Operating instructions

User Interfaces DMD20/DMD20 LBST Universal Satellite Modem
4-10 TM103 – Rev. 2.8
LO FREQ (MHz) Allows the user to enter the Local Oscillator frequency of
the BUC LO in order for the uplink frequency to be
displayed correctly (refer to the BUC manufacturer’s
specifications).
When utilizing BUC that supports FSK, the modem will display LO
frequency as stated by the BUC.
OSC SIDE BAND {LOW SIDEBAND, HIGH SIDEBAND}
Allows the user to select the location of the BUC LO.
The user must enter the location of the BUC LO in order
for the UPLINK FREQUENCY to be displayed correctly.
The BUC LO can be either higher or lower in frequency
than the BUC output frequency. If the BUC LO is higher
in frequency then the user must enter HIGH SIDEBAND.
10 MHz BUC REF {ENABLED, DISABLED}
Allows the user to enable or disable the 10 MHz BUC
reference clock.
BUC VOLTAGE {ENABLED, DISABLED}
Allows the user to enable or disable the BUC supply
voltage.
LOW ALARM THRSH {0.00 Volts}
Allows user to select lower alarm limit/threshold for BUC
voltage.
HI ALARM THRSH {0.00 Volts}
Allows user to select high alarm limit/threshold for BUC
voltage.
LOW ALARM THRSH {0.00 Amps}
Allows user to select lower alarm limit/threshold for BUC
current.
HI ALARM THRSH {0.00 Amps}
Allows user to select high alarm limit/threshold for BUC
current.
CARR DLY (SEC) {0 to 255}
Allows the user to select the time delay after power-up
before the Tx Carrier may be enabled. This allows time
for the BUC to stabilize.