Valcom AS-1735/SRC User manual

Valcom Manufacturing Group, Inc
175 Southgate Drive, P.O. Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: [phone] Fax: [phone]
Web Site: www.valcommfg.ca E-mail: [email protected]
TECHNICAL MANUAL
VTM-01-003 Rev C
OPERATION AND INSTALLATION
INSTRUCTIONS
AS-1735/SRC ANTENNA

AS-1735/SRC VTM-01-003C
Valcom Mfg Grp, Inc.
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REVISION SHEET
Revision Description Date
A Original Issue July 20, 2001
B Various formatting changes to improve readability May 28, 2002
C Updated contact information October 7, 2013
Errors in this publication can be reported to the Manufacturer.
Refer to Section 6 for contact information.

AS-1735/SRC VTM-01-003C
Valcom Mfg Grp, Inc.
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TABLE OF CONTENTS
Section Page
1.0 GENERAL INFORMATION .............................................. 1
1.1 Scope .......................................................... 1
1.2 Description ..................................................... 1
2.0 INSTALLATION ........................................................ 3
2.1 Unpacking ...................................................... 3
2.2 Handling ....................................................... 4
2.3 PowerRequirements .............................................. 4
2.4 Cabling ........................................................ 4
2.5 Site Preparations ................................................. 4
2.6 InstallationRequirements ...........................................4
2.7 Alternate Installation Method ....................................... 8
3.0 OPERATION .......................................................... 10
3.1 FunctionalDescription ........................................... 10
3.2 OperatingProcedures ............................................ 10
4.0 TROUBLE SHOOTING AND MAINTENANCE ............................. 11
4.1 General ........................................................11
4.2 EquipmentRequired ............................................. 11
4.3 Typical Troubles ................................................ 11
4.4 PreventativeMaintenance ......................................... 11
5.0 PARTS LIST .......................................................... 12
5.1 General ....................................................... 12
6.0 QUICK REFERENCE DATA ............................................ 13
6.1 General ....................................................... 13
6.2 Manufacturer'sAddress .......................................... 13

AS-1735/SRC VTM-01-003C
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LIST OF TABLES AND FIGURES
TABLES
Table 1.1 - Electrical Properties of the AS-1735/SRC Antenna ......................... 1
Table 1.2 - Mechanical Properties of the AS-1735/SRC Antenna ....................... 2
Table 5.1 - Parts supplied with AS-1735/SRC antenna Shipment ...................... 12
Table 5.2 - Optional Parts available for the AS-1735/SRC antenna .................... 12
FIGURES
Figure 2.1 - Identifying the main sections of the AS-1735/SRC ........................ 3
Figure 2.2 - Mounting the AS-1735/SRC around masts of 4 inches to 12 inches ........... 5
Figure 2.3.a - Lower mounting hole dimensions of the AS-1735/SRC antenna ............ 6
Figure 2.3.b - Upper mounting hole dimensions of the AS-1735/SRC antenna ............ 7

AS-1735/SRC VTM-01-003C
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1.0 GENERAL INFORMATION
1.1 Scope
This manual is intended for the purpose of installing, operating and maintaining the AS-
1735/SRC antenna.
1.2 Description
The AS-1735/SRC antenna is a UHF (ultra high frequency) antenna which provides vertically
polarized transmissions and receptions in an omnidirectional radiation pattern across the 225 to
400 MHz frequency range. Optimal operation is achieved when the antenna is mounted on
masts of 12 inches in diameter down to 4 inches in diameter. As an option, the antenna can also
be mounted on masts of 12 inch to 15 inch diameters through the use of Extended Feed Line
Sections in the Lower Feed Assembly. The part number for these Extended Feed Line Sections
is VD-00-00225-2 and they are available on request from the manufacturer (See Section 6 for
contact information).
The AS-1735/SRC antenna is comprised of a four-element array with each element equally
spaced around a central mountable mast. The broadband elements are fed in-phase with each
other and work together to obtain an omnidirectional radiation pattern in the Azimuth plane. The
elements are fed by an integral coaxial line matching transformer and transmission line network
all coupled from a single coaxial input to the antenna. Installation of the antenna is simplified
through the use of flange mounts and standard hardware.
Table 1.1 - Electrical Properties of the AS-1735/SRC Antenna
Operating Frequency Range 225 MHz to 400 MHz
Input Impedance 50 Ohms Nominal
Voltage Standing Wave Ratio (VSWR) 1.8:1 maximum
Gain +2 dB above an isotropic source
Power Rating 2 kW PEP (Peak Envelope Power)
Input Connector UG-352/U
Polarization Vertical
Radiation Pattern Omnidirectional within ±2 dB in the azimuth
plane when mounted on 11" diameters or less

