5a-9
Theory of Operation
A4 Reference
A4 Reference
The reference assembly accepts either an external 10 MHz reference signal to lock the
internal 10 MHz TCXO (temperature-compensated crystal oscillator) or uses an optional
high stability 10 MHz OCXO (oven-controlled crystal oscillator). The reference assembly
outputs two 200 kHz signals, a 1 GHz signal, and a 10 MHz signal which is routed to the
rear panel.
One of the two 200 kHz signals is routed to the A5 synthesizer and the other to the A3
modulation section. The 1 GHz signal is routed to the A6 output assembly.
The 10 MHz REF OUTPUT rear panel signal is a buffered output from the 10 MHz TCXO
or OCXO.
The 200 kHz signals are derived by dividing the 10 MHz signal by 50. The 1 GHz signal is
derived from a 1 GHz VCO that is phase-locked to the 10 MHz signal.
The reference assembly contains a calibration ROM that contains factory-generated
calibration data that is specific to the assembly.
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