Figure 2-12.—AN/SPA-25G with insert section.
Signal Data Converter provides the primary interface
between conventional equipment by multiplexing
analog information into a single digital data stream for
use by the AN/SPA-25G.
The AN/SPA-25G allows the maintainer to localize
faults quickly by using built-in-test (BIT) and test
messages for circuit and module checkout.
CV-3989/SP Signal Data Converter
The Signal Data Converter CV-3989/SP (SDC),
shown in figure 2-13, is designed for installation inside
the shipboard radar room. It is mated to the radar
(triggers), antenna azimuth, ship’s gyro-heading, and
ship’s speed or distance (ship’s pit log).
The SDC conditions and multiplexes the various data
inputs into a single digital data (RADDS) stream. This
permits a single cable to distribute RADDS stream data
throughout the ship. Previous distribution of radar and
navigation data required multiple cables. The SDC
accepts radar and navigation inputs and converts them into
five independent serial digital data (RADDS stream)
outputs. Over a single coaxial cable, the following data is
provided by the SDC RADDS data stream:
Figure 2-13.—Signal Data Converter, CV-3989/SP.
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