Hy-Gain V-4S instruction manual
IkEfEX N
TELEX COMMUNICATIONS, INC.
3600 ALDRICH LIVE SO. MINNEAPOLIS. MN 55420 U S A
/~g-~~~~r”iu IORDER NO. 337s
MODEL V4S
MAN’ ‘A’
Collinear Gain Vertical
I
for 420450 MHz
PN801910
General Description
Specifications
Assembly
The new Hy-Gain V-4s 70 cm antenna is a collinear, dual % wave, omnidirectional,
vertical antenna for the 420-450 MHz Amateur band. The V-4s features two sets of %
wave radials which properly decouple the lower % wave radiator from the mast. It also
features a 100 watt enclosed coil that matches the antenna to a normal 50 ohms. The
feedpoint is a high quality “fY type connectorthat is protected from the weather within the
lower radiator. The V-4s also features a mast-to-mast bracket that will accept up to a two
inch O.D. mast.
The V-4s can also be used outside of the 7.0 cm Amateur band. Graphs are supplied so _
that the antenna can be set to any frequency between 420 and 470 MHz.
VSWR at resonance
2:l VSWR bandwidth
Power gain
Antenna/ Mast isolation.
Power input
Lightning protection
Height.
Wind area
Maximum mast O.D.
Hardware
Unpack the antenna and check the parts against the Parts List and drawings.
..................................................... 3 dBd, 5.2 dEii
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................................................. 20 dl3
100 watts continuous
................................................. DC ground
......................................... 2 inches (5.08 cm)
18-8 stainless steel except for U-bolts
less than 1.51
27 MHz minimum
.45 inches (1 .I 4 m)
0.28 sq. ft. (0.026)
Select four of the radial clamps and associated hardware and loosely assemble them as
shown in figure 1.
< -\-A
- - ;*$A
Figure 1
-l-
PO-3315-A-001
t
I
I-l” x 28’
; SLOTTED TUBE
I
Item
No. Oexcrlption
2 Redlel cbmp, 4S0
6
Tube 1” x 26”. slotted
13 Bolt,‘#lO-24 x t/2” hex
Lo&washer, X10, Intemel
15
16 Nut, 010-24, hex
,
Repeat the previous two steps for the remaining four radial clamps.
Set both assembled clamps upside down on a flat surface.
Select the eight radial tubes (7/l 6” x 6”) and insert them completely into the assembled
radial clamps.
Tighten the outer eight screws of each assembly just enough to hold the radial tubes in
place. These screws will be securely tightened in a later step.
Select the 1“ x 28” tube.
Slip both radial assemblies over the bottom of the 28” tube and position as shown in Figure
3 and Detail A. The unslotted end of the 28” tube is the bottom. Determine the “B”
dimension form figure 6. For example, at 445 MHz, B=8 3/16” (208 mm).
Tighten all screws in both radial assemblies securely and evenly.
Select the mast-to-mast clamp, plate and associated hardware and loosely assemble
them as shown in Figure 2.
AO-3375-B-002
.
Item
No.
1 Mart-to-mart
3 Maat-to-maat
6
Tube 1” x 28”. slotted
18
Bait, ;/V-20 x 3/W hex head
20 Lockwasher. l/4”, internal
21 Nut l/4”-20 hex
23
u&a, s/16:’ x 2” x 2 11116”
24
Lo&washer. S/lb”, split
25
Nut. Y16”-10, hex
Detcriptton
bracket plate, 1 l/E”
bracket clamp, 1 118”
Slide the assembled clamp over the bottom end of the 28” tube as shown in Figure 3 and
securely tighten the four %I’-20 x %” screws.
Select the V-4s Coax adaptor assembly. The coaxial cable will attach to this in a later step.
Select the matching coil.
I
Figure 2
MAST (not supplied 1
I-
\
Screw the adaptor assembly into the base of the matching coil until snug. The pin in the
adaptor assembly should make contact with the pin in the base of the matching coil.
Select the V-4s whip adaptor. This part has %I’-24 thread on one end.
Screw the whip adaptor into the top of the matching coil.
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