Operations Manual, HPA2, Compact Outdoor SSPA
208495 REV B
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4.3.8 Serial I/O Control (J4)
For serial data control of the Compact Outdoor SSPA, a Windows-based Monitor &Control
program is supplied with the amplifier that allows all of the control and alarm functionality over
a serial communication link.
Both RS-232 and RS-485 can be used to communicate with the amplifier. The amplifier
default is to operate on RS-485 but can easily be set to RS-232 by pulling the RS-232/RS-485
Select line low. This is done by connecting J4-Pin D to J4-Pin V.
Communication Links using RS-232 are typically good up to 30 ft. (9 m) in length.
Installations exceeding this length can use the RS-485 mode which will allow serial control up
to 4000 ft. (1200 m).
The Compact Outdoor Amplifier is supplied with a Quick-Start cable in which this connection
is already made. This allows the user to quickly setup the amplifier and verify its operation.
The other side of the cable has a 9-Pin female D connector that mates with most notebook
and desktop personal computers. A Quick-Start Ethernet cable is also available.
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 tele-
communication amplifiers. It features 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 (approximately 36 lbs or 16.4 kg).
The cooling system is based on a forced convection technique in which the system fans pro-
vide the air intake while the exhaust is brought out around the outer perimeter of the fans.
The fans provide a maximum air flow of 103 CFM each (maximum air pressure of 0.691
inches H
2
O at zero air flow) and produce 54.0 dB-A measured at a distance of 1 meter from
the fan intake.
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