Comtech EF Data CST-5000 - Manual (Page 101)

Theory of Operation CST-5000 C-Band Satellite Terminal
5–12 Rev. 9
5.3 IF Local Oscillator
The IF local oscillator (IFLO) contains:
• Voltage Controlled Oscillator (VCO)
• Loop filter
• Divide-down chain
The 10 MHz input reference is multiplied up to 2120 MHz in three steps (2 x 2 x 53),
then distributed to both synthesizers.
The 10 MHz output reference is multiplied by 106, and is sent to both the up and down
converters.
The loop tracking voltage is sent to the M&C board, where it is monitored along with the
lock detect fault.
Refer to Figure 5-5 for a block diagram of the IFLO.
5.3.1 Specifications
Input 10 MHz square wave, CMOS levels
Output 1060 MHz (2 each), 2120 MHz (2 each)
Connectors SMA
Output Impedance
50 Ω
Output Level +7 dBm min.