Comtech EF Data CST-5000 - Manual (Page 124)

CST-5000 C-Band Satellite Terminal 140 MHz IF Option
Rev. 9 A–5
A.1.3 Down Converter
The function of the down converter is to convert the C-Band signal from the LNA to a
140 MHz IF signal for use in the modem.
Refer to
Figure Appendix A-3 for a functional block diagram of the down converter.
3620 TO 4200 MHz
-40 dBm (TYP)
SMA FEM ALE
RF INPUT
DOWN CONVERTER
FROM
SYNTHESIZER
FROM IFLO
PHASE
EQUALIZER
ATTENUATOR
SMA FEMALE
140.0 MHz (+/-36 MHz)
2nd IF OUTPUT
4592.5 TO
5172.5 MHz
+8 dBm
SMA FEMALE
1112.5 MHz
+8 dBm
SMA FEMALE
LO INPUT
LO INPUT
Figure Appendix A-3. Down Converter Block Diagram