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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.

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