Andrew 174100, Installation And Maintenance Manual

Page: 9 / 90

9
SECTION 1
1. GENERAL DESCRIPTION and THEORY OF OPERATION
1.1 SCOPE
This instruction book contains theory of operation and information for the installation, operation and
maintenance of the Primary Surveillance Radar S-Band Antenna (ASR 11).
1.2 PURPOSE OF EQUIPMENT
The S-Band reflector type antenna, called the Primary Surveillance Radar (PSR) Antenna is used in
transmitting and receiving RF energy for Air Traffic control and for supporting a Large Vertical
Aperture (LVA) Secondary Surveillance Radar (SSR) Antenna.
1.3 EQUIPMENT SUPPLIED
The antenna assembly consists of the equipment, subassemblies and kits listed in Table 3-1. Figure
3-1 shows the complete Antenna assembly.
1.4 PHYSICAL DESCRIPTION
The antenna assembly uses materials, coatings and finishes inherently resistant to corrosive
environment. Intended as the strongest link in the radar system, the antenna requires minimum
maintenance. It is designed to facilitate removal and replacement of any faulty portion except the
reflector and pedestal with equipment furnished as part of the system.
1.4.1 Antenna
The antenna unit, having no standby assembly, is designed to be highly reliable and capable of
withstanding adverse weather conditions. Aluminum construction is used throughout, except the
base, feed support, horn radomes, etc., that require other materials. Special paints are used to give the
assembly maximum life, even in regions where air is heavily polluted.