Valcom Manufacturing Group, Inc.
2
Electrical Properties
V-425
V-425FT
V425-CL
Frequency Range
1.6 to 30 MHz
1.6 to 30 MHz
0.28 to 1.6 MHz
Resonant Frequency
6.1 MHz (nominal)
5.9 MHz (nominal)
0.1 to 2.0 MHz
Power Rating
5kW (average)
5kW (average)
1 kW (average)
Dry Withstanding Voltage
25 kV
Electrical Length
34.5 ft (10.5 m)
36.9 ft (11.3 m)
varies with f
o
1.3
General Description
The V-425 Heavy Duty Whip Antenna is a commercially available version of the AS-
5085/SR Naval whip antenna that has been designed to the strict requirements of the
Canadian Navy.
1.4
Electrical Description
The Valcom V-425 antenna models are field proven 36-foot (11 m) epoxy fibreglass
antennas. They are capable of operating with an average power of up to 5 kW over the
frequency range of 0.28 MHz to 30 MHz. The antenna is available as a side-feed
(standard option), a feed-through-the-base (FT) option and a coil-loaded (CL) option.
1.5
Mechanical Description
Top-Section.
The top-section is a hollow, tapered cylinder made of circumferentially and
longitudinally wound fibreglass filaments using a thermosetting epoxy resin matrix.
Copper strips are embedded in the composite and are secured at the top end to a
hemispherical corona ball and at the bottom to a female threaded ferrule into which the
base section is secured. The surface is sanded to a smooth finish, then it is primed and
painted with a polyurethane surface coating.
Base-Section.
The base-section is constructed and finished in the same fashion as for the
top-section, except that the diameter expands out to meet the integral fibreglass mounting
base. In the standard version, embedded copper conductors are connected to the threaded
male ferrule at the top and to a conducting ring near the bottom. The side feed terminal
extends from the bottom ring to the surface of the antenna approximately 18.0 inches
from the bottom of the base flange. In the CL version, the embedded copper straps
connect to an internal loading coil before terminating to the threaded male ferrule at the
top. Both the standard version and the CL version are available as an FT version, where
the lower feedpoint at 18 inches is internally extended to the bottom of the antenna to a
heavy-duty fibreglass insulator. The base can withstand a flash-over voltage of 25 kV.
V-425 Series Heavy Duty Whip Antenna
VTM-03-016
