Comtech EF Data KPA - Manual (Page 96)

KPA Ku-Band Indoor Solid-State Power Amplifier Revision 1
Appendix B MN/KPA.IOM
B–10
Case 2. Backup
Æ
Online unit(s)
1. With the Backup Unit forced to be the active unit, adjust the Offset Value in the
CONFIG: Redundancy menu to roughly the difference measured previously. This will
be a positive (+) number.
2. Toggle between the online and Backup Units as being the active path by forcing and un-
forcing a backup through the Backup Unit’s CONFIG: Redundancy Æ SSPA#1 menu.
Make sure the output levels measured are equal. If necessary, re-adjust the Offset Value
until equal levels are measured. (Note that the Backup Unit total attenuation level as now
indicated in the CONFIG: Amp Æ Attenuation menu will be equal to the setting of the
Online Unit plus the Offset Value.)
For Example: Online Unit Output Level 47.00 dBm
Backup Unit Output Level 48.75 dBm
Backup Unit Offset Value 0.00 dBm
Online Attenuation Setting 3.00 dB
AFTER TOGGLING AND ADJUSTING:
Backup Offset Value +1.75 dB
New Equalized Output Level 47.00 dBm
Backup Attenuation Setting 4.75 dB (3+(+1.75) = 4.75)
Section Notes: