OK....fine! From there attach a Dacron rope to support a Lazy Inverted
L or sloper that is started some distance away from the tower to
minimize interaction, and feed it with 50 ohm coax against a few
radial. You can even drop a wire for 80 meters from the same halyard
and use the same feed connection. Both the 160 and 80 wires should be
slightly longer than 1/4 wave so two different series capacitors can be
used as may be required. If the 160 and 80 drop wires are 20 feet or
more apart you should be able to use the same feed line without any
serious problem. The radial you use for 160 work just a good for 80 and
of they are insulated wire laying on the ground need not be a quarter
wave and can be 20 to 30% shorter than normal.
Herb Schoenbohm, KV4FZ
On 12/9/2015 9:12 PM, [email protected] wrote:
*Yes, at 80 ft.*
In a message dated 12/9/2015 10:43:27 P.M. Coordinated Universal Tim,
[email protected] writes:
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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