Operations Manual: HPAC-100/125/150/200/250-RM SSPA
B-1
Appendix B
Operation of a 1:1 Redundant HPAC-100/125/150/200/250-
RM
Introduction
Two HPAC-100/125/150/200/250-RM units can be connected in a one for one (1:1)
redundant configuration. This configuration automatically switches in an operating
amplifier if the on-line amplifier develops a system fault. Because each amplifier
contains a microprocessor, an additional controller is not required. Only one serial
connection is necessary for remote operation of the system. The amplifiers commu-
nicate to each other using the Interface cable.
Two HPAC-100/125/150/200/250-RM amplifiers are connected to each other and to a
waveguide/coaxial switch. One of the amplifiers is designated as being “on-line”
while the other is “standby”. The on-line amplifier receives the input RF signal and
amplifies it while the standby amplifier input and output are terminated into 50 ohm
loads. When the system is in “AUTO” mode, if a summary fault develops within the
on-line amp, the waveguide/coaxial switch changes position to put the non-faulted
standby amp on-line. The entire process takes nominally 200ms. If a problem oc-
curs during switching a system summary fault, switch fault, is issued.
This Appendix describes how to control the redundant system from the front panel of
either amplifier or via the serial port.
An outline drawing of the system is shown in Figure B-1.
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