2-63
ANSWERS TO QUESTIONS Q1. THROUGH Q29.
A-1.
Frequency and phase.
A-2.
Frequency-shift keying.
A-3.
Resistance to noise interference.
A-4.
Instantaneous frequency.
A-5.
As the ratio of the frequency deviation to the maximum frequency deviation allowable.
A-6.
The number of significant sidebands and the modulating frequency.
A-7.
By changing the reactance of an oscillator circuit in consonance with the modulating voltage.
A-8.
Collector-to-emitter capacitance.
A-9.
An LCR filter.
A-10.
Capacitance.
A-11.
Phase.
A-12.
A phase-shift network such as a variable resistor and capacitor in series.
A-13.
Cw and frequency-shift keying.
A-14.
Pulse modulation.
A-15.
Pulse-repetition time.
A-16.
Rest time.
A-17.
Peak power during a pulse averaged over pulse time plus rest time.
A-18.
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.
A-19.
Power source, a circuit for storing energy, a circuit for discharging the storage circuit, and a
pulse transformer.
A-20.
Some characteristic of the pulses has to be varied.
A-21.
2.5 times the highest modulating frequency.
A-22.
Both are susceptible to noise and interference.
A-23.
The time duration of the pulses or the time of occurrence of the pulses.
A-24.
Either, or both at the same time.
A-25.
It requires synchronization between the transmitter and receiver.
A-26.
A method of pulse modulation in which a modulating wave is used to frequency modulate a
pulse-generating circuit.
