Technical Specification R&S CMU-B17
1100.4903.12 TI.14 E-3
IF Outputs, RX Path
(Connector IF3 RX CH1 OUT)
IF level range up to +4 dBm, PEP
Standard IF frequencies RF/GSM/IS136/AMPS/IS95/CDMA2000
WCDMA
10.7 MHz
7.68 MHz
Aspects to be considered, if TX or RX signal paths are interrupted *:
The RF frequency of the R&S CMU influences the rotating direction of the IQ vector.
The direction is inverted for RF < 1200.1 MHz, this can be compensated by changing I and Q
R&S CMU generator or analyzer RF frequency
100 kHz.. 1200.0999999 MHz 1200.1.. 2700.0 MHz
R&S CMU IQ output vector
Inverted rotation.
Swap I-output with Q-output for
proper operation
Normal rotation
R&S CMU IQ input vector
Inverted rotation.
Swap I-input with Q-input for
proper operation
Normal rotation
*) Please refer to Annex 1. The rotating direction must be considered, if the R&S CMU signal path
from Link Handler Board to Frontend and vice versa is interrupted; i.e. if the signal is not returned to
the same R&S CMU block after external treatment. Examples:
• The rotating direction must not be taken into account, if the transmitted signal is routed from IQ
output of R&S CMU-B17 to an external fading simulator and than returned to IQ input of CMU (pls.
refer to chapter Applications, R&S CMU in combination with fading simulator R&S ABFS or R&S
SMIQ/SMIQB14, R&S CMU provides the faded RF signal).
• The rotating direction must be considered, if the transmitted signal is forwarded to an external fading
simulator and is not returned to IQ input of R&S CMU (pls. refer to chapter Applications, R&S CMU
in combination with R&S SMIQ, R&S SMIQ provides the faded RF signal).
Notes for measuring IQ / IF signals, applied to inputs of option R&S CMU-B17
on R&S CMU RX path:
• The RF spectrum analyzer function (RF Function Group) is not applicable.
• The displayed RF power levels are not directly related to applied IQ / IF voltages. The analyzer
settings of R&S CMU RF interface (RF1, RF2, RF 4 IN) have to be considered additionally (softkeys
Analyzer Level / RF Max. Level).
• IQ inputs have a fixed attenuation of 2 dB; e.g. the RF power meter readout for an applied 500
mV IQ peak voltage will be 2 dB below the set RF Max. Level value.
• IF inputs do not have a fixed attenuation. The max. IF input level is 2 dBm. The RF power meter
readout for the mentioned max. IF signal level (2 dBm) will be 2 dB below the set RF Max. Level
value.
• It is recommended to switch off the Autoranging Function.
• RF and IF trigger functions are not possible.
• WCDMA RF Compensation filter is switched off (I/Q IN/OUT, IF IN/OUT, IFIN_I/Q IN/OUT)
• WCDMA UE-Test: ACLR/SEM measurement is not applicable
To Next Page
Loading...
Need help?
General
