[Elecraft] Loading inductor Question

[Fred Townsend]

Ken:
Toroidal cores have many fine qualities for loading coils. Of course not all
core have the same qualities so be sure you have the right Al rating. You
will want a low rating. Also remember you will lose those fine qualities if
you saturate them so be sure your core is big enough for 250 watts (2.5x
safety margin). I use Teflon wire on mine for lower losses. Finally, it is
very difficult to tap a toroid whereas coil taps are easy on an air core
coil. Don't use toroids if you need taps. 
73
Fred, AE6QL

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ken Alexander
Sent: Monday, April 30, 2012 8:15 AM
To: Elecraft
Subject: [Elecraft] Loading inductor Question

Folks,

Given that inductors on toroid cores are used extensively in autotuners, is
there any reason (assuming I choose the right size core, made of the correct
material for the application and winding it with the right size wire) for
not using one as a base loading inductor on a vertical antenna?  I'm talking
100 watts maximum transmitter output here.

Any down side to doing this?

Thanks and 73,

Ken Alexander
VE3HLS
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