QuadMod SSPAs are completely modular RF amplifier systems that offer output powers of up to 800 watts in C-Band, 700 watts
in X-Band, or 400 watts in Ku-Band. Based on technology used in our field-proven ModuMAX
amplifiers, QuadMod SSPAs utilize field-replaceable RF
modules, power supplies and electronic assemblies to
maximize performance and minimize downtime in
QuadMod Power Options
Since solid-state power amplifiers (SSPAs) consist of
multiple transistors in parallel, they naturally contain a
degree of built-in redundancy. With proper attention to
design architecture, the use of multiple parallel RF modules,
and the elimination of all active devices from the common
RF path, GD Satcom has designed an SSPA that is reliable
and extremely fault-tolerant.
RF Plug-In Modules
QuadMod SSPAs consist of four identical and fully interchangeable
RF plug-in modules. Module status is indicated
by an LED on each module as well as the control panel
Complete failure of a module causes a drop of only 2.4 dB in
output power, without the momentary loss of signal caused
by redundant switchover systems. Defective modules can
be hot-swapped while the SSPA continues to operate. Spare
RF modules are affordable, since they contain only a
fraction of the RF power transistors in the SSPA.
Easy to Operate and Maintain
QuadMod SSPAs are designed to be easy to operate and
maintain. Commonly used controls are brought out to the
front panel for quick and easy access. All features are fully
remote controllable through the standard RS-232/-422/-485
and network interfaces.
Servicing is fast and easy with four hot-swappable RF
modules that are accessible from the front panel. Modules
can be removed and replaced while the SSPA continues to
Any of the four fans in the air-cooling system can be easily
removed and replaced, without taking the SSPA off-line.
Even the power supply is N+1 redundant, consisting of
three hot-swappable plug-in modules, any two of which
are fully capable of powering the entire amplifier.
QuadMod is easy to expand. Phase-combine two SSPAs
for double the power output in only 35" (20 RU) of rack
space. An added bonus—with 8 RF modules, one failed
module causes only a 1.2 dB drop in output power.
Outline Drawing, Typical C-Band SSPA
QuadMod also incorporates redundancy into its integral
forced-air cooling system. Enough margin is built into the
design to tolerate the loss of one cooling fan. Fans are
monitored for rotational speed, and failure of a fan is
indicated on the control panel display. In the event of a
fan failure, the SSPA can continue to operate until a
replacement is installed. The air cooling system utilizes
separate front panel air intake and rear panel exhausts.
Exhaust air can be ducted outdoors or into the room.
System power is supplied by three identical modules in an
“N+1” configuration. If a module fails, the remaining two
can supply 100% of the required load current and the
defective module can be hot-swapped without
interruption. QuadMod operates from either single- or
three-phase ac, allowing considerable flexibility in
installations and worldwide operation.
Global EMC and Safety Compatibility
QuadMod SSPA systems are certified to applicable EU
EMI/EMC and safety standards.