308 Industrial Park Road
Starkville, MS 39759 USA,
Ph: (662) 323-9538 FAX: (662) 323-651
Model V-4R
Collinear Gain Vertical
for 420-450 MHz
INSTRUCTION MANUAL
General
The new Hy-Gain V-4R 70cm antenna is a
collinear, dual 5/8-wave, omnidirectional, vertical
antenna for the 420-450 MHz amateur band. The
V-4R features two sets of 1/4-wave radials which
properly decouple the lower 5/8-wave radiator
from the mast. It also features a 500 watt
enclosed coil that matches the antenna to a
nominal 50 ohms. The ruggedized V-4R is
suitable for personal use, repeater, and packet
BBS service.
The feedpoint is a high quality "N" type
connector that is protected from the weather
within the lower radiator. The V-4R also features
a mast-to-mast bracket that will accept up to a
two inch O.D. mast.
The V -4R can be used outside of the 70cm
amateur band. Graphs are supplied so that the
antenna can be set to any frequency between 400
and 470 MHz.
SPECIFICATIONS
VSWR at Resonance ........................................................................
less than 1.5:1
2:1 VSWR Band Width................................................................................27 MHz minimum
Power Gain..........................................................................................................3 dBd (5.2 dBi)
Antenna/Mast Isolation..................................................................................................... 20 dB
Power Input ..............................................................................................500 watts continuous
Lightning Protection ....................................................................:........................... DC ground
Height (nominal)............................................................................................46 inches (1.17 m)
Wind Area ............................................................................................... 0.31 sq. ft. (0.03 sq.m)
Maximum Mast O.D. ....................................................................................2 inches (5.08 cm)
Hardware .......................................................................18-8 stainless steel except for U-bolts
Maximum Wind Survival (no ice) ...................................................... 230 mph (370.15 kmph)
Assembly
Unpack the antenna and check the parts against
the Parts List and drawings.
Select four of the radial clamps and associated
hardware and loosely assemble them as shown in
Figure 1.
Repeat the previous step for the remaining four
radial clamps.
Set both assembled clamps upside down on a flat
surface.
Select the eight (8) 7/16" x 6" radial tubes (Item
No. 4), and insert them completely into the
assembled radial clamps.
Tighten the outer eight (8) bolts of each assembly
just enough to hold the radial tubes in place.
These bolts will be securely tightened in a later
step.
