Comtech EF Data CST-5000 - Manual (Page 105)

Theory of Operation CST-5000 C-Band Satellite Terminal
5–16 Rev. 9
5.5 Down Converter
The function of the down converter is to convert the C-Band signal from the LNA to a
70 MHz IF signal for use in the modem.
Refer to Figure 5-8 for a functional block diagram of the down converter.
3620 TO 4200 MHz
-40
SMA FEMALE
RF INPUT
DOWN CONVERTER
FROM
SYNTHESIZER
FROM IFLO
PHASE
EQUALIZER
ATTENUATOR
SMA FEMALE
70 MHz (+/-18 MHz)
2nd IF OUTPUT
+8 dBm
4610 TO 5195 MHz
SMA FEMALE
1060 MHz
+8 dBm
SMA FEMALE
LO INPUT
LO INPUT
dBm (TYP)
Figure 5-8. Down Converter Block Diagram