General Description; Theory Of Operation - WADE Antenna, Inc. Taco Antenna D4000 Series Instruction Booklet

General Description

The TACO Model D4000 and D5000 series antennas are vertically polarized
omnidirectional antennas, specifically designed to provide optimum
performance throughout the DOT/FAA frequency band ranging 118-136
MHz and 225-400 MHz. The internal elements or dipoles are enclosed in a
fiberglass radome, ultimately resulting in a lightweight, low profile, rugged
communications antenna.
The D4000 or 5000 series antenna mounts to the top of the mast, thus
sheltering the transmission line from any environmental exposure. Some
D4000 series models are also available with an adapter capable of
mounting to a 1.66" O.D. mast.

Theory of Operation

The process employed in a D4000 or D5000 series antenna incorporates
the patented Muldipol
in a unit having excellent "broadband" halfwave dipole characteristics over
its entire specified frequency bandwidth. The desired "figure eight"
radiation pattern is generally constant throughout the band. Through
"broadband" suppression of extraneous currents upon the transmission
line, the undesirable "Clover Leaf" pattern is avoided.
A grounding lug is provided at the base of each antenna for supplemental
Azimuth Pattern
grounding capability.
Antenna Model:
Freguency Range:
Maximum Gain:
-3dB Beam width:
Tested Polarization:
MODEL D5076
Instruction Booklet - D4000 and D5000 Series Omnidirectional
concept. The utilization of this technique results
TM
D5076
118 - 136 MHz
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VERTICAL
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29 Sharp Rd, Box 1206
Brantford, Ont., Can., N3T 5L8
www.wadeantenna.com
5-Oct-09
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