Hy-Gain VB-215DX Instruction Manual

INSTRUCTION MANUAL
GENERAL DESCRIPTION
The Hy-Gain Model 215DX is a high
performance yagi antenna for SSB/CW DXing in
the Amateur 2 meter band.
It features 15 elements on a 28 foot (4.03
wavelength) boom, with superior gain, low
sidelobes, and high front-to-back ratio. It also
features an encapsulated feedpoint and a
weatherproof, low loss type N connector for use
in all types of climates. The useable frequency
range of 144-146 MHz makes the 215DX suitable
for 144 MHz EME and terrestrial DX, and 144-
146 MHz satellite communications. The 215DX
antennas may be easily stacked for increased
performance
ELECTRICAL DESIGN
The 215DX design is based upon the DL6WU
log-tapered design information. Performance was
verified by testing on Hy-Gain's antenna range
and by computer modeling with the NEC-2 and
Yagi Optimizer(C) computer codes. The
antenna's performance characteristics were
optimized for the 144-144.5 MHz frequency
range. This electrical design also permits the
addition of more director elements for additional
gain, with little or no retuning.
Yagi optimizer(C) copyright by Brian Beezicy
Model VB-215DX
2 Meter 15 Element Yagi for SSB/CW
MECHANICAL DESIGN
The 215DX mechanical design features a 6-
section boom which can be easily disassembled
and reassembled for portable operations. A sturdy
tubular boom support is included to reduce boom
droop and to add structural strength for severe
icing conditions.
Most hardware is stainless-steel including the
element retaining rings (push nuts). All insulators
are UV protected. The coaxial balun assembly is
made from high quality RG-303/u and RG-142
B/u PTFE dielectric and FEP jacketed coaxial
cable
The 215DX is constructed so that the addition of
2 or 3 more directors will not adversely affect the
balance or structural integrity of the antenna.
Figure 1
VSWR Chart