No insult intended, Bill, I just want to mention something important and
if you don't know it could bite you. Of the two baluns, the upper one
between your approximate 90 ft wire and your approximate 180 ft wire,
has to be one that does not eliminate common mode currents flowing on
the outside surface of the 22 ft coax. OOPS, your 21 ft coax (mine is
22ft.)
That common mode current provides the radiation needed from that
vertical 21 feet of coax. I cant quote mfg and part number but you do
want to use the correct type balun. Baluns that prohibit/attenuate
common mode current on the outer surface of the coax are terrific for
their intended purpose and I use them but NOT between the unequal legs
of a Carolina Windom. The vertical 21 feet of coax is a part of the
antenna N O T part of the feedline. The feed point is at the lower of
the two baluns.
Usually my OCF dipole does about as good as my Hy-Gain Hy-Tower for 10%
of the cost or less except on 10M where my tuner can't make a go of it.
Good luck, Bill, hope to hear you on that OCF dipole.
Patrick NJ5G
On 1/23/2015 11:33 PM, Bill Bennett wrote:
I have noticed that the CW160 and CW80 have the same 21 foot vertical
radiator between baling and choke. Why 21 feet?
Reason I ask is I am trying to roll my own CW160. I noticed that Radio
Works uses RG58 with foam dielectric and I would like to use RG8. Do I need
to account for velocity factor difference?
Thanks
Bill Bennett K4IBC
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