(1)
The Barker & Williamson Broadband Folded Dipole Antenna is designed for continuous frequency operation over its specified
range. The antenna comes fully assembled and pretuned so no measuring or cutting is required. It is all weather rated at 1 KW
PEP SSB/CW ICAS (Intermittent Commercial and Amateur Service), and permits use of the full capabilities of today’s
continuous coverage transceivers. Its single feedline operation for all bands provides excellent performance for military, emergency
management, commercial, and amateur installations. Instant tuning with no moving parts allows continuous ALE operation.
Installation will determine the type of propagation, with skywave/groundwave combination, or just skywave for NVIS use. 1KW
PEP Output power CCS (Continuous Commercial Service) requires the HFT-1 balun and LD-9 matching unit.
These antennas are fully camouflaged. Features include a high impact plastic housing for the balun. The matching unit and wire
spreaders are FRP fiberglass. Feedline impedance is 50 ohms, and the antenna is equipped with a female N connector. The wire
is PVC insulated copper with a highly flexible rope lay. For the best mid/long range omni-directional radiation, installation
as a shallow inverted Vee is suggested. For NVIS install as a flat-top low to the ground. These antennas require a three pole
installation, using our MK114-CM center mounting kit, which is included. Also included is a camouflage antenna carry bag with
weather resistant take up spools. We seperately offer fiberglass mast kits for rapid deployment.
WARNING:
Do not install where antenna conductors could come in contact with your utility wires. Do not install
over or under utility wires, as wire breakage could cause contact to occur. People and pets must not come in contact
with antenna conductors during transmit operation. Refer to FCC rules on determining a safe zone around the antenna.
Balun and balancing network may become hot during high power operation.
Planning: Determining How and Where to Install
Remember that any radio station is only as good as its antenna. Take the proper time and care to plan it out. A successful installation
requires attention to antenna height, surrounding objects, feedline choice, location and orientation.
(1) NVIS propagation is performed as a flat-top with height varying from ground level to approximately 12 feet. This height is dependent
on the ground (soil) conditions. It may be possible to lay the antenna on the ground in desert/low water table environments. The B&W
NVIS mast kits allow multiple heights. In NVIS installations a counterpoise will sometimes enhance performance. If you are not getting
enough distance from your NVIS setup, try raising the center of the antenna a few feet to make a very shallow inverted Vee. (Appropriate
NVIS daytime frequencies are approx 5-12 Mhz, nighttime are 2-4 Mhz.)
(2) Conventional propagation minimum clear height is recommended at 25 feet for operation down to approx 3.5 Mhz (ends 12 feet for
inverted Vee or sloper), and 40 feet for 1.8 Mhz (ends 20 feet for inverted Vee or sloper). Less height does not disqualify operation, but
may require a tuner on the lowest frequencies. Also, propagation may be reduced with inadequate height on the lower frequencies.
(3) This is a non-grounded antenna, so surrounding "grounded objects" try to absorb your radiated wave on low frequencies. This may
result in poor SWR, and/or poor signal reports. "Grounded objects" include metal towers/poles, roofs, gutters, trees, and the ground itself.
When supporting from metal towers/poles, step off (or up) from the metal with a wood or PVC support arm 3 to 5 feet. Avoid crossing over
roofs when possible. When using trees for supports, try to stay clear of the branches.
(4) When installing in an attic or close to a roof, remember that gutters, power line, and conduit/pipe runs become antennas that may
cause coupling problems at certain frequencies. Attempt to stay perpendicular to such objects. Always keep the balun and balancing
network hanging in the air with proper support such as an FDMK, away from wood and insulation to avoid fire hazard.
(5) Use the proper feedline. Examples are RG-8 (thick), RG-213, 9913. Over 50% of installation problems are coax/connector problems.
Check your feedline (including new ones) with a dummy load placed at the antenna end of the coax. Transmit into the dummy load and
check for 1:1 SWR on all bands. Do not substitute an analyzer for this step. Thin coax such as RG-8X may be used up to 20 watts.
8/12
BARKER & WILLIAMSON
6025 TECHNOLOGY DR
W MELBOURNE, FL 32904
321-676-8354
www.bwantennas.com
BROADBAND FREQ AGILE HF FOLDED DIPOLE ANTENNA
CAMOUFLAGED FOR TACTICAL USE
U.S. PATENT #4423423
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