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1.2
Functional Description
The compact size and weight of the LGaN 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 and Figure 1-2, CEFD's LGaN is available in several sizes and power levels.
Each LGaN consists of a CEFD Solid State Power Amplifier (SSPA) module with the Monitor/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.
1.3
Features
1.3.1 The Solid-State Advantage
The LGaN is constructed with highly reliable gallium nitride field-effect transistors (GaN FETs). The
LGaNs also provide mean time between failures (MTBF) that is four to five times greater than the typical
TWT MTBF.
1.3.2 Monitor and Control (M&C)
The LGaN includes a microprocessor-based system that provides monitoring and control of the essential
parameters of the unit. The user interfaces with the unit through the M&C system via the remote
control/discrete communications port.
The unit is capable of EIA-232, EIA-485, or Ethernet remote communication. A discrete mute control and
relay status output is also available.
The M&C system monitors the fan speed, unit temperature, all power supply voltages, power transistor
currents, output power, etc. Should a critical monitored parameter fail, the unit will mute the RF signal and
report a fault. The details of the fault can be accessed via remote communication.
1.3.3 Enhanced Standard Features
The LGaN comes equipped with useful features that other manufacturers offer only as options. Included
in the base price are temperature compensation, sample ports (on some models), power monitor, power
factor corrected supply, and full remote monitor and control (M&C) capabilities (including Ethernet and
serial).
1.3.4 "Smart BUC" Functionality
CEFD's unique approach to L-Band/RF frequency conversions eliminates DC and 10 MHz from the input
coax. This simplifies redundant and multi-carrier operation. All units suppor industry standard FSK
modem/BUC communications.
All LGaN models have a self-contained power supply, eliminating the requirement for the modem to
supply the BUC voltage on the center conductor of the RF cable, simplifying multi-carrier operation and
modem spares maintenance.
Introduction
1–2
L-GaN
Revision 0
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