RF: Connection Control CMU
1100.4903.12 4.64 E-10
Modulation
Filter
Modulation Filter defines the resolution bandwidth of the modulation filter. The
bandwidths 30 kHz, 300 kHz or Off (corresponding to a broadband modulation
filter) can be selected.
In a Spectrum measurement a modulation filter suppresses the signals located to
the right and to the left of the center frequency.
Remote control
SOURce:RFGenerator:BANDwidth[:RESolution] <Bandwidth>
The following settings are provided separately for the Tx and for the Aux Tx signal.
Level
Level defines the total level of the generated RF signals in dBm. The value range
depends on the selected RF output (RF 1, RF 2 or RF 3 OUT).
External attenua-
tion
If an external gain or attenuation is used and reported to the instrument (see soft-
key Ext. Att. Output in the menu RF
on page 4.65) the RF generator level is
adjusted to maintain the commanded power after the attenuation or gain. As a con-
sequence, all levels indicated are referenced to the input of the DUT and no longer
correspond to the actual level at the output connectors of the CMU. The default
value for the generator power is also shifted provided that the generator can output
the required power, compensating for the external attenuation or gain. Otherwise it
is adapted to the level closest to the shifted default value.
Error messages If the entered generator level is too high or too low, a window with the error mes-
sage "<Max_Level> is out of range. <permissible max. value> is limit." and three
fields will appear:
Accept The permissible max. value is accepted as RF Level,
Re-edit RF Level is entered once again,
Cancel The last valid input value is maintained.
When switching over to another output, the current value of RF Level is automati-
cally adapted, if required:
• Towards lower values to the maximum permissible value of the new output,
• Towards upper values to the minimum value of the new output.
Remote control
SOURce:RFGenerator:LEVel <Level>
SOURce:RFGenerator:AUXTx:LEVel <Level>
Frequency
Frequency defines the frequency of the generated RF signals.
Remote control
SOURCe:RFGenerator:FREQuency <Frequency>
SOURCe:RFGenerator:AUXTx:FREQuency <Frequency>
The following settings are provided for the Tx signal only.
Frequency
Hopping
Frequency Hopping defines whether Tx is a signal with a single, constant basic
frequency (frequency hopping Off) or a signal with two alternating frequencies (fre-
quency hopping On) .
The basic frequency is the Frequency set in the RF Analyzer/Generator menu. The
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