10
Figure 1F.—Absorption wavemeter circuit.
IN ANSWERING QUESTION 1-61, REFER
TO FIGURE 1F.
1-61. When you are using an absorption
wavemeter to measure frequency, the
greatest accuracy may be obtained by
loosely coupling the pickup coil so that
the indicator lamp burns (a) with what
degree of brilliance (b) under what
resonance condition?
1. (a) Maximum brilliance
(b) when tuned to the resonant
frequency
2. (a) Maximum brilliance
(b) when not tuned to the resonant
frequency
3. (a) Dimly
(b) when not tuned to the resonant
frequency
4. (a) Dimly
(b) when tuned to the resonant
frequency
1-62. Which of the following instruments
should be used to accurately measure a
frequency in the shf range?
1. Absorption wavemeter
2. Resonant, cavity-type wavemeter
3. Resonant, coaxial-line-type
wavemeter
4. Both 2 and 3 above
1-63. In a cavity wavemeter, moving the
plunger farther into the cavity space
causes which of the following changes to
(a) the cavity size and (b) the resonant
frequency of the cavity?
1. (a) Decrease
(b) increase
2. (a) Decrease
(b) decrease
3. (a) Increase
(b) decrease
4. (a) Increase
(b) increase
1-64. For which of the following purposes is a
cathode-ray oscilloscope used?
1. To measure microwave energy
2. To visually analyze waveforms
3. To provide frequency modulation
4. To locate stray radio interference
1-65. The synchroscope contains which of the
following circuits?
1. Retrace blanking circuit
2. A wide band amplifier
3. A trigger sweep
4. All of the above
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