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II
Synthesizer Section
The synthesizer section includes the A7 switched first LO distribution amplifier, the All
YTO, and parts of the Al4 frequency control and Al5 RF assemblies. Simplified and detailed
block diagrams for each assembly are located at the end of this chapter.
Troubleshooting Using the TAM
Troubleshooting Test Setup
Confirming a Faulty Synthesizer Section
General PLL Troubleshooting
PLL Locked at Wrong Frequency
Unlocked PLL
Unlocked Reference PLL (100 MHz VCXO)
Operation (100 MHz VCXO)
Troubleshooting (100 MHz VCXO)
Third LO Driver Amplifier (100 MHz VCXO)
Unlocked Reference PLL (600 MHz SAWR)
Operation (600 MHz SAWR)
Troubleshooting (600 MHz SAWR)
Third LO Driver Amplifier (600 MHz SAWR)
Unlocked Offset Lock Loop (Sampling Oscillator)
Operation
Troubleshooting
Unlocked YTO PLL
Operation
Troubleshooting an Unlocked YTO PLL
Unlocked Fractional N PLL
Operation
Confirming an Unlocked Condition
Fractional N PLL
Frequency Span Accuracy Problems
Determining the First LO Span
Confirming Span Problems
YTO Main Coil Span Problems (LO Spans
>20
MHz)
YTO FM Coil Span Problems (LO Spans 2.01 MHz to 20 MHz)
Fractional N Span Problems (LO Spans
12
MHz)
First LO Span Problems (All Spans)
First LO Span Problems (Multiband Sweeps)
Synthesizer Section 1
l-1