150 Chapter 6
L.O. Synthesizer/Reference Troubleshooting
A9 L.O. Assembly Troubleshooting
Verifying the Reference Signal
Verify the reference signals, local oscillator output frequencies, and power levels
as per Table 6-2 using a functioning spectrum analyzer. In order to measure the
signals, remove the rear panel. Refer to “Rear Panel” removal procedure on section
on page 249 for details. If these outputs measure incorrectly, the L.O. Assembly is
the most probable cause provided the power supply is operating correctly. Refer to
“Power Supply/Midplane Troubleshooting” on page 165 if the power supplies are
suspect.
Figure 6-2 A16 Reference Assembly Layout
J744
J748
J746
J753
J751
J747
DS1
DS2
DS3
Table 6-2 Connector Details
Signal
Description
Signal
Location
Expected
Frequency
(MHz)
Expected Power
Level
(dBm)
Special Instrument
Conditions
50 MHz Cal Out J748
50 MHz
–25 dBm Input/Output, RF
Calibrator, 50 MHz
300 MHz 3
rd
L.O.
Out
J746 300 MHz +10 dBm
100 MHz Reference
Out for 2
nd
L.O.
J753 100 MHz +8 dBm
10 MHz Reference
Out to DIF
J751 10 MHz +5 dBm
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