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If the IF signals are incorrect, check the pulse generator bias voltages (see
n
pulse generator.
1. Connect the spectrum analyzer to the network analyzer A65, A sampler (53)
IF output.
2. Set the parameters on the spectrum analyzer:
center frequency = 10 MHz
span = 20 MHz
marker = 10 MHz
3. Press the following keys on the network analyzer to set the fractional-N
vco to 180 MHz: @EEE] @BXB% ~.~&X@&~. IsVsTEM $IB~Z$ZE $iEW
4. Slowly turn the network analyzer front panel knob until the spectrum
analyzer measures an output frequency of 10 MHz.
If the 10 MHz signal appeared, disregard the rest of this step and continue
with the next step.
If the 10 MHz signal didn't appear, connect the R sampler (53) to the
spectrum analyzer input and change the center frequency to 10 MHz.
If the 10 MHz signal appears on the R sampler but not on the A sampler,
n
the A sampler is faulty.
If the 10 MHz signal didn't appear at either the A sampler or the R
n
sampler, connect the network analyzer's PORT 1 to the spectrum
analyzer input.
Set the parameters on the spectrum analyzer:
center frequency = 0.9 GHz
span = 200 MHz
You should see a signal near the center frequency.
If a signal is present, the A52 pulse generator is probably faulty.
. . .
Source Troubleshooting 7-17
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Troubleshooting
