The Hy-Gain Hy-Tower (AKA can work 160 with the base loading coil but
it is not my preferred method. If you have room for the "horizontal"
run, Hy-Gain has a kit to add 160 meters in a way I like better as it
requires no tapping of the coil and switching the coil in or out of the
circuit (not convenient.)
The kit consists of a 40 meter trap which is attached to the vertical at
the top of the 24 ft triangular portion and continues on (bare antenna
wire) to the supplied end insulator (provided) forming an inverted "L"
configuration. The 40 Meter trap is to keep the long wire from detuning
the antenna's 40 meter function. This makes 160 band switching
"automatic" like the other bands.
Oh, ...and do tighten all the hardware securely after using
anti-oxidation paste between all clamped metal surfaces. Recently one
of my stubs came unbolted at the top bolt and did a 180 pointing down
instead of up. This after a couple years of service. OOPS!!
Using the supplied stubs as a learning tool, save $ and make your own
stubs for the missing WARC bands on this antenna.
You have chosen wisely... this is a good antenna. Mine is mounted atop
a 37x73x18 (eave height) all metal building with no radials, just the
counterpoise of the building and it works very well. As I am in
Oklahoma where the wind comes sweeping down the plain I put a 3 way guy
on it at the top of the triangular tower part (Phillystran.) This
avoided the requirement to spread the load in the roof structure
substituted for the yard of concrete A N D I can tie antenna ropes to
it to support the ends of 270 ft OCF (Carolina Windom) dipole or
whatever with no worries.
Consider an electrical connection to the rebar cage so you can ground
the tower to it.
Best of luck, enjoy your fine versatile antenna.
Patrick NJ5G
On 12/16/2014 5:51 PM, Allen Brier N5XZ wrote:
I have the hole dug for my new 18HT tower but still a few more questions:
1. The base consists of three 1.75 in by 0.25 in thick aluminum "base
tubes" with long bolts on the bottom which is pushed into the concrete
immediately after the pour. Is there any problem with the aluminum
contacting the concrete producing any kind of adverse chemical reaction?
2. The rods only go into the concrete perhaps 18 to 24 in. Is that
sufficient to hold the tower in the concrete?
3. I have been told that the PVC insulators which are at the top of
the top tower section should be replaced with Teflon due to high voltage at
that point while using the antenna on 160 meters with the base loading coil.
(Note I plan to use a larger physical coil than Hy-Gain recommends). Any
truth to that?
That is all for now.
Allen R. Brier N5XZ
1515 Windloch Lane
Richmond, Texas 77406-2553
(281) 342-1882 (Home)
(713) 705-4801 (Cell)
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