Rohde & Schwarz CMU-K20, Operating Manual

Page: 154 / 646

Non Signalling: Connection Control CMU-K20/K21/K22/K23/K24
1115.6088.12 4.76 E-11
•
The generator frequency (RF Channel, Frequency Offset)
•
A Training Sequence and a Bit Modulation sequence to be modulated onto the generated RF signal
•
The Transmission mode (continuous or burst signal)
Fig. 4-35 Connection Control – Generator (softkey)
Generator
The Generator softkey defines the generator level and indicates the operating
status of the RF generator (ON or OFF) . Pressing the Generator softkey and the
ON/OFF key switches the generator on or off.
For the generator level, a distinction is made between the used timeslot (selected
and used for later measurements) and the remaining, unused timeslots. This
feature is useful for many tests specified for GSM mobile phones. E.g. the adjacent
time slot level is set to a higher value than the used time slot level in order to test
whether the mobile receiver can quickly adapt to fast level changes.
Remote control
INITiate:RFGenerator
ABORt:RFGenerator
FETCh:RFGenerator:STATus?
Used The level is indicated as absolute value (in dBm).
Remote control
SOURce:RFGenerator:LEVel:UTIMeslot <Level>
Unused The level is defined relative to the level in the used timeslot (in dB). The absolute
level in the unused timeslots, i.e. the sum of numerical values set under used and
unused must lie within the permissible range for the RF outputs. This condition
further restricts the permissible level for the unused timeslots.
External output
attenuation If an external output attenuation or gain is known and reported to the instrument
(see softkey
Ext. Att. Output) the RF generator level is adjusted to maintain the
commanded power after the attenuation or gain. As a consequence, all levels
indicated are referred to the input of the DUT and no longer correspond to the
actual level at the output connectors of the CMU (see section
AF/RF Connectors
(Connection Control – AF/RF) on page 4.80 ). The default value for the generator
power is also shifted provided that the generator can output the required power,
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