Topband: Ideas for xmit antennas for new QTH in KH6
Herbert Schoenbohm
herbs at vitelcom.net
Wed Dec 9 17:39:32 EST 2015
Is there anyway you can put a slip ring to support a T antenna (Marconi)
for 160 and 80 at some height that won't snag the beam elements?
Herb, KV4FZ
On 12/9/2015 6:34 PM, Cqtestk4xs--- via Topband wrote:
> Next year I'll be building a new home and station in Hawaii.
>
> 40 through 6 meters is already set in stone, but 80 and 160 are still
> cloudy.
>
> Here's the setup:
>
> I'm allowed one tower maximum 90 ft. The tower will be 90 ft of Rohn 55
> using a K0XG rotating system with two rings. It will be guyed using
> fiberglass guys. There will be a bunch of HF VHF stuff on the tower. Three
> tribanders, two 12/17 meter Yagis, a 40 meter Yagi and way down on the bottom
> two 6 meter antennas.
>
> The tower sits on VERY uneven ground. Although the lot measures 12
> acres, I am using only the top three and renting out the rest of the land to a
> farmer to keep taxes from being crazy high.
>
> The ground is pure alluvial red fine particle soil (no stones) and has a
> depth of about 6 feet before hitting rock. Since the east side of Hawaii
> gets at least 100 inches of rain a year it is usually pretty moist. I would
> assume the soil is at least average or better in conductivity. I can run
> ropes, wires etc off the tower at the 80 and 40 foot guy points, but can not
> connect directly to the tower since the tower rotates. The is no room for
> a rotating dipole on the tower for 80.
>
> I've used quad triangle loops before with the pointed end on the bottom
> suspended by wires and am leaning towards that since the ground is so uneven
> and the terrain difference would be a real negative for a 4 square (I
> think).
>
> On 160 I'm leaning toward a wire vertical suspended from a rope coming
> from the tower which would make the antenna about 65 or 70 feet tall and to
> compensate for that I would make it a T-top.
>
> For rx I have lots of room to run a 700 -900 Beverage to JA and another to
> EU/USA direction, so that isn't a problem.
>
> I do need suggestions for my 80 and 160 tx situation. Any ideas?
> _________________
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