ORDER NO. 383S
Model 5BDQ-S, Doublet Antenna
with Stainless Steel Hardware
INSTRUCTION MANUAL
General Descri
tion
Construction
The Hy-Gain Model 5BDQ-S is a half-
wavelength doublet antenna for 10, 15, 20,
40, and 80 meters. Matched Hy-Gain Hy-Q
traps allow automatic band switching. The
15-20 meter wire is fanned below the 10-40-
80 meter wire to minimize loading. The
maximum overall length is 93' 8".
To further improve the performance of the
5BDQ-S, a Hy-Gain balun Model BN-86 is
recommended. The Model BN-86 is a broad-
band balun designed specifically for doublet
type antennas. It will balance the input im-
pedance to the antenna and prevent
transmission line radiation to increase the ef-
ficienc
of a doublet t
e antenna.
The Hy-Q traps are weather resistant. All
hardware is stainless steel. The center of the
doublet is supported by a yoke-type center
insulator to which the transmission line
attaches. The ends of the doublet are
supported by end insulators constructed of
high impact Cycolac© plastic. The antenna
wire is Alumoweld© #12 which has a
breaking strength of 1200 pounds. It will not
rust or corrode. See "Hints on Handling
Alumoweld© Wire" in the rear of this
manual.
SWR and Feedline
The Model 5BDQ-S antenna is designed for
use with a single 50-ohm coaxial feedline.
The SWR at resonance is 1.5:1 or less on all
bands. Either RG-58/U or RG-8/U can be
used. RG-8/U polyfoam type is reconunended
because of its lower losses and higher power
handling capabilities.
Cycolac® is a registered trademark of Borg Warner
Alumoweld® is aegistered trademark of Copperweld Bimetallic
Grou
Specifications
Mechanical
Overall Length 93’ 8” maximum (48.67m)
Maximum Wind Survival 80 mph (129 kmph)
Antenna Wire Alumoweld® #12
Electrical
Frequency Range 10,15,20,40, and 80 Meters
Input Impedance 50 ohms unbalanced
SWR at Resonance Less than 1.5:1
Maximum Power 1 kW AM, 2 kW PEP
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