User Manual

Table Of Contents
System Description RF-Orchestra!™ Transmitter Installation and Operation
2-26 6880493G02-C July 2000
Transmitter Peripheral RF Package
Several transmit filtering options are available to minimize interference with other
communications equipment. Filtering requirements are determined by site and customer
system requirements. Options include a single-stage isolator, a bidirectional coupler with
linear detector, and a thermal switch integrated in an isolator load (see Figure 2-15).
This filter/isolator/wattmeter package provides transmitter noise suppression, IM protection,
and post-filter forward- and reverse- power metering. This package protects itself from
damaging voltage standing wave ratio (VSWR) conditions by automatically shutting down if
high reflected power levels are detected.
Figure 2-15: RF Peripheral Equipment Block Diagram
Splitter
Harmonic
Filter
Detector
External
Coupler
Wattmeter
Detector
Combiner Coupler
R1=Band-
pass Filter
Optional RF Filter w/External Wattmeter
Power Level Int Wattmeter
Filtered RF
Forward &
Reverse Power
RF Feedback
Combined RF
Combined RF
To RF-O!
Control
Chassis
From Exciter Module
To RF-O!
Control
Chassis
To Transmit
Antenna
External Wattmeter
Modulated RF
Amplified RF
Modulated RF
2-4
2-4
Power
Amplifier
302SRH-56
RF-Peripheral Equipment
Power
Amplifier