Comtech EF Data UT-4579 - Manual (Page 92)

UT4579 X-Band Up Converter MN/UT4579.IOM
Maintenance and Troubleshooting Rev. 0
76
Power
Supply
Reference
Oscillator
Fine
Step
Module
Sum
Loop
Module
Monitor & Control Assembly
RF Converter
Prime Power Cord Input
5/10 MHz Ref. Osc. Input J2
P1
J1
J3
J4
J5
J7
J9
Summary Fault Relay Output
Serial Comm. Interface
(RS-485 / RS-232C)- COM 1
High Speed Bus (HSB)
IF Input (IF)
J6
J8
RF Loop Input (LP IN)
RF Loop Output (LP OUT)
RF Output (RF)
Transmit
I/O Switch
Module
(TSM)
IF Loop Input (LP IN)
IF Loop Output (LP OUT)
Figure 34. Converter Signal and Interconnecting Cable Diagram
(with TSM Switching Module).
D.2 M AINTENANCE T ESTING
Use the instructions in Chapter 2, Installation, for installing the converter for checkout,
and the procedures in Chapter 3, System Operation, for operating the converter.
The converter is a Up Converter which translates the input IF frequency from 52 to 88
MHz (or optional 104 to 176 MHz) to an output RF frequency - for example, the RF
output frequency of the Model UT-4579 is 7900 to 8400 MHz. The IF input level is -35
dBm (typical), and the RF output level is +10 dBm at 1 dB compression.
D.2.1 T EST P OINT S AMPLES
The IF input and RF output can be monitored at the RF Sample Test Points on the front
panel. A BNC connector is provided for the IF sample, and an SMA connector is
provided for the RF output. The RF sample output level is -20 dBc nominal, and the IF
sample input level is -20 dBc nominal.