Case Examples - Comtech EF Data KPA-040 Installation And Operation Manual

KPA Ku-Band Indoor Solid-State Power Amplifier
Appendix B
B.4.1

Case Examples

Case 1. Backup
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
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
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
Online Unit less the OFFSET value.)
For Example:
Section Notes:
Online unit(s)
SSPA#1 menu to approximately the difference measured
Attenuation menu will be equal to the setting of the
Online Unit Output Level
Backup Unit Output Level
Backup Unit Offset Value
Online Attenuation Setting
AFTER TOGGLING AND ADJUSTING:
Backup Offset Value
New Equalized Output Level
Backup Attenuation Setting
B–9
Revision 1
MN/KPA.IOM
SSPA#1 menu.
47.00 dBm
45.25 dBm
0.00 dBm
3.00 dB (must be >1.75 dB)
-1.75 dB
47.0 dBm
1.25 dB (3+(-1.75) = 1.25)