Key Topic 17: Timer - Trigger - Synchronizer Circuits

Question 1

8-17B1: What RADAR circuit determines the pulse repetition rate (PRR)?

A. Discriminator.
B. Timer (synchronizer circuit)
C. Artificial transmission line.
D. Pulse-rate-indicator circuit.

Answer 1

B. Timer (synchronizer circuit)

Question 2

8-17B2: The triggering section is also known as the:

A. PFN.
B. Timer circuit.
C. Blocking oscillator.
D. Synchronizer.

Answer 2

D. Synchronizer.

Question 3

8-17B3: Operation of any RADAR system begins in the:

A. Triggering section.
B. Magnetron.
C. AFC.
D. PFN.

Answer 3

A. Triggering section.

Question 4

8-17B4: The timer circuit:

A. Determines the pulse repetition rate (PRR).
B. Determines range markers.
C. Provides blanking and unblanking signals for the CRT.
D. All of the above.

Answer 4

D. All of the above.

Question 5

8-17B5: Pulse RADARs require precise timing for their operation. Which type circuit below might best be used to provide these accurate timing pulses?

A. Single-swing blocking oscillator.
B. AFC controlled sinewave oscillator.
C. Non-symmetrical astable multivibrator.
D. Triggered flip-flop type multivibrator.

Answer 5

A. Single-swing blocking oscillator.

Question 6

8-17B6: Unblanking pulses are produced by the timer circuit. Where are they sent?

A. IF amplifiers.
B. Mixer.
C. CRT.
D. Discriminator.

Answer 6

C. CRT.