SAF Spectrum Compact, Пошаговое руководство

Страница: 28 / 54

23
value used. Tap ENTER, then HOME.
6. Tap FREQUENCY, then CENTRE and using the keypad select the frequency
equal to the centre frequency set on the transmitter (in MHz). Tap ENTER,
then HOME.
7. Tap SPAN, then MIN SPAN. Tap HOME.
Note: for wider radio channel bandwidths (80 MHz and up), tap SPAN and using
the keypad select a wider span e.g. 120. Tap ENTER. Tap HOME.
8. On Spectrum Compact tap TRACE MODE, then MAXHOLD. Tap HOME.
If the calculated target received signal strength is below -80 dBm, zoom in on
the power axis for better visualization: tap TOOLS, tap LEVEL, then MAX and
using the keypad select e.g. -70. Tap ENTER, then HOME.
9. Tap SWEEP CONT (if the button is grey).
10. Before making any adjustments, mark the current position of the feeder.
11. Loosen the screws enough to allow movement of the feeder.
12. Adjust the feeder clockwise or anti-clockwise, while simultaneously
comparing the two traces shown on the screen of Spectrum Compact.
13. Carefully tighten and fix the feeder or OMT in position when the NORMAL
trace matches the blue MAXHOLD trace i.e. when the currently received
signal level is the highest possible.
Note: This adjustment is necessary to make only at the one end of the link.