I'm feeding a half sloper for 160 on the 100 ft tower.
I've fed it direct which worked just fine with no apparent RF on the
feedline. However I'm adding a current choke just to be sure and
changing from a single wire to either a fan or cage for the antenna to
broaden it out a bit.
I have room in the box to run 6 cores in solenoid or binocular fashion.
I've been planning on 6 or 7 turns of Davis BuryFlex in solenoid
fashion. Yes, with a little "wire soap" I really can get 7 turns
through there, BUT this makes for a pretty good sized choke when it gets
to be at least 8 or 9 inches across.
So, I've also looked at using RG-400 in the same configuration although
I could easily add a few turns, but on 6 31 mix, 2.4" cores 6 or 7 turns
should be plenty sufficient for 160.
OTOH if I place two short stacks of 3 cores each side by side and just
tack them together with a little epoxy (for stability) I can coil the
coax into a 6 or 7 turn (coil) that will be relatively compact even when
using Davis BuryFlex although it's still easier using RG-400.
With the RG-400 and 2 stacks I could wind a very compact choke which I'm
planning on doing for the C19-XR and WARC7.
My question is about the difference between the 6 cores stacked or two
stacks side by side. Would there be much difference between them as far
as the resistive component of the common mode choke. These being
toroids I would think the magnetic fields are pretty much contained
inside each core and the associated winding(s) and doubt there would be
much difference between configurations.
Thoughts?
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