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Operations Manual: HPAC-100/125/150/200/250-RM SSPA
3 Operation of Stand-Alone Unit
Low RF Power
The Low RF Power fault alerts the user when the output power falls below the threshold
value. Due to the sensitivity of the power monitor diode, do not set the threshold value
more than 15 dB below the rated output power. Also, the Low RF Power threshold must
be less than the High RF Power threshold. Regardless of whether this fault is included
in the summary alarm, the threshold value must be set to control the RF Output LED on
the front panel.
High RF Power
The High RF Power fault alerts the user when the output power is above the specified
level. The threshold cannot be greater than 1 dB higher than the rated output of the
amplifier and must be greater than the Low RF Power threshold.
High Temperature
The High Temperature fault alerts the user when the unit temperature is above the
specified level. It does not cause RF muting. In addition to the user selectable fault,
a factory set Over Temperature Shutdown fault exists. The Over Temperature Shut-
down fault occurs when the temperature of an RF unit exceeds a factory set tem-
perature in order to prevent component damage due to excessive heating. When an
Over Temperature Shutdown occurs the unit is automatically muted and a fault is
indicated until the temperature falls below the High Temperature Threshold value set by
the user. The user must manually unmute the amplifier when the fault is no longer regis-
tered. If the fault continues to occur, a problem may exist with the system fans or the unit
may be operating in too high of an ambient temperature.
Auxiliary Input
The Auxiliary Input fault is intended for use with external transmit equipment such as
converters or modems. This feature is used when input switching is not employed and
it is desirable to switch the entire converter/amplifier chain when either an amplifier or
converter faults. The proper converter summary fault can be brought into the SSPA
through the Auxiliary Input connection located on the parallel port connector. The logic
required at the Auxiliary Input connector is open on fault or ground for no fault.
High Reflected Power (optional)
The High Reflected Power fault alerts the user when the reverse power is above a
specified level. The threshold cannot be greater than 1 dB above the rated output of
the amplifier or lower than 15 dB below the rated output power.
Summary of Contents for HPAC-100-RM
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