REVIEW QUESTIONS

the signal data converter, where it is converted to audio tones and then transmitted out over the selected radio. When the message is complete, REC (receive) is selected on the keyboard. This selection allows the system to receive phase tones and incoming messages from other stations on the frequency. The on-line mode is designed to simplify the work of the operator. Actual system operation is covered in various software publications. In general, the operator types an outgoing message in the central computer. The operator performs all the operations described above, except XMIT is selected on the TTY keyboard. Depression of the XMIT switch on the keyboard directs the central computer to send the stored message through Communications Interface No. 1 into the TTY system. In the same manner, when REC is selected on the keyboard and CMPTR selected on the HSP, any incoming messages are sent to the central computer. Currently, the computer has the ability to store one message of approximately 800 characters for review by the operator. In addition to teletype data, the TTY system can send and receive data to and from the central computer. In input data, the operator simply selects CONST & EDIT on the keyboard. Any keyboard depressions are then sent to the central computer via the communications interface. To produce hardcopy of computer data, CMPTR is selected on the HSP. Software functions then allow the central computer to print data on the HSP via Communications Interface No. 1. This data is sent at 3,000 words per minute regardless of the WPM SPEED switch on the HSP. Q1. Q2. Q3. Q4. Q5. Q6. Q7. Q8. Q9. Q10. Q11. Q12. Q13. REVIEW QUESTIONS What is the most important means of communi- cating in the Navy today? What frequencies are included in the super high-frequency band? How many LS-602/AI panels are there in a typical aircraft? What type of encoding/decoding is used in the ICCG system? What is the actual frequency range of the AN/ARC-197 radio set? How many preset channels are available with the AN/ARC-187 radio set? What fault is indicated when the fault indicator on the C-11950/ARC-187 control box flashes at a slow rate? The HF-2 long-wire antenna has degraded operation at which frequencies? What is the purpose of the lightning arrester used in the HF system? What radio sets can be used with the data link system? Who has primary responsibility for the hardware setup of the data link system? Which unit in the TTY system provides the interface with the radios? Which unit connects the TTY system with the central computer? 1-25