barker--williamson all bwd and bwds broadband folded dipoles Benutzerhandbuch
(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 2KW PEP Input, 1 KW PEP
Output 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.
antenna comes fully assembled and pretuned so no measuring or cutting is required. It is all weather rated at 2KW PEP Input, 1 KW PEP
Output 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.
Features include a high impact plastic housing for the balun and matching network. Feedline impedance is 50 ohms and comes equipped
with an SO-239 (female) coax cable connector. Other connector options such as N are available from the factory. The antenna may be installed
as a flat-top, inverted Vee or a sloper. For the best omni-directional radiation, installation as a shallow inverted Vee is suggested. Our
FDMK mounting kit is available for inverted Vee, or other three pole installations. NVIS is performed as a flat-top. We offer complete rapid
deployment kits for NVIS, with fiberglass poles and carrying bags. Please note that the 180 foot antenna requires a three pole installation.
with an SO-239 (female) coax cable connector. Other connector options such as N are available from the factory. The antenna may be installed
as a flat-top, inverted Vee or a sloper. For the best omni-directional radiation, installation as a shallow inverted Vee is suggested. Our
FDMK mounting kit is available for inverted Vee, or other three pole installations. NVIS is performed as a flat-top. We offer complete rapid
deployment kits for NVIS, with fiberglass poles and carrying bags. Please note that the 180 foot antenna requires a three pole installation.
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.
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.
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 pole 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.)
The B&W NVIS pole 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 operation 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.
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.
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 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.
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.
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.
(6) The location will usually be determined by trade-offs of height, available supports, and interfering objects. Sometimes, multiple
trials may be necessary to judge which installation is best. Unfortunately, HF is difficult to predict. Usually, adequate height is favored
over other parameters.
over other parameters.
2/05
BARKER & WILLIAMSON
603 CIDCO ROAD
COCOA, FL 32926
321-639-1510
www.bwantennas.com
BROADBAND FREQ AGILE FOLDED DIPOLE ANTENNA
U.S. PATENT #4423423 (EXP)
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