Comtech EF Data XPA-200 Installation And Operation Manual page 33

XPA200-7984-I-OPT1, X-Band SSPA
2.3.1 Redundant Operation and Setup
The system can operate in a standard 1:1 redundant
configuration by choosing VPC position 1 (SSPA A to antenna) or 3
(SSPA B to antenna) on the Mitec 2723B.
2723B was set to run in Automatic mode and SSPA A was normally
operating to the antenna (VPC position 1), a fault on SSPA A would
cause the system to immediately switch to postion 3, or SSPA B to
antenna.
Each SSPA may have slightly different gain values.
procedure to equalize gain and output power between SSPA A and SSPA
B for redundancy operation is described below.
from SSPAs A and B are first equalized by measurements at the load
port before switching power to the antenna port.
A. To set the output power of SSPA A:
1.
prevent unwanted power from SSPA B going to antenna.)
2.
3.
measuring port (see 2723B test data for exact calibration
data).
adjusting input RF power or by using the SSPA A attenuation
setting.
B. To set the output power of SSPA B:
1.
prevent unwanted power from SSPA A going to antenna.)
2.
3.
measuring port (see 2723B test data for exact calibration
data).
(usually the same as A) by adjusting input RF power or by
using the SSPA B attenuation setting.
C. Choose the unit desired to be on-line.
1.
the antenna.
2.
operation to the antenna.
the load.
3.
SSPAs.
4.
connecting a power meter to the Mitec Antenna Forward power
measuring port (see Mitec test data for calibration factor).
XPA200-7984-I-OPT1, Rev.2
Mute SSPA B via remote or front panel controls.(To
Set VPC to position 3 (B to antenna, A to load).
Connect a power meter to the Mitec calibrated load
Adjust output power of SSPA A to desired level by
Mute SSPA A via remote or front panel controls.(To
Set VPC to position 1 (A to antenna, B to load).
Connect a power meter to the Mitec calibrated load
Adjust output power of SSPA B to desired level
Mute both units to prevent unwanted power from going to
Choose SSPA A (position 1) or SSPA B (position 3) for
Set the Mitec unit in Automatic mode and un-mute the
Verify proper output power going to antenna by
For example, if the Mitec
The output powers
The other unit will be sent to
Installation
A
2-5