Glenayre Document Number: 9110.00160
250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96
DESCRIPTION
Print Date: 12/17/96
Copyright © 1996 Glenayre
Page: 3-5
3.3
Functional Description
Figure 3-3
shows a simplified, functional diagram of the PA. The driver, combiner, and PA
boards constitute the RF amplifier circuitry of the PA. Monitoring and controlling this RF
amplifier is the metering board.
Figure 3-1
shows the RF amplifier, isolator, and metering
circuitry within the PA.
Figure 3-3 PA Simplified-Block Diagram
3.3.1
RF Amplifier
The RF amplifier receives its RF input through the BNC connector P3. A detector circuit
in the RF amplifier monitors this RF input. The RF input is amplified by means of four
amplifier stages. Each amplifier stage receives its dc input power through the metering
circuit. Power detectors at critical locations throughout the RF amplifier provide sample
voltages to the metering circuit. The amplified output of the RF amplifier is applied to the
input type-N connector on the isolator.
3.3.2
Isolator
The isolator prevents intermodulation of the RF signal that may occur from nearby trans-
missions. The RF signal is routed through input and output type N connectors. A detector
circuit in the isolator monitors the reflected power (VSWR) present at the output type-N
connector. A sample voltage representing the VSWR level is output through the BNC
connector. The optional triple isolator functions identically to the standard isolator except
with a higher level of intermodulation prevention.
BNC
STATUS/
CONTROL
RF
AMPLIFIER
RF
IN
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ISOLATOR
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RF
OUT
METERING
METERED
POWER
STATUS
VOLTAGES
DC
IN
25V
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13.5V
TYPE N
TYPE N
DB-15
VSWR
SAMPLE
BNC
1/4 LUGS
P2
POWER
AMPLIFIER
