Comtech EF Data HPCST-5000 - Manual (Page 162)

Programming Guide for Redundant Controller High-Power TWTA Satellite Terminals
A–14 Rev. 1
F Increment/Decrement Calibration Factors. This command will increment or decrement the factory set
calibration factors for the auxiliary RF power sample command ports. This command is intended for use in
the event a customer supplied diode detector is installed on one of the auxiliary RF sample ports. The
“new” diode can then be calibrated by attaching a thermistor to the sample port and measuring power then
connecting the diode and adjusting the internal calibration factor.
Note: The diode must be a positive output device or externally conditioned to look like one, maximum input
voltage +5 VDC.
Input: 6 bytes of data.
Byte 1 selects the auxiliary RF sample port to be recalibrated.
Selects port “A” (typically used for forward power)
Selects port “B” (typically used for reverse power)
Selects port “C” (typically used for load power)
Byte 2 selects positive or negative increments.
<+> Increment positive calibration
<-> Increment negative calibration
Bytes 3 to 6 determine the increment in XX.X dB.
P Set Power. This command determines the setting of the output power of the backup TWTA when it is
changed from the backup to the primary position.
Input: 1 to 5 bytes of data.
<0> Turns function OFF
<1XX.X> Sets power for the RF #1 Chain Output
<2XX.X> Sets power for the RF #2 Chain Output (1:2 Systems)
<3XX.X> Sets power for the RF #3 Chain Output (1:3 Systems)
<4XX.X> Sets power for the RF #4 Chain Output
UPS Enable. This command activates the controller main power failure mode.
For a redundant HOT standby system backed up by a UPS, it is advisable to set the off-line TWTA’s high
voltage OFF during the main power failure. This dramatically decreases the power reserve required in the
UPS. In the UPS Enable mode of operation the controller turns off the off-line TWTA(s) high voltage when a
prime power failure occurs.
There are two software adjustable time delays:
• Delay before off-line TWTA high voltage is shut OFF after the fault occurs
• Delay before high voltage is turned on after restoration of prime power
Input: 1 to 10 bytes of data.
<0> Disables UPS command
<1XXXX,YYYY> Enables UPS command; sets the first time delay to XXXX seconds and
the second time delay to YYYY seconds