Re: Primary construction

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

John,

Sec of 0.75" is the diameter, not the radius. Note, this coil was tuned in 
and sparking at about 5 turns with 2nF. MCP has changed to 6nF, so the 
turns will be significantly less on a primary which already had very few 
turns to start with. Not a good situation for MCP. Correcting sec size 
using JHCTES version 3.4 has a problem. It accepts the 0.375" radius input 
for the secondary initially, but when I recalculate, this value changes to 
0.5". So there must be a size limitation built in for coils no less than 1 
inch diameter? Fres doesn't seem to be able to be solved with JHCTES v3.4 
unless there is an input error I can't seem to find.

Inca and Fantc agree with the new Javatc v10. It would be nice for program 
comparison if an Fres measurement could be made for the bare coil sitting 
on the ground as well as with primary in place. Of course, that would help 
MCP out a great deal.

Take care,
Bart


Tesla list wrote:

>Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
>
>MCP -
>
>The JHCTES Ver 3.42 TC computer program.
>
>Pri - 2.5" rad -3.5" hg
>
>Pri Cap - .006 uf
>
>Sec - .75" rad - 10.5" hg - 1000 turns - 95.24 TPI
>       5.03 mh - 392 ft lg - 3.69 uh Cself
>
>Fres = 1167 Khz - no topload
>        5.34 Pri turns - 3.1 uh
>
>Fres = 606 Khz - 10 pf topload
>        10.28 Pri turns - 11.49 uh
>
>Streamer Spark = 10"
>
>For other parameters go to
>
>     www.mgte-dot-com
>
>Click TESLA, JHCTES, Go to bottom of Book page.
>
>John Couture
>
>-------------------------------------
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Tuesday, September 16, 2003 10:04 AM
>To: tesla-at-pupman-dot-com
>Subject: Primary construction
>
>
>Original poster: The MCP <ejkeever-at-comcast-dot-net>
>
>My two new TDK caps arrived today, meaning that I now have 6nF/40Kv of tank
>capacitor. However, this obviously throws the old setup completely out of
>whack. I've been trying to get resonance again, but failed miserably.
>
>So, here are the specs:
>Secondary: .75 inch dia, 10.5 inch wound, 1000 turns, 196 feet of 32 gauge
>wire
>Primary is helical, 5 inches in diameter, with 3.5 inches vertical to work
>with
>Tank caps are 3 X 40Kv/2nF TDK caps, X-fmr is 5000/20 NST.
>
>I've tried using JavaTC at classictesla-dot-com, but it's not working. After
>giving up in it, I tried using 2, 3, 4, 6, 8, and 13 turns, none of them
>that
>much better than the other. I've got more 22 gauge wire than you want to
>know
>about and about 10 feet of .375 inch copper pipe to work with. HELP ME,
>PLEASE!
>
>PS, JavaTC says the coil resonates at 750 Khz. Is it on crack?
>
>
>
>