Downlink Setup - Comtech EF Data KST-2000L Installation And Operation Manual

Satellite Terminal System
Operation
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6.
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8.
4.1.2

Downlink Setup

1.
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5.
Turn the RF output of the up converter ON. See appendix B.3 system configura-
tion commands. There should be no up converter faults at this time.
Using an appropriate frequency measuring device, ensure that the output of the
HPA (measured through the coupler or attenuator) is at the correct frequency.
Note: The internal, high-stability oscillators frequency can be fine tuned us-
ing the reference frequency adjust command. See Appendix B.3. Allow at
least 30 minutes warm-up before adjusting the oscillator.
Using an appropriate RF power measuring device, set the up converter attenua-
tion until the power measured at the output of the coupler or attenuator is at the
correct value. See Appendix B.3.
Turn the RF output of the up converter off. See Appendix B.3.
Apply a signal in the appropriate receive frequency range according to the fol-
lowing table at a known level (approximately –95 dBm) to the LNB input.
10.95 to 11.70 GHz
11.70 to 12.20 GHz
12.25 to 12.75 GHz
a. If the LNB is using power supplied by the KST-2000L, enable the LNB
power – see section B.5.
b. After a 10-minute warm-up, perform an LNB calibration, and enable LNB
faults if desired. See Appendix B.5.
Set the down converter to the desired RX operating frequency. See Appendix
B.3. There should not be any existing receive system faults. See Appendix B.9.
Using an appropriate power measuring device attached to the IF OUT connector
(J4), set the down converter attenuator until the desired downlink gain is at-
tained. See section B.3.
Note: At this point there should be no existing faults.
Execute a Clear Stored Faults command to clear the fault log (see Appendix
B.9), wait a few moments, and execute a System Fault Status command to ver-
ify.
Remove the AC power from the unit, remove the 70 MHz (140 MHz) test
source, remove the RX signal source, and remove the coupler/attenuator from
the HPA.
4–3
Revision 2
MN/KST2000L.IOM