Valcom V-425 Series Manuel utilisateur

VTM-03-016

TECHNICAL MANUAL

and

INSTALLATION INSTRUCTIONS

V-425 SERIES

36-FOOT HEAVY DUTY

WHIP ANTENNA

Valcom Manufacturing Group, Inc.

175 Southgate Drive, P.O. Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: 519-824-3220 Fax: 519-824-3411

Web Site: www.valcommfg.ca E-mail: enquiries@valcom-guelph.com

Valcom Manufacturing Group, Inc. ii

REVISION SHEET

Revision Description Date

- Original Issue September 18, 2014

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. iii

TABLE OF CONTENTS

1.0 V-425 INFORMATION

1.1 Introduction..........................................................1

1.2 TechnicalReferenceData. ..............................................1

1.3 GeneralDescription....................................................2

1.4 ElectricalDescription...................................................2

1.5 MechanicalDescription.................................................2

1.6 ScheduledMaintenance.................................................3

1.7 CorrectiveMaintenance.................................................3

2.0 INSTALLATION

2.1 Unpacking...........................................................4

2.2 NewSitePreparation...................................................4

2.3 Assembly and Installation of Antenna on the site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Electrical. ...........................................................5

3.0 PARTS LIST

3.1General.................................................................6

4.0 QUICK REFERENCE DATA

4.1Manufacturer’sAddress....................................................7

4.2OutlineDrawing..........................................................8

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. 1

1.0 V-425 INFORMATION

1.1 Introduction

This section describes the electrical and mechanical properties of the V-425 series of

fibreglass whip antennas. Information necessary to install, operate and maintain the

antenna system is covered in the sections to follow.

1.2 Technical Reference Data

Mechanical Properties

V-425 V-425FT V-425CL

Top Section Length 18.5 ft (5.67 m)

Base Section Length 17.5 ft (5.33 m)

Typical Assembly Length 36.0 ft (11.0 m) 36.9 ft (11.3 m) 36.0 ft (11.0 m)

Weight 155 lbs (70.3 kg) 160 lbs (72.5 kg) 155-175 lbs (70-80 kg)

Conductor Material Copper wire and strips embedded in the fiberglass and thermo-setting

epoxy resin composite

Finish Polyurethane paint

Mounting Position Vertical

Base Diameter 17.5 inches (43.75 cm)

Mounting Hole Diameter 0.718 inches (1.79 cm)

Joints Bronze ferrule C/W locking screw

Mounting Holes

Dimensions

12 holes equally spaced on a 14.625 inch (36.56 cm) diameter bolt

circle

Storage Temperature -140F to +158F (-95C to +70C)

Operating Temperature -76F to +140F (-50C to +65C)

Wind Loading Test Up to 150 mph (240 km/hr) relative

Abrasion Resistance Very good

Water absorption

After 24 hours immersed: 0.2%

After 48 hours immersed: 0.6%

After 168 hours immersed: 2.0%

V-425 Series Heavy Duty Whip Antenna VTM-03-016

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 fo

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

Valcom Manufacturing Group, Inc. 3

1.6 Scheduled Maintenance

The antenna is virtually maintenance free. The external finish is a polyurethane two part

compound paint. The minimum finish life before showing signs of deterioration should

be at least ten years under normal climate condition.

When used in salt-water environments, it is recommended to wash the antenna base with

fresh water to remove any build-up of dried salt residue. This should be performed on a

monthly basis or after prolonged exposure to sea-spray.

Use a small wire brush to clear any debris from the drain groove found in the bottom of

the antenna base. In the case of the FT version, there is a small drain hole located on the

side of the insulator. This hole should be kept clear from blockage using a small length

of stiff wire.

All threaded hardware, including the base mounting bolts, the set-screws at the joint and

the input power connection should be inspected for signs of damage and to ensure proper

tightness (suggested torque settings can be found on pages 8 and 9). In most cases a quick

visual inspection is all that is required. This must be performed on a monthly basis or

whenever practical.

