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The amplified and filtrated control voltage is called VREG and looks like the figure below
Fig. 10.2
The actual up- and down- ramping are much shorter then other parts of the control voltage.
Therefore is it only the up- and down-ramping in the figure that is timely proportional to each
other. The proportion for the amplitude is correct at Power level 5,for GSM 900 and Power level
0,for GSM 1800.
The Zero Power level is a voltage level from the DAC that assures no output power at all.
The Offset level is the highest possible voltage before the power amplifier starts to transmit.
The Offset voltage compensates for the differences of voltage fault between different power
amplifiers and is produced in N450.
The tables below Table10.1. and Table.10.2. show the limits for maximum power levels at
transient disturbances.
Parameter
Fc +400 kHz
Fc -400 kHz
Parameter
Fc +400 kHz
Fc -400 kHz
"Measure Transient Spectra" is a part of the radio calibration in EFRA. It is performed after the
power calibration and measures the power levels at the middle channel frequency, ± 400 kHz, of
the transmitter. The power level must not be higher then –19 dBm for GSM 900 and –22 dBm
for GSM 1800.
4/00021-3/FEA 209 544/18 B
Fig.10.2
GSM 900
Min.
Normal
-
-23
-
-23
Table.10.1
GSM 1800
Min.
Normal
-
-25
-
-25
Table.10.2
Trouble Shooting Guide, Advanced
Max
Units
-19
dBm
-19
dBm
Max
Unit
-22
dBm
-22
dBm
44(121)
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