Comtech EF Data UT-4514F Especificaciones descargar pdf (Pagina 28)

UT-4500A Series Upconverters Revision 1

Introduction MN-UT4500A

1–4

1.2.2 RF Signal Conversion

As a typical example of the RF signal processing, in the Model UT-4514-A Upconverter, the 70

MHz IF input is mixed in the first mixer with a 1150 MHz IFLO signal. The IFLO is locked to a 5/10

MHz reference oscillator. The first mixer is located in the Signal Path Assembly.

The intermediate IF is 1220 MHz, which is mixed in the second stage mixer with 12780 to 13280

MHz synthesizer signal to provide an RF output frequency of 14000 to 1451X MHz in 125 KHz

fine tuning steps. The synthesizer is also locked to the 5/10 MHz reference oscillator. The second

mixer is located in the upconverter Signal Path Module, and the synthesizer consists of the

Coarse/Fine Step Module and Sum Loop Module.

Figure 1-3 depicts the operational schematic for a typical UT-4500-A Series Upconverter in single

thread (standalone) applications. For more information about the UT-4500-A’s use in redundant

applications, refer to Appendix B. REDUNDANT SYSTEM OPERATION.

Figure 1-3. Typical Functional Block Diagram (UT-4512-A shown)

1.2.3 Monitor & Control

The Monitor & Control Assembly is designed to monitor the functions of the upconverter, and

provide the control for remote and local command inputs to the upconverter.

Remote control inputs are provided through the EIA-232C or EIA-485 communications port on

the rear of the panel, or by local operator inputs through the keypad on the front panel.

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Comtech EF Data UT-4514F Especificaciones Pagina 28