Re: Coupling & tuning

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi J.B.,

Just changing the coupling will not affect tuning.  However, if you move
the secondary to change the coupling, moving the secondary may affect the
tuning a little since you are changing the coil's dimensions in space a
little.  But it probably is not a noticeable change in any case.

If the coupling to too high, you will get racing arcs.  If it is too low,
you will loose a little streamer power (far preferable over burning up the
secondary).

In general, about 0.15 seems to work well but best just to play with it
rather than worrying with the numbers themselves.  Dr. Rzeszotarski's
program below will calculate the coupling within a percent or two.

http://hot-streamer-dot-com/TeslaCoils/Programs/MANDKV31.ZIP
http://hot-streamer-dot-com/TeslaCoils/Programs/MANDKV31.PDF

Cheers,

	Terry


At 11:57 PM 10/18/2001 +0100, you wrote:
>
>Hello Coilers,
>
>Is there a general rule of thumb that covers the interaction
>of varying the coupling and how that effects tuning?  To put
>it another way, if you increase the coupling do you decrease
>or increase the primary inductance to maintain in tune?
>
>
>73, Weazle, VE3EAR/VE3WZL
>
>Listening: 147.030+ and 442.075+
>E-mail:    weazle-at-hurontel.on.ca
>           or ve3ear-at-rac.ca
>Web site:  http://www.hurontel.on.ca/~weazle
>