Glenayre Document Number: 9110.01002
GL-T8541 PA
09/10/99
DESCRIPTION
t8541
p3.
fdk
Copyright © 1997 Glenayre
Page: 3-1
3
DESCRIPTION
3.1 General
Glenayre’s GL-T8541 power amplifier is designed for FM operation in the 450-MHz band.
RF output is continuously adjustable from 100 to 250 watts; it is driven by a 250 mW (25
+/-2 dBm) source (the DSP exciter). Refer to section 2 for specification-related informa-
tion.
Refer to Figure 3-1, for an overall view of the PA.
3.1.1 Features
The power amplifier exhibits the following features:
• adjustable power output
• continuous operation at rated output
• slide mounts for the power amplifier module and DSP exciter, which allow easy access
and replacement
• current monitoring circuitry (metering board)
• overcurrent protection
• VSWR protection
• modular construction
• status output to exciter
3.2 Physical Description
Refer to Figure 3-2 for board locations in the GL-T8541 PA. Refer to Table 3-1 for pc as-
semblies and part numbers.
3.2.1 Electrical Connectors
The PA module has two type-N connectors for RF input and output and one DB-15 type for
control and monitoring signals. The +dc power cable from the power supply connects to the
metering board. The dc return cable from the power supply as well as the chassis ground
connect to the rear of the PA module.
3.2.2 Chassis Cooling
Forced-air circulation is through the front panel, using a dc fan mounted on the rear panel
of the PA. The air is pulled from front to back over the PA heat sink. The power amplifier
is self-protected against overheating by a temperature sensor which is in contact with the
PA heat sink. The temperature sensor is mounted on the combiner board. Do not operate
the PA in the event the cooling fan should fail.
