Key Topic 22: Amplifiers

Question 1

8-22C1: Overcoupling in a RADAR receiver will cause?

A. Improved target returns.
B. Increase the range of the IAGC.
C. Decrease noise.
D. Oscillations.

Answer 1

D. Oscillations.

Question 2

8-22C2: The usual intermediate frequency of a shipboard RADAR unit is:

A. 455 kHz.
B. 10.7 MHz.
C. 30 or 60 MHz.
D. 120 MHz.

Answer 2

C. 30 or 60 MHz.

Question 3

8-22C3: The IF Amplifier bandwidth is:

A. Wide for short ranges and narrow for long ranges.
B. Wide for long ranges and narrow for short ranges.
C. Constant for all ranges.
D. Adjustable from the control panel.

Answer 3

A. Wide for short ranges and narrow for long ranges.

Question 4

8-22C4: A logarithmic IF amplifier is preferable to a linear IF amplifier in a RADAR receiver because it:

A. Has higher gain.
B. Is more easily aligned.
C. Has a lower noise figure.
D. Has a greater dynamic range.

Answer 4

D. Has a greater dynamic range.

Question 5

8-22C5: The high-gain IF amplifiers in a RADAR receiver may amplify a 2 microvolt input signal to an output level of 2 volts. This amount of amplification represents a gain of:

A. 60 dB.
B. 100 dB.
C. 120 dB.
D. 1,000 dB.

Answer 5

C. 120 dB.

Question 6

8-22C6: In a RADAR receiver AGC and IAGC can vary between:

A. 10 and 15 dB.
B. 20 and 40 dB.
C. 30 and 60 dB.
D. 5 and 30 dB.

Answer 6

B. 20 and 40 dB.