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Operations Manual, HPA2, Compact Outdoor SSPA 205486 REV F 39
SSPA Module Current
Regulator Voltage
Power Supply Voltage
Negative 5v Gate Voltage
Optional Power Supply Temperature
RF Output Power Detector
Analog Gain Adjustment
(1) 10 bit D/A for SSPA Gain Adjustment / Temperature Compensation
20 dB gain adjustment with 0.1 dB resolution
(1) Very Accurate Digital Temperature Sensor
0.5 degree resolution within 1°C of SSPA module case temperature
4.4 Fan Boost Converter
The Fan Boost Converter is a separate DC/DC boost converter that produces a 24 VDC
source from the 12 VDC output of the main power supply. This voltage source is then used to
power the cooling system fans.
4.5 Cooling System
The Compact Outdoor Amplifier’s cooling system represents a landmark in microwave
telecommunication amplifiers. It is a unique system of heatsinks that have been computer
optimized to provide extremely efficient cooling of all of the system’s functional blocks. This
high efficiency cooling system is primarily responsible for the small overall package size and
reduced weight of the unit (as low as 36 lbs or 16.4 kg).
The cooling system is based on a forced convection technique in which the system fans
provide the air intake while the exhaust is brought out around the outer perimeter of the fans.
The fans are 103 CFM rated and operate into approximately 0.7 in. H
2
O back pressure.