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ARMA-C250-CRM
2. GENERAL INFORMATION
2.1 INTRODUCTION
This manual contains information required to install and operate the Redundant 250 W, C-Band
Rack-mount Solid State Power Amplifier Model # ARMA-C250-CRM, in a 1:1 redundant
configuration.
2.2 DESCRIPTION
The ARMA-C250-CRM includes two 250 W solid state power amplifiers (SSPA) and a
waveguide switching unit for 1:1 redundant operation. Each SSPA incorporates a DC main
power supply and a forced air cooling system. Each SSPA features an RS-485 interface that
provides full remote monitor and control of selected functions. A product outline drawing of a
redundant system is shown in Figure 1 at page 12 & Figure 2 at page 13. The functional block
diagram of a single solid state power amplifier is shown in Figure 3 at page 14 and a functional
block diagram of the redundant system is shown in Figure 4 at page 15.
2.2.1 P
S
OWER
UPPLY
The main power supply provides a DC high current output to the HPA (High Power Amplifier),
a low current output to the secondary power supply and to two filtered, low current supplies for
operation of the four fans. The secondary power supply has multiple outputs for operation of the
Monitor and Control Assembly and the front panel display. The main power supply is configured
for operation from 220V AC. The fans are configured for 48V DC.
2.2.2 HPA A
SSEMBLY
The HPA Assembly amplifies the RF input signal to a level sufficient for transmission. Integral
to this module are low noise and power amplifier sections as well as variable attenuation sections
that are used for temperature compensation and gain control. Other functionality includes
internal power conditioning, temperature monitoring & high temperature shutdown.
2.2.3 M
C
A
ONITOR AND
ONTROL
SSEMBLY
The MCA (Monitor and Control Assembly) monitors all the important operating parameters of
the system, and communicates externally via serial and discrete interfaces as well as the front
panel controls and display.
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