Low Power Outdoor (LPOD) Amplifier/Block Up Converter (BUC)
Revision 15
Introduction
1–2
MN-LPOD
1.2
Functional Description
The compact size and weight of the LPOD lends itself to any installation with limited available
mounting space. These include ship-borne antenna systems, small “flyaway” systems, and
Satellite News Gathering (SNG) installations. The addition of the optional internal reference and
LNB bias T facilitates multi-carrier and redundant operations required of small-to medium-sized
hub installations.
As shown in Figure 1-1, CEFD’s LPOD is available in three models:
•
PS 1
•
PS 1.5
•
PS 2
Each LPOD consists of a CEFD Solid State Power Amplifier (SSPA) module with the Monitor and
Control Processor (MCP), a power supply, and a fan assembly. The amplifier features a CEFD
low loss combining technique and MCP-based temperature-versus-gain compensation.
The PS 1 and PS 1.5 models are always configured as a BUC/SSPA (L-Band in, RF out) with
available power levels to 100 W. The PS 2 version can be configured as an integrated BUC/SSPA
or solely as an SSPA (RF in, RF out) at power levels to 250 W.
1.3
Features
1.3.1 The Solid-State Advantage
The LPOD is constructed with highly reliable gallium arsenide field-effect transistors (GaAs
FETs). With third-order intermodulation products that are 4 to 6 dB better than TWT ratings, the
CEFD unit replaces TWTs with saturated power levels of up to twice the LPOD’s rated output.
The LPODs also provide mean time between failures (MTBF) that is 4 to 5 times greater than the
typical TWT MTBF.
1.3.2 Enhanced Standard Features
The LPOD comes equipped with useful features that other manufacturers offer only as options.
Included in the base price are temperature compensation, sample ports (on the PS 2 only), power
monitor, power factor corrected supply, and full remote monitor and control (M&C) capabilities
(including Ethernet and serial).
1.3.3 Built-in Redundancy Controller
The LPOD has the ability to function as a 1:1 (one backup for one primary) redundant controller in a
redundant mode without the use of an external device. The optional redundancy configuration is
implemented by attaching a ganged waveguide/coax transfer switch(es) to the input and output
connectors of the amplifiers, using a combination coaxial cable and waveguide kit.
When the backup LPOD is commanded into redundant mode, it monitors the online LPOD for
faults and status, and automatically maintains a configuration based on the online unit.
A faulted online unit may be disconnected and replaced without affecting the online power amplifier.
