Agilent Technologies E4428C, Руководство пользователя

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358 Chapter 11
GPS Modulation
Real Time GPS
Figure 11-6 Real Time GPS Setup with Internal Clock
Configuring the External Reference Clock
1. Access the real-time GPS personality (
Mode
>
More(1 of 2)
>
GPS
>
Real Time GPS
).
2. Press
More (1 of 2)
>
GPS Ref Clk Ext Int
to Ext.
3. Press
GPS Ref (f0)
>
11.03
>
kcps.
4. Connect the external reference clock source to the DATA CLOCK INPUT connector.
The maximum clock rate for this input connector is 50 MHz with a voltage range of
−
0.5 to 5.5 V.
5. Set the external reference clock source to the chip rate value entered in Step 3 .
The maximum data rate for this input connector is 50 Mb/s with a voltage range of
−
0.5 to 5.5 V.
NOTE
The chip rate of the external source must match the chip rate value set using the
GPS Ref (f0)
softkey.
Figure 11-7 on page 359 shows what the signal generator display should look like after all the steps have
been completed. The
CA Chip Rate
,
P Chip Rate
,
GPS Ref (f0)
, and
GPS Ref Clk
fields in the
status area of the display show the new parameters you set in this procedure. Notice the settings
Satellite
ID
,
Doppler Shift
,
Data
, and
Data Mode
, have not changed from the previous procedure, “Setting Up
the Real Time GPS Signal” on page 357 .