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Mark and space signals in the teletypewritercharacter R. 2-16 ter) quickly indicates line or equipment trouble. Using neutral signaling, this may only indicate that a steady space is being transmitted. This condition is known as running open. The teletype appears to be running because it is decoding the constant spaces that cause the type hammer to continually strike the type box, but there is no printing or movement across the page. wave is used to carry the mark and space information. A keyer is used to change the dc pulses from the tty into mark and space modulation for the transmitter carrier wave.

The IF output is amplitudelimited and applied to an automatic frequency control (afc) discriminator, which controls the frequency of the LO. The signal is also applied to an IF discriminator, a de-emphasis circuit, and a squelch circuit that disconnects the baseband amplifier and demultiplexing equipment if noise increases above a preset level. After the squelch circuit, the signal passes through a baseband amplifier and then to the demultiplexing equipment, where the original intelligence is retrieved.

The RPU is connected to the secure voice matrix, which is the tie point for the connection of multiple remote phone units. The matrix output is fed to the secure voice equipment that encrypts the information. This encrypted information is then fed to an SB-988/SRT transmitter transfer switchboard. ULTRAHIGH-FREQUENCY COMMUNICATIONS The ultrahigh-frequency (uhf) band is used for line-of-sight (short range) command and control communications. As we stated earlier, line-of-sight means that both antennas are aimed at one another, with no obstruction in between.

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