Comtech EF Data HPOD, Installation And Operation Manual

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HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
Revision 9
Appendix B B–2 MN/HPOD.IOM
To calibrate, do these steps:
Step Task
1 Identify the unit with the most gain.
2 Calculate the actual error.
3 To compensate for the error, set the GOF= command in the unit having the highest error. For
example – If SSPA 1 has 70 dB of gain, and BU SSPA 2 has 72 dB, send the GOF=2.00
command to the BU SSPA 2 to store these values.
B.1.2 1:2 Redundancy Mode
Figure B-1 shows the block diagram for an HPOD 1:2 Redundancy System. For the purpose of
example, this figure shows a C-Band system.
Figure B-1. HPOD C-Band 1:2 Redundancy System Block Diagram
In 1:2 redundancy mode there is a dedicated B ackup U nit (designated as BU ) as determined by the
cable position. In this configuration, the BU is responsible for monitoring the two online units for
communications and summary faults.
While the BU is constantly monitoring both units for their status, if either has a fault, use the last
(good) status as the configuration for the BU before the BU goes online. Once the BU goes
online, the redundancy auto/manual status reverts to manual mode, and the BU stays online until
reset by the user.
The user may reset the system by issuing a FBU=0 command to place the units back into auto
mode. When issuing this command, the BU then switches back to the “normal” configuration of
SSPAs 1 and 2 online.