1.7 Corrective Maintenance

Generally, no corrective maintenance is possible or required. If one section is severely

damaged, it must be replaced by a new section. Workshops having experience in

handling epoxy fibreglass composite structures may attempt the repair of minor surface

damage if practicable.

NOTE

DO NOT USE LEAD BASE PAINT TO TOUCH-UP OR REPAINT

THE ANTENNA. USE ONLY EPOXY BASE PAINT.

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. 4

2.0 INSTALLATION

2.1 Unpacking

Open the shipping crates and remove the antenna sections and any possible accessories

purchased with it. Remove all packing material including the male ferrule protector on

the antenna section. The V-425 antenna, as shipped, consists of the items listed in Table

3.1. Check that all of the items are present and in good condition.

2.2 New Site Preparation

The following are the basic steps to erect a complete V-425 antenna system on land.

Other configurations should be handled accordingly.

(1) Check to see that the site is free of cables, debris and other obstructions.

(2) Excavate and pour concrete pad in the site chosen.

(3) Excavate trench in site chosen as required.

(4) Install Ground Screen in site chosen.

(5) Lay cables and backfill all trenches.

(6) Erect antenna.

2.3 Assembly and Installation of Antenna on the site

(1) Obtain four saw horses or other supports that will hold the complete antenna

horizontally at a convenient working height and place them in the assembly area. The

assembly area must be a cleared working space approximately 40 feet long and 20

feet wide.

(2) Support the base section (Item 1, Table 3.1) on two of the saw horses.

(3) Support the top section (Item 2, Table 3.1) on the other two saw horses so that the two

sections lie in the same straight line.

(4) Make sure the threads of the male and female ferrule on the base and top sections are

clear of foreign material and not damaged.

(5) Assemble the second antenna section onto the base section and tighten to align the

arrows (if applied) at the joint using the strap wrench supplied (Item 3, Table 3.1).

Install the set-screws and seal with the sealant provided (items 4 and 6). A final

torque between 65-85 in-lbs is acceptable for the set-screws.

(6) The antenna is now ready to be raised to its final position. Raise antenna into position

using a gin pole and winch or a bucket truck or a crane.

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. 5

(7) Once the antenna is in the vertical position, secure the antenna to its mounting plate

with eight 5/8-11 hex head cap screws (not provided), along with two flat-washers, a

split-lock-washer and a nut. Bolt length will need to be determined by the installing

activity. A final torque between 90-100 ft-lbs is acceptable for the bolts.

2.4 Electrical Installation

Connect a suitable feed wire from the antenna coupler to the antenna feedpoint (found

either on the side of the antenna or the bottom of the antenna.

Connect a suitable lead wire from the ground lug of the antenna coupler to the antenna

ground screen.

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. 6

3.0 PARTS LIST

3.1 General

A list of parts shipped with Valcom V-425 whip antenna appears in Table 3.1.

Table 3.1 - List of Parts for the V-425 whip antenna

Item No. Part Number Description Qty Notes

1 Base Section 1

2 Top Section 1

3 Strap Wrench 1

4 Set Screw Kit 1

5 Hex Key 1

6 Silicone Sealant 1

7 Technical Manual and Installation

Instructions

V-425 Series Heavy Duty Whip Antenna VTM-03-016

Valcom Manufacturing Group, Inc. 7

4.0 QUICK REFERENCE DATA

4.1 Manufacturer's Address

Postal address: Shipping address:

Valcom Manufacturing Group, Inc.

P.O. Box 603

Guelph, Ontario

Canada

N1H 6L3

Valcom Manufacturing Group, Inc.

175 Southgate Drive

Hanlon Industrial Park

Guelph, Ontario

Canada

N1G 3M5

V-425 Series Heavy Duty Whip Antenna VTM-03-016

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