3 RU SSPA Chassis Operations Manual
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2.5 Reflected Power Option
When this option is installed, the user may measure the amount of reflected RF power
present 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 ca-
pable 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 recommend 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 identifying 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 reflected
power condition, and will not alter the amplifier settings to compensate for
the condition.
2.5.1 Reflected Power Alarm
Because the reflected power circuitry is not a true VSWR measurement, but simply a
measure 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 generated if set at a much lower level. However, it is possible to
adjust the setting in the Universal M&C software.
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