Installation Instructions

Table Of Contents
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9 NM 3561 Single antenna system adjustments - MKR
9.1 Mechanical alignment
9.1.1 Antenna mast
Utilise a waterlevel and align the mast vertically by adjustments of the base nuts.
9.2 Electrical measurements
9.2.1 Antenna return loss
Utilise a vector voltmeter or network analyser in a test set-up.
Measure return loss for the LPDA.
Measure the return loss value for the LPDA including antenna cable.
Tolerance: 22 dB minimum
.
Figure 9-1 Antenna return loss measurement set-up.
20dB
AB
VECTOR VOLTMETER
DIR. COUPL.
Antenna cable under test
Antenna
From Marker
Dir. coupler