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OVERVIEW
The PA-2204 is a high-efficiency class AB power amplifier with the linearity
of a class A design. This modular designed unit uses silicon DMOS devices
in its 300-watt power modules. Two power modules are combined to provide
a full 400-Watts PEP and average continuous output. A microprocessor monitors
"housekeeping" functions such as voltage, current, and temperature
sensing, and forward and reflected power. A multi-range low-pass filter suppresses
harmonics. The unit is powered from its internal power supply. The 400W PA-2204 is a member of the URG-III product line family of HF
communications equipment. It is designed for use with the RT-2200 Digital
Signal Processing Receiver-Exciter.
DESCRIPTION
A block diagram of the PA-2204 is shown. An input signal splitter drives
two identical 300-W RF amplifier modules. The RF amplifier module is designed
with silicon DMOS devices which give the power amplifier its high efficiency
and linearity. The two RF power modules are combined to provide a full 400-Watts
PEP and average continuous output. An 8-band low-pass filter suppresses harmonics. The control card uses a microprocessor to manage several tasks including
the serial control interface, internal "housekeeping" functions,
and built-in test. The control card provides selectable EIA-232/485/422 serial interfaces
for an external exciter. Critical internal parameters such as voltage, current,
and temperature sensing, and forward and reflected power are sampled for the
control card. The microprocessor uses these digitized samples to continuously
monitor the status of the power amplifier and for diagnostics during built-in
test. Parameter values, status, and built-in test results are reported to
the exciter over the serial interface. Internal blowers ensure proper cooling of
the entire assembly
SPECIFICATIONS
| Parameter | Performance | Electrical | Frequency
range | 1.6
to 29.99999 MHz | Power output | 400-Watts
PEP and average | Frequency
change time | 50
milliseconds max | 3rd order IMD | >
36 dB below PEP | Harmonics | -63 dBc or better
into 50-ohm load | Spurious | -60
dBc or better at up to 5% from operating frequency -80 dBc or
better at greater than 5% from operating frequency | VSWR | full rated power
into 1.3:1 VSWR operates at reduced power 1.3:1 to 3:1 VSWR protected
for VSWR > 3:1 | Indicators | Forward
& reflected power meter VSWR fault Over-temperature | Operating
mode | class
AB | Prime Power | 115
V ac or 230 V ac 1-phase | Environmental | Cooling | forced
air, internal fans | Operating
Temperature | 0
to +50 C at mean sea level, derated linearly to -20 C at 10,000 feet above
mean sea level | Storage Temperature | -40 to +60 C° | Physical | Height | 10.5
inches (267 mm) | Width | 19.0 inches (483
mm) | Depth | 22.0
inches (559 mm) | Weight | 70 pounds (31.8
kilograms) |
SELECTION GUIDE
| Description | Part Number | PA-2204
Power Amplifier (230 VAC Power) | 270-2616-150 |
The PA-2204 includes:
SUPPORT OFFERINGS
Product Information Material is normally available at no charge and
can be obtained by contacting GS Customer Relations:
Phone: 800-321-2223 or 319-295-5100
Fax: 319-295-4777
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