Maintenance testing, Test point samples, D.2 m – Comtech EF Data DT-4500 Series User Manual
Page 104: D.2.1 t, Aintenance, Esting
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DT4500 Series Down Converters
MN/DT4500.IOM
Maintenance and Troubleshooting
Revision 1
86
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 35. 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 Down Converter which translates the input RF frequency to an output
IF frequency. The RF input level is -45 dBm (typical), and the RF output level is 0 dBm
(typical).
D.2.1 T
EST
P
OINT
S
AMPLES
The IF output and RF input 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 level is -20 dBc nominal.