Teledyne 7 RU Chassis, Operation Manual, Page: 64 / 144

64 208528 REV M Operations Manual, 7RU SSPA Chassis
3.9 Reflected Power Option
When this option is installed, the user may measure the amount of reflected RF power pre-
sent at the amplifier’s output flange, with a dynamic range of 12 dB starting at the maximum
RF output.
For example, an amplifier with 50 dBm (100W) of maximum forward RF would be capable of
reading reflected power levels from 38 dBm (6W) to 50 dBm (100W). The amount of reflected
power can be viewed on the Front Panel Display screen:
1. Press the Main Menu key on the front panel;
2. Select 1.SysInfo and press the Enter key.
Note : All Teledyne Paradise Datacom SSPAs are protected from short-term
100% reflected power conditions. Teledyne Paradise Datacom does not recom-
mend operating the amplifier under a sustained condition of 100% reflected
power. The addition of the reflected power sensor option allows the operator to
monitor the amount of reflected power on the amplifier for the purposes of iden-
tifying issues with the transmission signal. The user may set up a Major Alarm
trigger for High Reflected Power conditions in the Teledyne Paradise Datacom
Universal M&C software. This alarm only indicates the presence of the high re-
flected power condition, and will not alter the amplifier settings to compensate
for the condition.
3.9.1 Reflected Power Alarm
Because the reflected power circuitry is not a true VSWR measurement, but simply a meas-
ure of absolute reflected power, it is possible to set an alarm level. In units with the reflected
power monitor option, the alarm level is factory pre-set as a major alarm at 80 percent of the
amplifier’s rated power.
For example, an amplifier with 50 dBm (100W) of output power would have an alarm level set
to 49 dBm (80W).
Note : Teledyne Paradise Datacom does not recommend changing this setting
from the factory pre-set due to possible frequent false alarms that may be gen-
erated if set at a much lower level. However, it is possible to adjust the setting in
the Universal M&C software.