[Amps] Winding large inductors

[Dan Hearn]

Dennis, I have heard of people filling the tubing with sand to prevent it
from kinking. I would think you could push or pull on the end of the
inductor to adjust turn spacing. How about using small nylon cord wound with
the tubing to approximate the spacing you want?
73, Dan, N5AR

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of Dennis Ashworth
Sent: Tuesday, November 20, 2007 1:22 PM
To: Amps at contesting.com
Subject: [Amps] Winding large inductors


I need to construct a 35uH air inductor using .250 copper tubing. D
is around 5"; L = 10 inches. I can play with the dia & L a bit and
still be in the Q ballpark I desire.

Does anyone have a jig or technique they use to make such a coil
while maintaining the turn spacing and not kinking the tubing? It
needs to be "pretty" because of where it will be located :-)

Thanks
Dennis, K7FL


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