Comtech EF Data HPOD, Инструкция по установке и эксплуатации

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HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
Revision 9
Introduction 1–2 MN/HPOD.IOM
1.2 Features
The HPOD SSPA base unit provides features that are typically offered as options elsewhere. Its
features include temperature compensation, sample ports, power monitor, field-replaceable power
factor-corrected power supply, and full remote monitor and control capabilities. Higher power is
available through the use of Comtech 1:1 and 1:2 phase combining kits.
1.2.1 Solid-State Advantage
Each HPOD is constructed with highly reliable gallium arsenide (GaAs) FETs. With third order
intermodulation products from 4 dB to 6 dB better than TWTA ratings, the HPOD replaces
TWTAs with saturated power levels of up to twice the HPOD’s rated output. The HPODs also
provide a mean time between failures (MTBF) that is 4 to 5 times greater than the typical
TWTA MTBF.
1.2.2 Field-Replaceable Power Supply
Recognizing that the MTBF limiting factor for almost all electronic equipment is the power
supply, the HPOD provides for easy field replacement. Simply disconnect the AC mains,
release the captive fasteners, and remove the supply from the SSPA module.
1.2.3 Built-in Redundancy Controller
Each HPOD has the ability to function as a 1+1 (one backup for one primary) and 1+2 (one
backup for two primaries) redundancy controller in the backup mode. The optional redundancy
configuration is implemented by attaching a ganged waveguide/coax transfer switch(es) to the
input and output connectors of the amplifiers with a combination coaxial cable and waveguide
kit. When the backup SSPA is commanded into the controller mode, it monitors the online
SSPA(s) for faults. A faulted online unit may be disconnected and replaced without affecting
the online power amplifier.
1.2.4 Phase Combining
Comtech’s phase-combined systems allow the outputs of two amplifiers to be summed
together. A “normal” 1:1 system using 300W amplifiers provides 300W of output power (the
offline unit’s capabilities are unusable). The same amplifiers in a 1:1 phase-combined system
provide 600W of output power in normal operation, and a “soft failure” state of 300W. If no
degradation on failure can be accommodated, a third amplifier can be added to form a 1:2
phase-combined system.
1.2.5 Optional “Smart BUC” Functionality
Comtech’s unique approach to L-Band/RF frequency conversions eliminates DC and 10 MHz
from the input coax. This simplifies redundancy and multi-carrier operation. It offers full 13.75
GHz to 14.5 GHz Ku-Band coverage and supports industry standard FSK modem/BUC
communications. The optional BUC can lock to an external or internal reference oscillator.