NEETS MODULE 17 CHAPTER 1 INTRODUCTION TO RADIO-FREQUENCY COMMUNICATIONS
Q1. What are the two types of electrical communications?
Q2. What is the main advantage of radiotelegraph communications?
Q3. Why is radiotelephone one of the most useful methods of military communications?
Q4. What are the disadvantages of radiotelephone communications?
Q5. What is the main use of a radio teletypewriter?
Q6. What is facsimile?
Q7. A system is subdivided into what levels?
Q8. In the example 1A6CR3, what is the assembly designator?
Q9. he majority of vlf transmitters are used for what purpose?
Q10. Today the Navy uses lf communications as a segment of what operational system?
Q11. Why does the Navy only use the upper and lower ends of the mf band
Q12. What are the four general types of communications services in the hf band?
Q13. A message transmitted on several frequencies at the same time is an example of what type oftransmission?
Q14. Physically separating receive antennas is an example of what technique?
Q15. When using frequencies above 30 megahertz, you are normally limited to using what range?
Q16. The naval communications system is made up of what two groups of communications?
Q17. What are the five most prominent communications modes of operation?
Q18. What four switched networks are part of the defense communications system?
Q19. What two elements support only designated Navy requirements?
NEETS MODULE 17 CHAPTER 2 INTRODUCTION TO COMMUNICATIONS THEORY
Q1. What are the four basic transmitter types?
Q2. What is the function of the oscillator in a cw transmitter?
Q3. What is the final stage of a transmitter?
Q4. What purpose does a microphone perform in an AM transmitter?
Q5. In an fm transmitter, when does an oscillator generate only a steady frequency?
Q6. What is a harmonic?
Q7. If the fundamental frequency is 200 megahertz, what is the third harmonic?
Q8. Why are frequency multipliers used?
Q9. What are two advantages of ssb transmission?
Q10. What is the purpose of an order-wire circuit
Q11. What four basic functions must a receiver perform?
Q12. What are the four basic receiver characteristics?
Q13. What frequency conversion principle is used to develop the IF?
Q14. What is the function of the detector?
Q15. What is the major disadvantage of an fm signal as compared to an AM signal?
Q16. What two components give a ssb receiver its advantages over an AM superheterodyne receiver?
Q17. What does manual gain control do to strong and weak signals, respectively?
Q18. What is the purpose of agc/avc in a receiver?
Q19. What is a disadvantage of agc?
Q20. What is the main difference between agc and dagc?
Q21. What is the function of the bfo?
Q22. What is the purpose of a squelch circuit?
Q23. What does a tone control circuit in a receiver do to the audio signal?
Q24. What is the function of a crystal filter in a receiver?
Q25. What is the primary function of an afc circuit?
Q26. What is frequency synthesis?
NEETS MODULE 17 CHAPTER 3 FUNDAMENTAL SYSTEMS EQUIPMENT
Q1. What are the basic functions of a handset?
Q2. What capability does a transmitter transfer switchboard provide?
Q3. What function does a receiver transfer switchboard perform?
Q4. If the rf amplifier discussed has an 80 milliwatt input, what would be the maximum output?
Q5. What are the tuning modes for the coupler group discussed?
Q6. What is the purpose of an antenna coupler?
Q7. Why is the coupler pressurized with nitrogen?
Q8. What are the transmitter operating modes?
Q9. What type of tuning does the receiver use?
Q10. What is the function of an antenna patch panel?
Q11. What are the functions of a multicoupler?
Q12. What are the terms used to describe an open or closed telegraph circuit?
Q13. How many units are in a tty signal and what are they?
Q14. There are not enough combinations of the five-unit code to handle the alphabet, symbols and soforth. What is used to increase the number of available code combinations?
Q15. What are the two teletypewriter modes of operation?
Q16. Define baud.
Q17. Define bit.
Q18. What are the two types of dc operations used to represent mark and space conditions?
Q19. What is the function of a keyer?
Q20. What is the function of a converter?
Q21. Basically describe an afts system.
Q22. Basically describe an rfcs system
Q23. Most Navy tty sets operate at what speeds?
Q24. A receive tty set provides outputs in what formats?
Q25. What does the color red indicate on a tty patch panel?
Q26. What are the functions of cryptographic equipment?
Q27. What are the functions of a converter-comparator group?
Q28. What is the function of a tone terminal set?
Q29. What are the two types of multiplexing?
Q30. What is the purpose of multiplexing?
Q31. The transmission of still images over an electrical communications system is known as what?
Q32. The term TEMPEST refers to what?
Q33. What are the three fundamental requirements of a military communications system?
Q34. Which of the above requirements is most important?
Q35. What is the purpose of QMCS?
Q36. What is emi?
Q37. What are the two emi transmission methods?
Q38. Electromagnetic radiation is hazardous to personnel in what two ways?
Q39. What is the most useful and widespread technique to reduce rf burn hazards?
NEETS MODULE 17 CHAPTER 4 INTRODUCTION TO SATELLITE COMMUNICATIONS
Q1. What are the two types of communications satellites?
Q2. A typical satellite communications operational link consists of a satellite and what two othercomponents?
Q3. A satellite in a synchronous orbit can cover how much of the surface of the earth?
Q4. What areas of the earth are not normally covered by satellites?
Q5. What was the major operational limitation of early communications satellites?
Q6. Satellite orientation in space is important for what two reasons?
Q7. What type of antennas are generally used at earth terminals?
Q8. Why do earth terminals require highly sensitive receivers?
Q9. What is the range of earth terminal transmitter output power?
Q10. What is the function of shipboard receive-only equipment?
Q11. What types of modulation are shipboard receive-only equipment designed to receive?
Q12. Why is satellite acquisition and tracking important?
Q13. What are the two limitations to an active satellite communications system?
NEETS MODULE 17 CHAPTER 5 INTRODUCTION TO MISCELLANEOUS COMMUNICATIONS SYSTEMS AND EQUIPMENT
Q1. What is a dummy load?
Q2. What is the function of a product detector?
Q3. What is the frequency range of the mf band?
Q4. Microwave systems use what portion of the atmosphere?
Q5. What is the voice channel capacity of an los communications system?
Q6. What is the one-hop transmission range of a tropospheric-scatter system?
Q7. What is the primary advantage of NTDS over conventional systems?
Q8. What are the three NTDS data transmission subsystems?
Q9. What are the three main design considerations of portable equipment?
Q10. Lasers operate in what portion of the frequency spectrum?
Q11. What are the two types of lasers?
Q12. What are the effects of adverse weather on the laser beam?
This content is neither created nor endorsed by Google.