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Digital Satellite Terminal System
Operation
TX Side Setup:
Step
No.
13.
Disconnect BUC.
14.
Determine the ODU voltage required by the BUC and record for reference
15.
Turn the ODU Power = ON and Verify the BUC/ODU Voltage is correct.
The ODU voltage sent to the BUC is verified two ways per the next step.
16.
The ODU voltage is reported under the Monitor Menu.
To avoid damage to the BUC, confirm voltage matches the BUC voltage
requirement. (Typical Voltage is +24 or +48 VDC ± 5%)
17.
To protect the equipment, select the ODU Power = OFF. This is necessary
before connecting the L-Band coaxial cables to the unit
18.
Set the TX Terminal LO (MHz) and MIX (+ or -). The LO frequency is the
BUC local oscillator frequency and the MIX is.
Mix = "-" if the BUC LO > Satellite Frequency
Mix = "+" if the BUC LO < Satellite Frequency
19.
Set Mod Spectrum to Normal or Invert.
20.
Program the satellite frequency under the TX Terminal Frequency menu
21.
Set the TX Power Level to a safe (low) value
22.
Turn TX carrier to Off.
23.
Connect BUC.
24.
Turn TX reference to On.
25.
Turn TX ODU power to On.
26.
To automate warm up and delay carrier turn ON for a programmed delay
after prime power is applied see the ODU Output Delay menu.
27.
Record the nominal BUC current after the unit is warmed up and
functioning normally.
28.
Set the High alarm about 20% higher than nominal
29.
Set the Low alarm about 20% to 40% lower for the ODU (BUC).
At this point, the unit will start transmitting when the TX-IF output is tuned On
(under Configuration: Modulator menu).
IMPORTANT
5.4
Initial Operation of the Modem with the ODU and LNB
RX Side Setup:
Step
No.
30.
Disconnect LNB.
31.
Set the RX Terminal LO (MHz) and MIX (+ or -). The LO frequency is the BUC
local oscillator frequency and the MIX is.
Mix = "-" if the LNB LO > Satellite Frequency
Mix = "+" if the LNB LO < Satellite Frequency
32.
Set Demod Spectrum to Normal or Invert.
33.
Program the satellite frequency under the Rx Terminal Frequency menu
34.
Select 10 MHz Ref = ON
35.
Program LNB Voltage to the correct value (13, 18, or 24 VDC)
36.
LNB Voltage OFF.
37.
Connect LNB.
38.
Program LNB Power = ON
39.
Record the nominal ODU and LNB current after the units are warmed up and
functioning normally.
40.
Set the High alarm about 20% higher than nominal
41.
Set the Low alarm about 20% to 40% lower than nominal.
Selection / Programming
Selection / Programming
5–5
Revision 1
MN/DST.IOM
Menu Location
Configuration: Modulator
Function Select: Monitor
For CEFD BUCs, refer to
Chapter 3, Table 3-1
Configuration: Modulator
Utility: Modulator
For CEFD BUCs, refer to
Chapter 3, Table 3-1
Utility: Modulator
Configuration: Modulator
Configuration: Modulator
Configuration: Modulator
Configuration: Modulator
Configuration: Modulator
Configuration: Modulator
Function Select: Monitor
Utility: Modulator
Utility: Modulator
Menu Location
Utility: Demodulator
For CEFD LNBs, refer to
Chapter 4, Table 4-1
Utility: Demodulator
Configuration: Demodulator
Configuration: Demodulator
Configuration: Demodulator
Configuration: Demodulator
Function Select: Monitor
Utility: Demodulator
Utility: Demodulator
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