Chapter 2 19
Setting Up the EDGE (with GSM) Mode
Changing the Mode Setup
Input
The Input key accesses a menu to select the following. (You can also
access this menu from the front-panel key
Input.)
•
Input Port - Choose between RF, I/Q, I Only, 50 MHz Ref, and IF Align.
•
RF Input Range - To set the RF input range, choose Auto or Manual. If
Auto is chosen, the instrument automatically sets the attenuator
based on the power level of the carrier (where the instrument is
tuned). If there are multiple carriers present, the total power might
overdrive the front end. In this case you need to set the
RF Input
Range to Manual and enter the expected Max Total Pwr. Manual is also
used if you want to hold the input attenuation constant (for the best
relative power accuracy). For single carriers it is generally
recommended to set the
RF Input Range to Auto.
•
Max Total Pwr - To set the maximum total power at the UUT (Unit
Under Test). This is the maximum expected value of the mean
carrier power referenced to the output of the UUT (may include
multiple carriers). The
Max Total Pwr setting is coupled to the Input
Atten setting. If RF Input Range is set to Auto, and Max Total Pwr is
changed,
RF Input Range is switched to Manual.
•
Input Atten - To set the input attenuator setting. The Input Atten
setting is coupled to the Max Total Pwr setting. The Input Atten key
reads out the actual hardware value that will be used for the current
measurement. If more than one input attenuator value is used in a
single measurement, the value used at the carrier frequency will be
displayed. If
RF Input Range is set to Auto, and Input Atten is changed,
RF Input Range is switched to Manual.
NOTE The Max Total Pwr and Input Atten settings are coupled together. When
you switch to a different measurement, the
Max Total Pwr is kept
constant, but the
Input Atten may change if the two measurements have
different mixer margins. Thus, you can directly set the transmitter
tester input attenuation, or you can set it indirectly by specifying the
maximum expected power at the UUT (Max Total Pwr setting).
•
Ext Atten - To enter the external attenuator setting for either a BTS
or MS. This will allow the instrument to display the measurement
results referred to the output of the UUT (Unit Under Test).
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