Key Topic 50: Receiver Performance

Question 1

3-50F1: Where would you normally find a low-pass filter in a radio receiver?

A. in the AVC circuit.
B. In the oscillator stage.
C. In the power Supply.
D. A and C, but not B.

Answer 1

D. A and C, but not B.

Question 2

3-50F2: How can ferrite beads be used to suppress ignition noise? Install them:

A. In the resistive high voltage cable every 2 years.
B. Between the starter solenoid and the starter motor.
C. Install them in the primary and secondary ignition leads.
D. In the antenna lead.

Answer 2

C. Install them in the primary and secondary ignition leads.

Question 3

3-50F3: What is the term used to refer to the condition where the signals from a very strong station are superimposed on other signals being received?

A. Intermodulation distortion.
B. Cross-modulation interference.
C. Receiver quieting.
D. Capture effect.

Answer 3

B. Cross-modulation interference.

Question 4

3-50F4: What is cross-modulation interference?

A. Interference between two transmitters of different modulation type.
B. Interference caused by audio rectification in the receiver preamp.
C. Modulation from an unwanted signal heard in addition to the desired signal.
D. Harmonic distortion of the transmitted signal.

Answer 4

C. Modulation from an unwanted signal heard in addition to the desired signal.

Question 5

3-50F5: In figure 3F15 (EL3-D1) at what point in the circuit (labeled 1 through 4) could a DC voltmeter be used to monitor signal strength?

A. 1
B. 2
C. 3
D. 4

Answer 5

D. 4

Question 6

3-50F6: Pulse type interference to automobile radio receivers that appears related to the speed of the engine can often be reduced by:

A. Installing resistances in series with spark plug wires.
B. Using heavy conductors between the starting battery and the starting motor.
C. Connecting resistances in series with the battery.
D. Grounding the negative side of the battery.

Answer 6

A. Installing resistances in series with spark plug wires.