[TowerTalk] shunt feeding @ N4ZR
kd4e
kd4e at verizon.net
Wed Nov 16 08:59:39 EST 2005
I have a really big coil on an 18" x 4" phenolic
tube with several .01 2500 WVDC caps that I believe
had been used for some sort of tower shunt feed.
It is marked part number 994-3936-001
The wire is coated with something white and appears
to be enameled and may be #12 or so. The wire turns
appear to be several layers.
Ever seen such a beast?
> Did you ever try an L network?
> First iteration of my shunt feed was C at the base in series. Tuned
> for minimum SWR and then cut top loading to get SWR down further.
> Then, I had an "ah-ha" moment. Why not use a step-up L network:
> series C and parallel L at the antenna side?
> I was able to tune out both reactances this way w/o having to cut top loading.
> Makes a lot of sense to me.
> 73, Craig Clark, K1QX
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Thanks! & 73, doc kd4e
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