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Testing of Transmitter
Step 3: Spectrum Analyzer Setup and Clock Offset Procedure
Set-up the spectrum analyzer to observe the following:
Figure 3–7. Spectrum Analyzer
Clock Offset Procedure
1) Use the test setup of Figure 3–4 and transmitter software setup as shown
2) Observe the frequency reading on the frequency counter.
3) Subtract 915.000000 MHz from the frequency counter reading.
4) Enter the difference value in the Freq. Error box in the main program
5) If difference value is negative, enter – sign, followed by the difference
6) Press the Update CLK button on the main program screen.
7) Observe that clock frequency is updated as shown in Figure 3–9.
8) Pressing the Update CLK button twice will cause the frequency offset to
in Figure 3–5.
screen as shown in Figure 3–8.
value
Example: Frequency Counter reading is 914.996000 MHz.
Subtracting 915.000 MHz from 914.996 MHz will yield a difference
of –4000 Hz. This difference is entered in the Freq. Error block as
–0.004 MHz (see Figure 3–8).
be cleared.
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