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Re: Not enough pimary inductance?



Hi all,

> Original Poster: Ed Phillips <evp-at-pacbell-dot-net> 
> 
> "It is interesting to know that you have used a separate coil in series
> with
> the primary for tuning.  Didn't Tesla also do this?  I think it is
> mentioned
> in his notes.
> 
> The last part, I agree with you.  I have done a lot of work on tuning on
> my
> system.  At low power, I can tell the difference between one turn and
> even one
> half turn.  At high power, it is different.  The tap sensitivity is just
> not
> the same at say 8 kva compared to 1 kva.  I know the Q of my secondary
> should
> be high.  I used all the right materials, good construction methods,
> etc.
> These details may be way more important for small, low power systems
> than the
> high power variety.
> 
> Ed Sonderman"
> 
>     Not sure whether Tesla mentioned tuning the primary with a separate
> coil, but am sure he would have thought of it and have done so if
> convenient. 

Actually he did. He called it a "regulating coil" in the Notes. He 
also noted that performance was nearly always better with the coil 
tapped out of the circuit - a reflection of the increase in k no 
doubt. 

Malcolm
<snip>