Norsat International Inc. NSLK3200 ユーザーズマニュアル
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20. In the
R
ESOLUTION
B
ANDWIDTH
panel, the span of the filter is being set; i.e.
the number of samples. Select:
i.
3.05
K
H
Z
: for a detailed, but slower display.
ii.
97.65
K
H
Z
: for a fast, but less detailed display.
21. The
S
TATUS
panel displays the frequency (GHz) and amplitude (dB) for the
two markers on the graph, and for the difference between the two mark-
ers. The markers can be placed at a particular point on the graph by:
ers. The markers can be placed at a particular point on the graph by:
i.
Using the left and right arrows for each marker.
ii.
Clicking, or clicking and dragging, the left mouse button to move
marker 1; right mouse button for marker 2.
marker 1; right mouse button for marker 2.
N
OTE
The amplitude is relative.
22. If pointing is very inaccurate, signal peaking may be required before a
clear signature or beacon is seen.
i.
Slowly sweep the azimuth to peak the signal.
ii.
Tighten the azimuth hand wheels/levers.
iii. Slowly sweep the elevation to peak the signal by turning the quick
adjust collars on the elevation jack screw.
iv. Tighten the quick adjust screws to lock the elevation position.
v.
v.
Verify that the antenna is pointed at the correct satellite by checking
the spectral signature or known beacon frequencies.
the spectral signature or known beacon frequencies.
vi. Polarization is best peaked by maximizing a cross-pol signal. Attempt
to find a cross-pol signal in an area without a carrier present: deter-
mine a clear area and zoom in on this area with the Spectrum Ana-
lyzer.
mine a clear area and zoom in on this area with the Spectrum Ana-
lyzer.
vii. Set the center frequency of the Signal Strength meter to the center of
this clear area, and note the signal strength reading.
viii. Slowly sweep the polarization in one direction until the signal strength
reading rises.
ix. Verify on the Spectrum Analyzer that the signal level rises; ideally 10
dB. Note this polarization setting and signal strength reading.
x.
Sweep the polarization back through the starting point until the signal
strength reading is the same as the reading noted in step ix. The sig-
nal on the Spectrum Analyzer should also be the same as in step ix.
Note this polarization setting.
strength reading is the same as the reading noted in step ix. The sig-
nal on the Spectrum Analyzer should also be the same as in step ix.
Note this polarization setting.
xi. Calculate the mid-point of the two extremes and set the polarization
setting to this value.
xii. Tighten the thumb screw.
N
OTE
It may take several attempts to find a suitable cross-pol signal; note the cross-
pol signal frequency for future use. If a cross-pol signal cannot be found,
attempt to maximize the signal by slowly rotating the feedhorn and watching
the Signal Strength meter and/or the Spectrum Analyzer.
pol signal frequency for future use. If a cross-pol signal cannot be found,
attempt to maximize the signal by slowly rotating the feedhorn and watching
the Signal Strength meter and/or the Spectrum Analyzer.
The antenna is now aligned with the satellite, and the satellite access process
can begin.
can begin.
23. In the DVB Carrier Search sub-panel, functionality is provided to verify
that the antenna is locked on to the correct satellite.
i.
H
OLDING
: indicates the satellite that the antenna is locked on to, if it is
indeed locked.
ii.
S
IGNAL
Q
UALITY
: indicates the strength of the signal. This bar is green
if the signal quality is good, yellow if the signal quality is poor.