SAF Spectrum Compact, Пошаговое руководство

Страница: 30 / 54

25
11. Tap SWEEP CONT (if the button is grey).
12. If the initial rough antenna alignment was done correctly and the LoS
between the two antennas is clear, signal trace should appear at the
centre of the graph now.
13. Start with the horizontal adjustments.
14. Loosen the antenna to do the adjustments.
15. By slowly turning the antenna, sweep all the way through.
In addition to a prominent main lobe, antenna radiation patterns also have
smaller side lobes. The most common mistake during alignment is aligning to
a side lobe. Thus, it is important to sweep all the way through before fixing the
antenna position.
16. Now sweep the range once more, while simultaneously comparing the
two traces shown on the screen of Spectrum Compact.
17. Fix the position when the NORMAL trace matches the blue MAXHOLD
trace i.e. when the currently received signal level is the highest possible.
When the horizontal fine alignment is completed, align the antenna vertically
in the same manner ( steps 14-17 ).
18. Tap TRACE MODE, then either AVERAGE 2 or AVERAGE 4. Tap HOME.
19. Tap POWER IN BAND, then BW and using the keypad select the bandwidth
equal to the channel width set on the radio. Tap ENTER. Tap SET TO
CENTRE. Tap HOME.
20. Tap SWEEP CONT (if the button is grey).
21. If the transmitter is working and the LoS between the two sites is clear,
signal trace should appear at the centre of the graph now.
22. Compare the value shown in the upper left corner of the screen with