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Making Measurements
Advanced Features
• SMS Cell Broadcast - the SMS CB screen allows you to test whether the mobile
phone is capable of correctly receiving and displaying a message sent from a base
station using the Short Message Service (SMS) Cell Broadcast protocol. This
screen can be accessed by highlighting the More field in any main screen and
selecting SMS CB.
Using RF Rise
Triggering
When using RF Rise triggering of measurements, the Trigger Delay should be
adjusted so that the wanted data is captured during the sampling process. The actual
measurement is made at the Trigger Delay time after the RF Rise. When changing
from RF Rise triggering to another trigger mode, the Trigger Delay should be
adjusted to the appropriate value as the default Trigger Delay is not automatically
restored.
Example: In the Agilent 8922M/S, when using the RF Rise, a Trig-
ger Delay of 0 is recommended. When changing from RF
Rise to Ext Demod trigger mode, the default value of
473.4T should be re-entered for Trigger Delay.
The value 473.4T is derived from the 468.75 bits of delay
between downlink and uplink plus the 4.7 bits of modula-
tion delay inside the Agilent 8922M/S. All timing is refer-
enced to the beginning of bit zero on the downlink TCH
timeslot, (DCH or BCCH timeslot if TCH is not active.)
Effect of the RF
Generator on RF
Analyzer
Measurements
When the RF Generator is set to a high level relative to the analyzer RF input, some
error may be introduced in the analyzer’s power detector. This is due to the isolation
limits between generator and analyzer on the RF IN/OUT port. This only occurs
when the RF Generator and RF Analyzer share the RF IN/OUT port. If the
RF Generator uses the AUX RF OUT port, no error occurs.
RFin is the amplitude in dBm of the signal into the RF IN/OUT port. Normally the
setting in dBm of the RF Analyzer Amplitude. RFgen is the setting in dBm of the
RF Generator.
Because the two components are not always in phase, the actual error will often be
slightly less.
Error 10LOG 10
RFin 20–
10
--------------------------
10
RFgen 14+
10
-------------------------------
+
RFin 20–()– dBm=