Measure return phase for the middle antenna cable (A2) and upper antenna cable (A3). Then
take into account the phase centres of the Antennas given in the factory data sheet. Deter-
mine if one of the cables should be trimmed in order to comply with phase equality tolerance
for the set of antennas.
Tolerance: ±1.0° true electrical cable length including Antenna phase centre deviation. (if
available)
See measurement set-up diagram Figure 8-1 below:
Figure 8-1 Cable phasing measurement set-up.
8.2.2
Monitor return cable length
Measure return phase as described in (72.0) for all three monitor cables. Check that initial
values are within ±1.5° true phase (±3.0° return phase).
8.2.3
Phase and amplitude transfer measurement
Connect each antenna cable and monitor cable to Antenna load and source respectively. Uti-
lise a vector voltmeter or network analyser in a test set-up Figure 8-2, and measure relative
transfer phase and amplitude for the middle and upper antenna cable (A2 & A3) in reference
to the lower antenna (A1)
.
Figure 8-2 Phase and amplitude transfer measurement set-up.
20dB
A
B
VECTOR
From cabinet
CSB BNC o/p
CABLE UNDER TEST
OPEN END
DIR. COUPL.
20dB
A
B
VECTOR VOLTMETER
A(n)
M(n)
From cabinet
CSB BNC o/p
Ant.
DIR. COUPL.
Summary of Contents for NM 7000 Series
Page 7: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 11: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 Figure 2 3 ...
Page 13: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 19: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 21: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 23: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 25: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 27: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 31: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 45: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 55: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 65: ... ...
Page 81: ... ...
Page 111: ... ...
Page 129: ... ...
Page 132: ... ...
Page 134: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 150: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...
Page 158: ...1250 5 167580 17 1 1 6 67 0 167 7 21 200 66 21 1 1 22 1DYLD YLDWLRQ 6 ...