Comtech EF Data KST-12025 - Manual (Page 96)

Theory of Operation KST-12025 Ku-Band Satellite Terminal
5–10 Rev. 1
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 up converter, down converter, and IFLO synthesizers.
The oven, which is provided for additional stability, operates directly from the 12V
power source. The electronic control circuitry is buffered by an active filter.
The sinewave output is converted to a CMOS square wave before cabling to the
synthesizers.
Refer to Figure 5-4 for a block diagram of the high stability oscillator.
5.2.1 Specifications
Frequency 10 MHz
Frequency Stability ± 1 x 10 -8 , -40 to +70
°
C
Output Level CMOS voltages (+5V)
Output Waveform Square Wave
Input Voltage 12.5V
Input Current 550 mA at turn-on, 300 mA after warm-up at +25
°
C
Warm-up 2.5 minutes to within 1 x 10 -7 of final frequency at +25
°
C
Phase Noise (Maximum); 1Hz
Measurement bandwidth measured
at 10 MHz
10 Hz
100 Hz
1 kHz
10 kHz -120 dBc
-150 dBc
-160 dBc
-165 dBc
Vibrational sensitivity 1 x 10 -9 /g
Aging 5 x 10 -10 /day, 1 x 10 -7 /year
Frequency Deviation (mechanical) To compensate for 10 years of aging
Frequency Deviation (electrical) ± 2 x 10 -6 minimum, 0 to 10 VDC