Comtech-ef-data DST Bedienungsanleitung PDF herunterladen (Seite 57)

Digital Satellite Terminal System Revision 1

Operation MN/DST.IOM

5–5

TX Side Setup:

Step

No.

Selection / Programming

Menu Location

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.

Configuration: Modulator

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%)

Function Select: Monitor

For CEFD BUCs, refer to

Chapter 3, Table 3-1

17. To protect the equipment, select the ODU Power = OFF. This is necessary

before connecting the L-Band coaxial cables to the unit

Configuration: Modulator

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

Utility: Modulator

For CEFD BUCs, refer to

Chapter 3, Table 3-1

19. Set Mod Spectrum to Normal or Invert. Utility: Modulator

20. Program the satellite frequency under the TX Terminal Frequency menu Configuration: Modulator

21. Set the TX Power Level to a safe (low) value Configuration: Modulator

22. Turn TX carrier to Off. Configuration: Modulator

23. Connect BUC.

24. Turn TX reference to On. Configuration: Modulator

25. Turn TX ODU power to On. Configuration: Modulator

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.

Configuration: Modulator

27. Record the nominal BUC current after the unit is warmed up and

functioning normally.

Function Select: Monitor

28. Set the High alarm about 20% higher than nominal Utility: Modulator

29. Set the Low alarm about 20% to 40% lower for the ODU (BUC). Utility: Modulator

IMPORTANT

At this point, the unit will start transmitting when the TX-IF output is tuned On

(under Configuration: Modulator menu).

5.4 Initial Operation of the Modem with the ODU and LNB

RX Side Setup:

Step

No.

Selection / Programming

Menu Location

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

Utility: Demodulator

For CEFD LNBs, refer to

Chapter 4, Table 4-1

32. Set Demod Spectrum to Normal or Invert. Utility: Demodulator

33. Program the satellite frequency under the Rx Terminal Frequency menu Configuration: Demodulator

34. Select 10 MHz Ref = ON Configuration: Demodulator

35. Program LNB Voltage to the correct value (13, 18, or 24 VDC) Configuration: Demodulator

36. LNB Voltage OFF.

37. Connect LNB.

38. Program LNB Power = ON Configuration: Demodulator

39. Record the nominal ODU and LNB current after the units are warmed up and

functioning normally.

Function Select: Monitor

40. Set the High alarm about 20% higher than nominal Utility: Demodulator

41. Set the Low alarm about 20% to 40% lower than nominal. Utility: Demodulator

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