Comtech EF Data KPA - Manual (Page 95)

KPA Ku-Band Indoor Solid-State Power Amplifier Revision 1
Appendix B MN/KPA.IOM
B–9
B.4.1 Case Examples
Case 1. Backup
Å
Online unit(s)
1. Ensure the Online Unit attenuation is set to a value in dB greater than or equal (
≥ ) to the
difference in levels measured above.
2. With the Backup Unit forced to be the active unit, adjust the OFFSET value in the
CONFIG: Redundancy Æ SSPA#1 menu to approximately the difference measured
previously. This will be a negative (-) number.
3. 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.
Ensure the output levels measured are equal. If necessary, re-adjust the Offset Value until
equal levels are measured. (Note that the Backup Unit’s total attenuation level as now
indicated in the CONFIG: Amp Æ Attenuation menu will be equal to the setting of the
Online Unit less the OFFSET value.)
For Example: Online Unit Output Level 47.00 dBm
Backup Unit Output Level 45.25 dBm
Backup Unit Offset Value 0.00 dBm
Online Attenuation Setting 3.00 dB (must be >1.75 dB)
AFTER TOGGLING AND ADJUSTING:
Backup Offset Value -1.75 dB
New Equalized Output Level 47.0 dBm
Backup Attenuation Setting 1.25 dB (3+(-1.75) = 1.25)
Section Notes: