5.
6.
7.
(AF) to direct current (dc) for use by the
teleprinter equipment.
Black dc Patch Panel— The dc output of the
AN/UCC-1 is fed to the SB-1203/UG DC Patch
Panel. The dc patch panel permits the signal to
be patched to any cryptoequipment (discussed
later) desired.
Cryptoequipment— The cryptoequipment
decrypts the signal and connects its output to the
red SB-1210/UGQ DC Patch Panel.
Red dc Patch Panel— The SB-1210/UGQ can
be patched to a selected printer that prints the
signal in plain readable text.
HIGH-FREQUENCY SYSTEMS
The high-frequency (HF) band (3-30 MHz) is
primarily used by mobile and maritime units. The
military uses this band for long-range voice and
teleprinter communications. This band is also used as a
backup system for the satellite communications system.
We will discuss satellite communications later in this
chapter.
Figure 1-2 shows a typical high-frequency transmit
system. In transmitting teleprinter information, the
equipments shown in figure 1-2 perform the same
functions as the equipments shown in figure 1-1, except
the equipments in the high-frequency system do the
functions in reverse order.
In the HF transmit system, the AN/UCC-1
Telegraph Terminal converts dc signals into audio tone
signals. The output of the AN/UCC-1 is connected to
the transmitter transfer switchboard. The C-1004
Transmit Keying and Receive Control/Teleprinter is
used to key the transmitter during teleprinter
operations.
Voice communications from some remote locations
are also connected to the transmitter transfer
switchboard. Voice communications are initiated at a
handset (remote phone unit) and connected to the C-
1138 Radio Set Control. The output of the radio set
control is connected to the transmitter transfer
switchboard. The transmitter transfer switchboard
permits the operator to select the proper transmitter for
the frequency to be transmitted.
Figure 1-2.—High-frequency transmit system.
1-3
