Verifying The 4800 Mhz 1St Lo Reference Power And Frequency Stability - Keysight Technologies Option 503 Service Manual

LO Synthesizer/Reference Troubleshooting
A14 LO Synthesizer and A20 YTO Troubleshooting
Verifying the 4800 MHz 1st LO Reference Power and Frequency
Stability:
1. Turn on the N9030A Signal Analyzer and wait for the instrument to
2. Press FREQ, 50 MHz, SPAN, Zero Span, Meas Setup, PhNoise Opt, Best
3. Disconnect W31 from A14J4 (see
DS3 (red LED) will blink between sweeps when cable W31 is removed. This
is normal
Figure 8-2 Cable and LED Locations
4. Connect the end of W31 to the RF input of the functioning spectrum
5. Set the functioning spectrum analyzer to a center frequency of 4800 MHz
6. Press Peak Search on the functioning spectrum analyzer. The analyzer
256
complete the boot up process.
Close in PNoise. If Phase Noise Optimization is not set to either Best Close
in PNoise or Best Wide Offset PNoise, the 4800 MHz 1st LO Reference
signal will be approximately 20 dB lower than required for proper
dual-loop operation.
analyzer.
and a span of 5 MHz. Set the reference level to +10 dBm.
marker should read 4800 MHz at +3 dBm ± 3 dB as shown in
Figure 8-2).
N9030A PXA Signal Analyzer Service Guide
Figure 8-3.