SUPER-HIGH-FREQUENCY SYSTEMS

The super-high-frequency (SHF) band (3-30 GHz) is strictly for line-of-sight communications. It is configured much the same as the UHF system. SHF is mainly used for satellite communications.

SHF satellite communications is a high-volume system that offers reliable tactical and strategic communications services to U.S. Navy elements ashore and afloat. The system is composed of the terminal segment, consisting of U.S. Navy-operated Earth terminals and mobile terminals. It also includes a portion of the Defense Satellite Communications System (DSCS) satellite segment. Navy Super High Frequency Satellite Communications, NTP 2, Section 1 (C), provides comprehensive coverage of the Navy SHF satellite system.

PATCH PANELS

Teleprinter patch panels are used for the interconnection and transfer of teleprinter signals aboard ship. In the previous block diagrams two patch panels, one labeled red, the other black, were shown. These are the teleprinter patch panels SB-1210/UG and

Figure 1-6.-Ultra-high-frequency receive system.

SB-1203/UGQ (figure 1-7). The SB-1210/UG is intended for use with cryptographic devices; the SB-1203/UGQ is a general-purpose panel.

The patch panels are red or black to identify secure and nonsecure information. Red indicates that secure (classified) information is being passed through the panel. Black indicates that nonsecure (unclassified) information is being passed through the panel.

Both panels are also labeled with signs. The red panel sign has 1-inch-high white block letters that read "RED PATCH PANEL." The black panel normally has two black signs containing l-inch-high white block letters. One sign reads "BLACK PATCH PANEL" and the other, "UNCLAS ONLY."

Each panel contains six channels. Each channel has its own series circuit of looping jacks, set jacks, and a rheostat for adjusting line current. The number of looping and set jacks in each channel varies with the panel model. Each panel includes a meter and rotary selector switch for measuring the line current in any channel.

Six miscellaneous jacks are contained in each panel. Any teleprinter equipment not regularly assigned to a channel maybe connected to one of these jacks. In some instances, commonly used combinations of equipment are permanently wired together within the panel (called normal-through).

Figure 1-7.-Teleprinter patch panels.