AS-1735/SRC
VTM-01-003C
Valcom Mfg Grp, Inc.
-1-
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
