SECTION 3
ANTENNA SYSTEMS ADJUSTMENTS PROCEDURE
Table of contents
1 NM 3522 6 elements antenna system adjustments - LLZ ..................................... 7
1.2.1 CSB and SBO cables .................................................................................. 7
1.2.2 CSB/SBO phasing ....................................................................................... 8
1.2.3 Antenna cable lengths (Electrical phase equality) ....................................... 8
1.2.4 Antenna pair phasing................................................................................... 8
1.2.5 Phase and amplitude transfer measurement ............................................... 10
1.2.6 Antenna return loss...................................................................................... 11
1.3.1 DDM check of ADU O/P (output port) .......................................................... 12
1.3.2 DDM field check........................................................................................... 13
Monitor combining unit (MCU) adjustments ....................................................... 13
2 NM 3523B 12 Elements antenna system adjustments - LLZ (Single frequency)15
2.2.1 CSB and SBO cables .................................................................................. 15
2.2.2 CSB/SBO phasing ....................................................................................... 16
2.2.3 Antenna cable lengths (Electrical phase equality) ....................................... 16
2.2.4 Antenna pair phasing................................................................................... 16
2.2.5 Phase and amplitude transfer measurement ............................................... 18
2.2.6 Antenna return loss...................................................................................... 18
2.3.1 DDM check of ADU O/P .............................................................................. 19
2.3.2 DDM field check........................................................................................... 20
Monitor combining unit (MCU) adjustments ....................................................... 21
Содержание NM 7000 Series
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