Comtech EF Data HPOD Installation And Operation Manual page 140

HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
Appendix B
different than the attenuation value of the online unit to compensate for any gain mismatch
between the BU and online units.
To calibrate:
1. After proper operating levels have been established in online SSPA 1 and 2, store their
attenuation settings using the SBO= command in the backup unit.
For example
SSPA 1, the active SSPA, requires 15.00 dB of attenuation.
SSPA 2, the BU unit, requires 10.00 dB: Enter the remote commands SBO=1,15.00 and
SBO=2,10.00 to store these values.
2. Send the FBU=1 command to the BU unit. This will force the BU unit to replace SSPA 1. The
BU unit will read the setting stored by the SBO=1 command (in this example, 15.00) and
apply this value to its own attenuation setting. This value can now be tuned to compensate
for any gain mismatch.
For example, if the output power is 1 dB too high in this state, send ATT=16.00 to the BU
unit. If the Tx level is now correct, send SBO=1,16.00 to the BU unit.
Repeat the above process to achieve desired level matching and for SSPA 2.
B–4
Revision 6
MN/HPOD.IOM