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3-38. Oscillations in an echo box are known as
ringing. Which of the following
conditions cause this ringing?
1. A weak transmitter
2. A saturated receiver
3. A normally operating receiver
4. A normally operating transmitter
3-39. What constitutes the single most useful
measurement you can make with the
echo box?
1. Ring time
2. Duty cycle
3. Power distribution
4. Frequency distribution
3-40. Desirable transmitter output power
characteristics include what relative
levels of (a) peak power and (b) average
power?
1. (a) Low
(b) low
2. (a) Low
(b) high
3. (a) High
(b) high
4. (a) High
(b) low
3-41. Most transmitter power readings are
referenced to which of the following
quantities?
1. 1 microwatt
2. 1 milliwatt
3. 1 watt
4. 1 kilowatt
3-42. Which of the following factors
determines the overall performance of a
radar receiver?
1. Bandwidth
2. Sensitivity
3. Recovery time of the tr
4. All of the above
3-43. Of the following receiver special circuits,
which one is used during sensitivity
tests?
1. Afc
2. Agc
3. Ftc
4. Iagc
3-44. The ability of a receiver to detect weak
signals can be determined by which of
the following measurements?
1. Noise figure
2. Minimum discernable signal
3. Both 1 and 2 above
4. Bandwidth
3-45. When several mds checks are to be taken
over a period of time, the length of the
test pulse used in the tests should
1. be the same on each check
2. be different on each check
3. vary with the transmitter pulse length
on each check
4. vary with the noise figure on each
check
3-46. When expressing the sensitivity of a
radar receiver, which of the following
quantities is used?
1. The signal generator reading
2. The combined attenuation value of
the connecting cable and directional
coupler
3. The sum of both 1 and 2 above
4. The attenuation value of the signal
generator
3-47. Tr recovery time places limits on which
of the following quantities?
1. Minimum range
2. Maximum range
3. Receiver bandwidth
4. Receiver sensitivity
