Spectrum Measurements
R&S
®
ESRP
421
User Manual 1175.7445.02 ─ 08
Signal generator settings (e.g. R&S SMW):
Frequency:
850 MHz
Level:
0 dBm
Modulation:
CDMA2000
Procedure:
1. Set the R&S
ESRP to its default state by pressing the [PRESET] key.
The R&S
ESRP is in its default state.
2. Press the [FREQ] key and enter "850 MHz" as the center frequency.
3. Press the [SPAN] key and enter "4 MHz".
4. Set the reference level to +10 dBm by pressing the [AMPT] key and enter "10
dBm".
5. Configure the adjacent channel power for the CDMA2000 standard (more pre-
cisely: CDMA2000 1X).
a) Press the [MEAS] key.
b) Press the "Ch Power ACLR" softkey.
c) Press the "CP/ACLR Standard" softkey.
d) In the standards list, mark
CDMA2000
.
The R&S
ESRP sets the channel configuration according to the 2000 standard with
2 adjacent channels above and 2 below the transmit channel. The spectrum is dis-
played in the upper part of the screen, the numeric values of the results and the
channel configuration in the lower part of the screen. The various channels are rep-
resented by vertical lines on the graph.
The frequency span, resolution bandwidth, video bandwidth and detector are
selected automatically to give correct results. To obtain stable results – especially
in the adjacent channels (30 kHz bandwidth) which are narrow in comparison with
the transmission channel bandwidth (1.23 MHz) – the RMS detector is used.
6. Set the optimal reference level and RF attenuation for the applied signal level by
pressing the "Adjust Ref Level" softkey.
7. Activate "Fast ACP" mode to increase the repeatability of results by pressing the
"Fast ACP" softkey (for details see below).
The R&S
ESRP sets the optimal RF attenuation and the reference level based on
the transmission channel power to obtain the maximum dynamic range. The
shows the result of the measurement.
Advanced Measurement Examples
