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A Visit to WX0B
|WX0B is located East of Dallas on the western shore of
Hubbard. The property site is above the lake by 40 feet has a steep
drop down to the lake. The lake being where it is enables the two
towers to have a water path to the North through East and ending
South East. It also makes the towers appear as if they are 40 feet
taller to RF. So my 150 ft tower is effectively at 190 ft! The QSL
photo, above, was taken before the recent upgrade of most of the
antennas. The 4 element 10's & 15's in the foreground are now 5
elements and a third tower exists towards the lake.
Tower 1 RTS (Rotating Tower Systems) by Custom Metal Works Paul Nyland
WX0B rotating tower for 80, 40, 20 & 6M. This tower was recently
taken down (2012) and rebuilt so that the whole tower rotates from the
bottom As there are certain SO2R related disadvantages to having all
these antennas pointing in the same direction, versatility is added
by having two of the beams mounted on the new
Prosistel ring rotors
so they can be strategically pointed in a different direction. The
top 40 and middle 20 can thus turn independently. This is good in DX
contests when the two bands are open in different directions. In
stateside contests, both 20 and 40 can have separate beams on each
coast. The rotating tower rings are manufactured by Custom Metal
Works. It is very well built, reliable, and safe.
Above pictures show the large Hoffman enclosure that houses all the
coaxial and control line lightning arrestors, StackMatches for 20 and 40
(40 has BIP/BOP) , 80/75m tuner system, and two 2kW harmonic filters for
80 and 20.
100 foot 10/15m tower.
|3 x 5 element 10M, 25 ft boom Homebrew QuackBeamsTM @ 111/95/60 ft, or|
141/135/100 over the lake. This is a high stack (no low beam due to
obstructing oak tree). All three beams have rotors.
|2 x 5 element 15M, 36 ft boom Homebrew QuackBeamsTM @ 101/50 ft, or|
141/90 over the lake. The low beam is fixed NE, and is the ONLY beam
at the station that doesn't rotate.
Looking up at the 10/15 tower.
Tower Three (below) is a Force 12 - 42 foot Crank up with an
Optibeam OB7-3 on
it with a Prosistel 2051D rotator.
This is used as a multiplier antenna, and as a spare to point in a
different direction than the main stacks, such as to VK/Pacific, or Caribean/South
160 METER feedpoint showing heliax feed line and shunt coil
|Here is the160m feed point. Notice the big green coil.
It is the matching "helical hairpin" that transforms the feedpoint from 36 ohms
to 50 ohms for a direct coaxial feed. It also doubles as the static
bleed choke to drain off static charges. There is an
on the other end of the coax in the shack. There are 32 radials
under ground and bolted and soldered to the radial ring and a 1/4"
copper ring. We have great ground here so I was able to get 36 ohms feed
impedance with just the 32 radials. We may add more later.
vertical is approx 50 feet tall, and has a wire that resonates it sloping
up to the tower behind. The angle is approx 45 degrees to the tower. There
is an insulator in the wire at the resonant point. The other black Dacron
rope you see coming down from the vertical is a back stay to keep things
vertical. The whole thing doubles as a flag pole for us.
Inside the shack - Roy AD5Q at the key during CQ WW CW 2008
Two PowerMaster wattmeters are above the SixPak indicator in the rack panels.
The blue box behind the white sheet of paper is the 80m phased array controller.
STackMatch controllers above left 781. Beverage selection and Preamp controllers are in between the 781s.
Rotator controllers are the stacks on the left. BandMasters are the two small boxes behind the monitor.