User's Manual

044-05156 Rev C 6
Major System Components
Model Manual Description
Quantity
per system
044-05156 Reference Manual
044-05162 Maintenance & Troubleshooting Manual
044-05163 Site Preparation & Installation Manual
OPAF-1923-P07C01
044-05164 Field Replaceable Units Manual
1
G3S-1900-125 044-05122 MCPA 6
MCR21929-1-2 044-05121 Subrack 3
800-08824-001 System Interface Module 1
800-09088-001 Fan Interface Module 1
930-00018-005 * 148-Amp Rectifier 3
920-00360-002 * Low Voltage Disconnect 1
920-00337-003 Back-Up Battery 4
TPL-CZ ** Fuse, 600A, 170 VDC or less 2
* Manufactured by Cherokee International
** Manufactured by Bussmann
®
Telpower
®
, Cooper Bussmann, Inc. St. Louis, MO
4. System Functional Description
The OPAF-1923-P07C01 is an AC powered, linear, feed-forward multicarrier power amplifier system that operates
in the 60 MHz frequency band from 1930 MHz to 1990 MHz with an instantaneous bandwidth of 25 MHz. It consists
of:
• One outdoor enclosure assembly.
• Up to six model G3S-1900-125 amplifiers (two per sector, each mounted in an MCR21929-1-2 two-way subrack).
• Six
Duplexer Low Noise Amplifier modules
• Four 930-00018-005, 148-amp rectifiers.
• One Low Voltage Disconnect system.
• Four 12 Vdc 105 AH Batteries .
• System Interface Module
Designed for outdoor use, the IP54 rated enclosure is a sturdy aluminum cabinet with front and rear locking
ventilating doors. Access to the RF, and alarm cabling is located at the lower sides and rear of the enclosure.
Access to the AC power cabling is located at the left side AC panel of the enclosure
The enclosure protects the Powerwave equipment from the outdoor elements as well as housing the System
Interface Module (SIM) and the electrical interface for the 148-amp rectifiers and G3S-1900-125 MCPAs
(Multicarrier Power Amplifiers).
The all solid-state G3S-1900-125 plug-in amplifier module MCPAs, , are designed to produce high-peak power
output. The modular construction and unique and highly effective Light Emitting Diode (LED)-based operation and
fault indicators always display the current operating status of the amplifiers. The turn-on and turn-off sequence of
voltages are fully automatic, as is overload protection and recycling. A nominal 52-Amps of current is required for
the G3S-1900-125 amplifier at rated output power.
Each of the three MCR21929-1-2 subracks, contain up to two MCPAs. The MCPA outputs are combined to provide
one composite output per subrack. Each subrack is equipped with an Automatic Power Control (APC) circuit and an
RF GAIN ADJUST potentiometer. The APC indicator and GAIN ADJUST potentiometer are located on the upper-
right front of the subrack. Each subrack provides two RS-485 alarm interface ports, a preamp alarm interface port,
a Form-C alarm interface port and an RS-232 maintenance port, as well as, RF IN, RF OUT and a –50dB RF
sample port.
The 148-amp rectifiers and associated subracks require primary input power between 176 to 264 Vac. The rectifier
converts the AC input power to the +27 VDC for use by the system. The system design provides 12 minutes of
battery backup time with P/N 920-00337-003
batteries under a full operational load (3 hrs 30 mins. under a light load). A
Low Voltage Disconnect (LVD) monitors the output voltage of the battery system and disconnects the batteries from the circuit