ANSWERS TO QUESTIONS Q1. THROUGH Q29.

A1. Frequency and phase.
A2. Frequency-shift keying.
A3. Resistance to noise interference.
A4. Instantaneous frequency.
A5. As the ratio of the frequency deviation to the maximum frequency deviation allowable.
A6. The number of significant sidebands and the modulating frequency.
A7. By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
A8. Collector-to-emitter capacitance.
A9. An LCR filter.
A10. Capacitance.
A11. Phase.
A12. A phase-shift network such as a variable resistor and capacitor in series.
A13. Cw and frequency-shift keying.
A14. Pulse modulation.
A15. Pulse-repetition time.
A16. Rest time.
A17. Peak power during a pulse averaged over pulse time plus rest time.
A18. Either a fixed spark gap that uses a trigger pulse to ionize the air between the contacts, or a rotary gap that is similar to a mechanical switch.
A19. Power source, a circuit for storing energy, a circuit for discharging the storage circuit, and a pulse transformer.
A20. Some characteristic of the pulses has to be varied.
A21. 2.5 times the highest modulating frequency.
A22. Both are susceptible to noise and interference.
A23. The time duration of the pulses or the time of occurrence of the pulses.
A24. Either, or both at the same time.
A25. It requires synchronization between the transmitter and receiver.
A26. A method of pulse modulation in which a modulating wave is used to frequency modulate a pulse-generating circuit.
A27. Quantization.
A28. 50.
A29. Low susceptibility to noise.