RE: The PING Test

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


John -

Can you give us more details on this coil and the test? What size is the
secondary, turns, etc. Where measurements made of the Q factors before and
after the turns were changed? Were other measurements made?

Do you know what the relationship is between the the surge impedance and gap
losses?

John Couture

-------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, September 27, 2002 12:32 PM
To: tesla-at-pupman-dot-com
Subject: Re: The PING Test


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

In a message dated 9/27/02 2:50:08 PM Eastern Daylight Time,
tesla-at-pupman-dot-com
writes:


>
> I agree with what you say about the continuous-wave, sinusoidal
> steady-state, conditions regarding the Q factor. However, the Q factor is
a
> pure number derived from a dimensionless ratio (wL/R) that can also be
> applied to any TC secondary coil. John Freau says tests have shown that
when
> the secondary coil turns are increased the sec voltage increases without
any
> other changes in the TC system except to retune by changing the pri coil
> taps. John, can you give us more details? This indicates the Q factor has
> been increased.



John,

The spark length can increase without the secondary Q increasing if the
gap losses are reduced by using a higher primary surge impedance.
When the primary tap is changed to tune the coil with more inductance
to match the new secondary frequency, the surge impedance
increases.  This causes more power to be transfered to the secondary.
This method can only work up to a point.  If too many turns are put
on the secondary, the wire will be too thin, and the secondary losses
will increase too much, and no benefit will be seen,

John F.