Re: 3000 turn secondary

[FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

In a message dated 8/23/00 8:00:10 AM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

> the one thing i was thinking about is that
>  with a
>  33" primary od. 43" or so from the 30" toroid, should i use a strike ring?

Marc,

If you want, you can wind the first 15 or so turns of the primary
using 10awg close wound pvc insulated solid or stranded wire,
then attach this to the spaced 1/8" tubing for the outer turns,
and the total primary won't be so wide overall.  You'll need fewer
primary turns this way also, because the the inductance increases
when the coil is closewound.  It wouldn't hurt to use a strike rail
in any case though.

>>i  had to
>  bump the id. of the primary up to 12" for clearance, but some how the
>  inductance
>  climbed when i did this? 

This is normal, because wider coils have more inductance for a
given number of turns.

>  also, i am winding the coil with 5" dist. from the
>  topload
>  to the last turn, does anyone think this to be to much? 

The 5" may be OK, esp if the toroid is large in diameter.

>  and i found a metal  lid for
>  a pot that fit perfect into the top, see any problems with using this for 
> the
>  topload mount? or will it attract problems down the road?

As long as there's no sharp rim that might form corona, it should
be OK.

>  i'll keep all posted on this and any more input would be great,   marc

Thanks, It will be interesting, 
Cheers,
JOhn Freau

>