Comtech EF Data CST-5005 - Manual (Page 81)

CST-5005 C-Band Satellite Terminal Theory of Operation
Rev. 1 5–11
5.3 IF Local Oscillator
The IF local oscillator (IF LO) contains:
•
Voltage Controlled Oscillator (VCO)
•
Loop filter
•
Divide-down chain
The lock detect status is sent to the M&C board, where it is monitored.
Refer to Figure 5-5 for a block diagram of the IF Local oscillator.
IF LOCAL OSCILLATOR
10 MHz REFERENCE
U/C
D/C
1112.5 MHz
SMA FEMALE
+13 dBm
1112.5 MHz
SMA FEMALE
+13 dBm
LOOP
FILTER
PHASE
DETECT
VCO
DIVIDE
DOWN
CHAIN
Figure 5-5. IF Local Oscillator Block Diagram
5.3.1 Specifications
Input 10 MHz Square wave, CMOS levels
Output 1112.5 MHz (2 each)
Connectors SMA
Output Impedance 50 Ω
Output Level +13 dBm