Comtech EF Data CST-5005 - Manual (Page 79)

CST-5005 C-Band Satellite Terminal Theory of Operation
Rev. 1 5–9
5.1.6 Test Points and LEDs
Refer to Section 6.1.
5.2 High Stability Oscillator
The high stability oscillator provides a low phase noise frequency-stable 10 MHz source
for the RF and IF local oscillator synthesizers.
The internal oven, which is provided for additional stability, operates directly from the
12V power source. The electronic control circuitry is buffered by an active filter.
Refer to Figure 5-4 for a block diagram of the High Stability Oscillator.
HIGH STABILITY OSCILLATOR
OSC
PWR FILTER
+12.5V
TUNING VOLTAGE
0 to 10V ELECTRONIC TUNING
OVEN
PWR
OUTPUT
5V
12V
REGULATOR
OVENIZED
HIGH STABILITY
OSCILLATOR
10 MHz
MECHANICAL
ADJUSTMENT
REFERENCE
Figure 5-4. High Stability Oscillator Block Diagram