant frequency. This means that the
entire primary LC circuit (with the combined inductances of the two
primaries) must be tuned to oscillate at the same operating frequency as
the matched secondaries for best performance. Ideally, your secondary
inductances, capacitive coupling to surroundings, primary inductances,
and coupling factors would also be the same. But, as you've seen, the
realities of getting the entire system in proper "balance" can be a fair
challenge... :^)  

Best regards,

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Parpp807-at-aol-dot-com>
> 
> Antoine, Ed, Nick
> 
> The Twins produced a 73 inch spark today with lots of wasted energy
> streamers coming from the toploads. The spark is more blue than white
> and it is not at all steady. A problem is that one topload is 29 inches from
> the clothes washer and both are only 27 inches below the duct work and
> conduits. I think improvements can still be made.
> 
> I have a length of bare # 12 wire, the ends of which are connected to the
> secondary bases. I can move the powerline ground tap along this wire. Now
> that the coil is decently
> tuned I am unable to find any evidence of the "ground tuning" effect. The
> electrical
> zero point does not shift. This effect was definitely noticed when I was
> tuning the
> primaries. I consider that question very much open for more experimentation.
> 
> The coupling is adjusted by sliding the secondary up and down on a smaller
> diameter
> piece of pvc. The coefficient of coupling is very high. When I checked the
> range of k
> using Terry's method the coil was untuned. But with the sec fully lowered
> into the
> primary, (a solenoid tuned from the bottom up) the high k was nearly 0.3.
> Now, with a decently tuned coil, the secs are nearly fully lowered to maximum
> k but there is no pri-sec arcing and no racers. Maybe I can reduce the
> diameter of the primaries by an inch?
> 
> The process of tuning the TWO series connected primaries to an F res = to F
> res
> for EACH secondary is a mystery to me. The secret may be in the M mutual
> inductance
> between the two primaries but I still do not understand it. Maybe Terman or
> Butterworth will help.
> 
> Happy day,
> Ralph Zekelman
> 
> As long as I can keep the sparks out of the washer and off of the ceiling,
> this beast
> may be capable of greater spark length.