HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier Revision 6
Introduction MN/HPOD.IOM
1–2
1.1.1 Features
TheHPOD SSPA baseunit providesfeatures thataretypically offeredas options elsewhere.Its
features include temperature compensation, sample ports, power monitor, field‐replaceable
power factor‐corrected powersupply, and full remote monitor and control capabilities. Higher
powerisavailablethroughtheuseofCEFD1:1and1:2phasecombiningki
ts.
• Solid‐State Advantage: Each HPOD is constructed withhighly reliable gallium arsenide
(GaAs) FETs. With third order inter modulation products from 4 dB to 6 dB better than
TWTAratings,theHPODreplacesTWTAswithsaturatedpowerlevelsofuptotwicethe
HPOD’s rated output. The HPODs also provide a mean tim
e between failures (MTBF)
thatis4to5timesgreaterthanthetypicalTWTAMTBF.
• 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
removeth
esupplyfromtheSSPAmodule.
• Built‐in Redundancy Controller: Each HPOD has the ability to function as a 1+1 (one
backupforoneprimary)and1+2(onebackupfortwoprimaries)redundancycontroller
in the backup mode. The optional redundancy configuration is implemented by
attachi
ng a ganged waveguide/coax transfer switch(es) to the input and output
connectorsoftheamplifierswithacombinationcoaxialcableandwaveguidekit.When
thebackupSSPAiscommandedinto thecontroller mode,itmon itors theonlineSSPA(s )
forfaults.Afaultedonlineunitmaybedisconnectedandreplacedwithoutaffectingthe
onlinepoweramplifier
.
• PhaseCombining:ComtechEFData’sphase‐combinedsystemsallowtheoutputsoftwo
amplifiers to be summed together. A “normal” 1:1 system using 300W amplifiers
provides300Wof outputpower(the offlineunit’s capabilitiesareunusable). Thesame
amplifiers in a 1:1 phase‐combin
ed system provide 600W of output power in normal
operation, and a “soft failure” state of 300W. If no degradation on failure can be
accommodated,athirdamplifiercanbeaddedtoforma1:2phase‐combinedsystem.
• Optional“SmartBUC”Functionality:ComtechEFData’suniqueapproachtoL‐Band/RF
frequen
cy 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
optionalBUCcanlocktoanexternalorinternalreferenceoscillator.
1.2 Functional Description
Each HPOD consists of a CEFD SSPA module with a field replaceable power supply, a field
replaceable fan assembly, and the Monitor/Control Processor (MCP). The amplifier features a
Comtech EF Data low loss combining technique and MCP based temperature versus gain
compensation.
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