In the following paragraphs, we will discuss the
equipment shown in the RFCS transmit (send) system
in figure 2-18.
The Model 28 family and the AN/UGC-143 series
are the two tty sets currently used by the Navy.
Although the AN/UGC-143 is not shown in figure
2-17, we will discuss its characteristics later. There are
several tty sets included in the Model 28 family with
varying weights and sizes. They feature high operating
speeds, quiet operation, and are particularly suited for
shipboard use under the severe conditions of roll,
vibration, and shock.
Model 28 ttys may be composed of the following
components, depending upon their specific function: a
cabinet, keyboard, page printer, typing perforator,
transmitter distributor, typing reperforator, power
distribution panels, and power supply.
All equipment components are housed in the
cabinet. Transmissions are initiated through the
keyboard or transmitter distributor. Received signals
are printed on the page printer. Monitored
transmissions can also be printed on the page printer.
The typing perforator and reperforator are used for
preparing tapes that can be stored for future
transmission through the transmitter distributor.
The AN/UGC-143A(V) is also known as the Navy
Standard Teleprinter (NST) and has the following
Accepts Baudot code or ASCII
Bulk storage unit contains tape drives similar to
those found in the AN/USH-26
Can be configured to interface with Navy
standard personal computers
Fully compatible with current crypto devices
Capable of supporting paper tape operations
Tty panels SB-1203/UG and SB-1210/UGQ
are used for interconnection and transfer of
shipboard tty equipment. The SB-1203/UG is a
general-use panel and the SB-1210/UGQ is intended
for use with crypto. In addition, tty panels furnish a
central point for connecting the dc supply into the
teletypewriter circuits. So, one source of supply can
be used for all the circuits passing through a
One procedural note: Anyone patching or
unpatching circuits from a tty panel must be sure to
pull the plug from the looping jack before
removing the other plug from the set (machine)
jack. Pulling the set jack first interrupts all tty
message traffic on that channel. I T A L S O
PRODUCES A DANGEROUS DC VOLTAGE
ON THE EXPOSED PLUG!
Cryptographic equipment is used to encode and
decode messages that require security handling. To do
this, the crypto equipment must be compatible on both
the transmit and receive ends.
Remote Transmitter Control
The remote transmitter control unit is mounted
close to the tty keyboard, and permits remote
control of the transmitter. For RFCS operation, the
operator sets the three-position rotary switch to
CFS SEND to transmit and CFS REC for receiv-
ing. The TONE S/R position is used for AFTS
transmit and receive.
The SB-863/SRT switchboard is used in this
system to connect the remote transmitter control to the
transmitter to be used.
The transmitter is used to transmit the RFCS
signal. It is important that the operator tune the
transmitter to the proper frequency.