Key Topic 55: SSB Transmitters

Question 1

3-55G1: What will occur when a non-linear amplifier is used with a single-sideband phone transmitter?

A. Reduced amplifier efficiency.
B. Increased intelligibility.
C. Sideband inversion.
D. Distortion.

Answer 1

D. Distortion.

Question 2

3-55G2: To produce a single-sideband suppressed carrier transmission it is necessary to ___ the carrier and to ___ the unwanted sideband.

A. Filter, filter.
B. Cancel, filter.
C. Filter, cancel.
D. Cancel, cancel.

Answer 2

B. Cancel, filter.

Question 3

3-55G3: In a single-sideband phone signal, what determines the PEP-to-average power ratio?

A. The frequency of the modulating signal.
B. The degree of carrier suppression.
C. The speech characteristics.
D. The amplifier power.

Answer 3

C. The speech characteristics.

Question 4

3-55G4: What is the approximate ratio of peak envelope power to average power during normal voice modulation peak in a single-sideband phone signal?

A. 2.5 to 1.
B. 1 to 1.
C. 25 to 1.
D. 100 to 1.

Answer 4

A. 2.5 to 1.

Question 5

3-55G5: What is the output peak envelope power from a transmitter as measured on an oscilloscope showing 200 volts peak-to-peak across a 50-ohm load resistor?

A 1,000 watts.
B. 100 watts.
C. 200 watts.
D. 400 watts.

Answer 5

B. 100 watts.

Question 6

3-55G6: What would be the voltage across a 50-ohm dummy load dissipating 1,200 watts?

A. 245 volts.
B. 692 volts.
C. 346 volts.
D. 173 volts.

Answer 6

A. 245 volts.