Re: Tesla Coil Blunders

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

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

Hi,

In general, I have found the streamers load a TC to about 220K ohms plus
1pF/foot of arc length.  This lowers the secondary frequency about 5 to 7%.
 MicroSim modeling also demonstrates this effect of streamer loading. 

Cheers,

	Terry


At 06:33 AM 3/29/2001 -0800, you wrote:
>more likely the detuning is due to the loading of the sparks/corona/leaders.
>Signficant C (pf/cm) and significant R (tens to hundreds of K)
>
>
>
>> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
><Mddeming-at-aol-dot-com>
>>
>> > > Original poster: "John H. Couture by way of Terry Fritz
>> > > <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>
>> > >
>> > >
>> > > Tesla Coilers may be making the worst of TC blunders when doing
>>
>>
>>
>> Hi John & All,
>>         I'm not sure that a known simplification is necessarily a
>"blunder".
>> The full original formula is:
>> f=1/2pi x sqrt(1/(LC - (R/2L)^2))
>> taking the derivative of f w/resp to R gives us:
>> df/dR=R/(f*(4*pi*L)^2)
>> For a coil ~4"  -at-270 KHz, R would have to be>500 ohms to change the
>frequency
>> even 1%. Since DC resistance is on the order of 20 ohms, the AC resistance
>> would have to be 25 times higher to be responsible for even a 1% change.
>IMO,
>> this is not the culprit.
>
>