[TowerTalk] HY-GAIN 18HT HIGH TOWER & CTSVR

[Jim Reid]

At 08:47 AM 1/10/98 CST, k0gex@juno.com wrote:

>Does anyone have experience with the HY-GAIN 18HT High Tower 

Also, does anyone have comparison with the Uni-Hat CTSVR
antenna,  built by N5NUG?  It is  31 feet tall,  has a 15 foot diameter
top hat--eight  Alum. "spokes" with a wire circumference run around the
spoke ends--;  four sleeve or skirt wires drop down to the bottom.
CTSVR = Capacitance Terminated Short Vertical Radiator.

General  idea  seems,  per K5YNR article in ARRL Antenna Compendium, 2nd ed.,
pg. 36,  to be to form  a 1/16th wave folded dipole on 160;  1/8th on
80,  and  1/4th on 40, with input impedance of 50 0hms,  each band;
 Since it is a "folded dipole" the radiation
resistance is higher that would be the case with just a plain
vanilla short vertical radiator. Claim is 50 ohm  radiating resistance
on 160 meters.  I wonder if it isn't just the feedpoint impedance
which is 50 ohms R on 160,  but do not know.

Uni-Hat's literature shows data about the field strength which
displays that the radiation is greatest just below the top hat.
Or,  that is where the current is highest,  rather than at the
bottom,  which would be the case with the Hy-tower.

Any experience about this from the group??  Thinking seriously
about adding a low band vertical to the "farm".  Have also
gotten info from Titanex in Germany about their V160E,
which was used so successful out on Kure Island on 160
last Fall -- 599+ on the West Coast, some 3600 miles
East of Kure,  and 599 on the East Coast 5500 miles East!!
But the V160E is costly,  and very difficult to get to Kauai,
must go through US Customs in Honolulu,  then be re-shipped
on over to Kauai,  bummer!!

So, what to do,  which to go for??

73,  Jim, KH7M
On the Garden Island of Kauai


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