Figure 1-3 Functional Block Diagram Of The Upconverter Section - Comtech EF Data CSAT-5060 Installation And Operation Manual

5 to 25 Watt Model C-Band Transceiver
Introduction
The second mixer up converts the 1250 MHz IF signal to the desired output frequency. It uses
low side LO injection in the 4595 to 5175 MHz frequency range provided by the upconverter
RFLO in 1.000 or 2.500 MHz steps. Both step sizes are automatically selectable. The
upconverted signal is then filtered to reject the RFLO leakage, and any other unwanted mixer
spurs at the mixer output. The output signal is then amplified by a series of internally matched
power FET's to raise the power level of the output signal to the specified level. An isolator is
provided at the output of the high power output stage to protect it from mismatches at the output
connection to the antenna feed.
70 +/ - 1 8 M Hz VA R
ATTEN
CO M M & C 10 M Hz
REFERENCE
Figure 1-3. Functional Block Diagram of the
1.3 M
ONITOR
The Monitor & Control (M & C) unit is designed to monitor the functions of the transceiver, and
provide the control for remote command inputs to the up and down converter sections. It controls
the attenuator settings, the frequency settings, and it monitors the alarm system and logs any
alarms that might occur. Remote control inputs are provided through the RS-232 or RS-485
connections in the circular COM connector either by remote computer interface or by local
operator inputs through the external hand held control unit
VA R
ATTEN
IFLO
11 8 0 M Hz
Upconverter Section
& C
ONTROL
1 2 50 M Hz BP F
RFLO
11 8 0 M Hz
5 17 5 -
5 47 5 M Hz
.
1-4
MN/CSAT506025.IOM
SSP A
PO WER
SUP PLY
Revision 1
2 5 WA TTS
64 2 5 - 6 72 5 M Hz