Nokia RM-94 Service Software And Tuning Instructions page 61

RM-94
3 - Service Software and Tuning Instructions
Use the variables 'TX I DC offset' and 'TX Q DC offset' to adjust the carrier signal to a minimum
level (marker 2). Tuning can be performed by using arrow keys on the keyboard. Pushing the
sliders by using the mouse is less sensitive however possible.
After tuning to the minimum the level difference between marker 2 and the peak levels at mark-
er 1 must exceed 40dB.
The spectrum analyzer now shows a plot like this:
Ref Lvl Ref Lvl
35 dBm 35 dBm
35
21 dB Offset
30
20
10
0
-10
-20
-30
-40
-50
-60
-65
Center 897.4 MHz
Use the variables 'Amplitude difference' and 'Phase difference' to adjust the +67kHz signal to
a minimum level (Marker 3). Tuning can be performed by using the arrow keys on the keyboard.
Pushing the sliders by using the mouse is less sensitive however possible.
After tuning to the minimum, the level difference between marker 3 and the peak level at marker
1 must exceed 40dB.
Issue 1 04/2005
Marker 1 [T1]
25.82 dBm
897.33229000 MHz
1
30 kHz/
COMPANY CONFIDENTIAL
Copyright © 2005 Nokia. All Rights Reserved.
RBW 3 kHz RF Att
VBW 3 kHz Mixer
SWT 3 s Unit
1 [T1]
897.33229000 MHz
2 [T1]
897.40000000 MHz
3 [T1]
897.46771000 MHz
3
2
Nokia Customer Care
30 dB
-20 dBm
dBm
25.82 dBm
A
LN
-21.06 dBm
-11.52 dBm
1MA
F2
F1
Span 300 kHz
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