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4 SPECIFICATIONS
Set Output Power
Step
4
4
Specifications
4.1
Description
The power amplifiers are designed for use with the T150 series transmitters to
provide 50-150 watts output.
Output power regulation is provided by connecting the output of the directional
coupler to the ALC input of the T150. the drive from the transmitter is then
automatically adjusted to maintain the required output.
The regulated power level can be preset over a wide range from 25 to 150 watts
depending on the available driver power.
Sensing circuits are provided to protect the output transistors from excessive
temperatures. If the output transistor case temperature rises to 90 degrees C, the
input drive will be reduced to prevent damage.
4.2
Physical Configuration
The power amplifier is designed to fit in a 19 inch rack mounted frame. The
installed height is 4RU (178mm) and the depth is 350mm. The amplifier is
95.25mm or three Elcipse modules wide.
An extruded aluminium heat sink with vertical fins is used. The temperature rise
is normally less than 30 degrees at 50 watts output.
4.3
Front Indicators and Test Points
4.3.1
Indicators
Power ON - Green LED
RF Power Output - Yellow LED
Over Temperature - Red LED
RF Technology PA150
Input
As above
Measure
RF output power at
J2
Adjust
Key transmitter.
Adjust RV2 for the
desired power
Page 7
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