AS-1735/SRC VTM-01-003C
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Table 1.2 - Mechanical Properties of the AS-1735/SRC Antenna
Weight 31 lbs (14 kg)
Finish Epoxy polyamide paint, colour Haze Grey
Mounting Position Vertical mast of 4 to 12 inch (10.2 to 30.5 cm) dia.
*Optional 12 to 15 inch (30.5 to 38.1 cm) dia.
Overall Dimensions 29-3/4 in (wide) x 29-3/4 in (deep) x 28-1/4 in (high)
(75.6 cm (wide) x 75.6 cm (deep) x 71.8 cm (high))
Temperature Storage : -140°F to +158°F (-95°C to +70°C)
Operating : -76°F to +140°F (-50°C to +65°C)
Wind Loading Operating : 75 mph (120 km/h)
Survival : 120 mph (192 km/h)
Shock per MIL-S-910C, Grade A, Class I, Type A
Vibration per MIL-STD-167, Type I
* See Section 6 for contact information

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Figure 2.1 - Identifying the main sections of the AS-1735/SRC
2.0 INSTALLATION
2.1 Unpacking
The AS-1735/SRC antenna is shipped along with two Technical Manuals within the same
shipping container. Carefully pry off the lid of the shipping container to find the antenna and the
two manuals in amongst the packing material. See Figure 2.1. Lift out the top layer of packing
material and carefully remove the antenna. Remove any additional packing material and note
that the antenna has not suffered any damage from shipping.
Note :
The shipping container is reusable.
Save it for repackaging the antenna for further shipments.
2.2 Handling

AS-1735/SRC VTM-01-003C
Valcom Mfg Grp, Inc.
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Care must be taken with the antenna so as not to damage any of the flanges or contacts nor to
chip or scratch the painted surfaces of the antenna. No special handling procedures are
necessary.
2.3 Power Requirements
The As-1735/SRC antenna has an RF power handling capability of 2 kW Peak Envelope Power
in the 225 MHz to 400 MHz range. This is inputted through an LC type, UG-352/U RF
connector which is located at the centre of the Lower Feed Section. No other power sources are
required.
2.4 Cabling
The AS-1735/SRC antenna is designed to mate with the UG-154A/U connector of the
transmission line via a UG-352/U connector. The transmission line should be tied down to the
mast to prevent excessive stress on the connector assemblies of both the transmission line itself
and the antenna.
2.5 Site Preparations
The AS-1735/SRC antenna has been designed for shipboard use and is intended to be installed
around a self-supporting mast of diameters between 4 and 12 inches (up to 15 inch masts can be
supported by special order). The Antenna can also be used in shore applications so long as the
installation requirements laid out in this manual are maintained.
2.6 Installation Requirements
Note :
The optimum installation layout for the AS-1735/SRC antenna is determined on a
ship-by-ship basis. The particular installation plans for the ship should be consulted.
The AS-1735/SRC antenna is designed to be installed around a 12 inch vertical mast. Four
radiating elements encompass the mast, each 90 degrees from each other and joined by a
common feed point. Refer to Figure 2.2 for a visual illustration.