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Re: primary coil material / design



Original poster: FutureT@xxxxxxx In a message dated 10/5/06 11:41:08 PM Eastern Daylight Time, tesla@xxxxxxxxxx writes:

John,

My TT-42 coil, and my old research coil both used wire rather
than copper tubing.  The TT-42 uses solid 10awg insulated telephone
ground wire.  The research coil used fine stranded 12awg PVC
insulated wire.  Both were close wound.  Works fine for a small
coil.  Because modern coils usually use a large number of turns
in the secondary, they also need more turns in the primary.
This reduces the peak primary currents and permits a thinner
conductor to be used.

   http://hometown.aol.com/futuret/page3.html

John



Original poster: John <guipenguin@xxxxxxxxx>

Hello I am in the middle of building my first coil. I am going to be
using a 4" diameter for the increased inductance.

I see everyone uses copper refrigerator tubing.... but is there any
reason (Besides being hard to tune!) to use something like this:
<http://img82.imageshack.us/my.php?image=dcfc0002ud6.jpg>http://img82.imageshack.us/my.php?image=dcfc0002ud6.jpg

I made that test coil just for this email, it isn't enough turns, but
its just for demo. Why would this be a bad choice?


Thanks,

   John.