INSTRUCTION
MANUAL
ORDER NO. 386S
Model 18 AVT/WB-S Vertical
Radiator, Amateur Antenna
WARNING
Installation of this product near power lines is
dangerous.
For
your safety, follow the installation
directions.
General
Descri
tion
The Hy-Gain 18AVT/WB-S is an omnidirectional, self-supporting, vertical
radiator that operates in the 10, 15, 20, 40, and 80 meter amateur bands. The
system will work against earth ground or a resonant radial system when
mounted above ground. You make your own radial system following the
manual, or
ou can use the H
-Gain 14RMO radial s
stem kit.
Performance of the antenna can be optimized for either phone or CW with
either a ground or roof mount. Regardless of the optimization, the VSWR
bandwidths of the antenna are broad enough for the antenna to operate at a
VSWR of 2:1 or less from 10 to 40 meters. The bandwidth for 80 meters is
shar
er
because the antenna is to
loaded.
The 18AVT/WB-S now features stainless steel hardware for all electrical and
most mechanical connections.
Heavy-duty "Hy-Q Traps" give automatic band selection. The Hy-Q traps are
parallel resonant circuits which isolate the various sections of the antenna.
This provides true
1
/4-wavelength resonance on all bands. The top hat and
80 meter resonator extend coveraqe to 80 meters by top loadinq.
Electrical
Frequency . ........……....... 80, 40, 20, 15, and 10 meter amateur bands
Input Impedance ..............………………………..............................50 ohms
SWR at Resonance .......……………………............................... less than 2:1
Power Capabilities.............…………………................................ 2 kW PEP'
Lightning Protection ...........…………………............................... DC ground
Input Connector .............. . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . SO-239
Specifications
Theory of
Operation
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