ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
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Confidential and Proprietary Information of ZTE CORPORATION
vii.
MARKER DELTA in SOFT KEY LABELS (3) and SOFTKEYS can be
used to read the difference between two PEAKs. And one MARKER
should stay in PEAK, the other MARKER can be moved by KNOB,
and then the frequency and level DELTA difference between two
MARKERs can be read by the spectrum analyzer on-line.
viii.
The functions related to TRACE in the CONTROL (8) area can be
used to measure the unstable RF signals:
Set the MAX signal as HOLD IN TRACE A;
Set the MIN UNSTABLE RF signal as HOLD IN TRACE C;
Observe the real-time UNSTABLE RF signal from TRACE B.
The transmission paths of the unstable RF signal are shown in
Figure 103.
F
I G U R E
1 0 3
T
R A N S M I S S I O N
P
A T H O F
R F
S
I G N A L
TRACE A
TRACE B
TRACE C
ix.
For two signals with near frequencies and AMPLITUDEs, set the
judgment bandwidth RES BW of the spectrum analyzer to less than
or equal to 3dB bandwidth of the signal, to separate these two
signals, as shown in Figure 104.
