It is easy to convert some
commercially made verticals to work on the WARC bands.
(Also see the K7TUC Mod)
For my mod, I used scrap ½ inch plastic
electrical conduit to support the vertical wires (the white PVC pipe or
other non-conductive material also works), 2 lengths at 2 foot long each,
some #14 wire, (see lengths below), a handful of cable tie-raps, something
non-conductive for insulators, (I used scrap plastic tubing), and a 1-1/2
inch hose clamp and some string to tie the insulators to the plastic
supports. See additional pictures below:
Connect both vertical wires and the center conductor of your
coax feed line with a hose clamp (for my portable use I used battery
clamps to attach the coax) at the base of the commercially made vertical
Bottom showing PVC cross arm support with 12 and 17 meter vertical wires attached and connections to radial ring.
"Top Hat" assembly with cross arm showing support attachments for verticals.
The formula for cutting the wire length is the old standby:
234 / Freqmhz = length in feet.
I used 13 feet for 17 meters and 9 feet 5 inches for 12 meters.
If you're a perfectionist you may have to tune and prune your lengths for best performance! I'm like N4UJW and can't speak for KK5ID, I'm a bit lazy so..........
Z-100 tuner and TS-50 transceiver easily tuned both wires! In a few hours
of operating on my first test outing (fair band conditions) I worked
Canada and Mexico plus about a dozen states on each band.
Yukon John, KL7JR
Don't forget to see lots more antenna projects by John on the antenna page!