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3.
Press the Center Frequency soft key.
4.
Enter a value by using the numeric keys. You can also use the rotary knob.
5.
Select the unit: GHz, MHz, kHz, or Hz.
6.
Optional. To define the amount of frequency increment for the rotary knob, complete the following
steps:
a.
Press the Frequency Step soft key.
b.
Enter a value by using the numeric keys. You can also use the rotary knob.
c.
Press the unit: GHz, MHz, kHz, or Hz.
To set the channel number:
1.
Press the FREQ/DIST hard key.
2.
Toggle the Unit soft key and select Channel.
3.
To select the standard channel, complete the following steps:
a.
Press the Channel Std soft key. The standard channel window appears.
See "Appendix C – Band, frequency & channel standard"" on page 571 for more
information.
b.
Select the band to be measured by using the rotary knob, the arrow keys, or the Page
Up/Page Down soft keys.
c.
Press the Select soft key or the rotary knob to confirm the selection.
4.
Press the Channel Number soft key.
5.
Enter a value by using the numeric keys. You can also use the rotary knob.
6.
Press the Enter soft key.
The instrument automatically displays the corresponding center frequency value for the selected
channel number.
7.
Optional. To define the amount of channel increment for the rotary knob, complete the following
steps:
a.
Press the Channel Step soft key.
b.
Enter a value by using the numeric keys. You can also use the rotary knob.
c.
Press the Enter soft key.
NOTE
This frequency setting is not used in the Multi-ACLR and Spurious Emissions modes.
Setting amplitude
Reference level and attenuation
You can set the reference and attenuation levels automatically or manually to optimize the display of
the traces measured, as you desire.
Procedure
To automatically set the reference and attenuation level:
1.
Press the AMP/SCALE hard key.
2.
Press the Auto Scale soft key.
Each time you press this key, both of the Y-axis scale and input attenuation level change to be
optimized with some margin.
To set the reference or attenuation level manually:
Using CDMA Signal Analyzer
JD780A Series Analyzers
335
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