B-003-12: Carrier suppression, SSB fundamentals
B-003-12-01:
What may happen if an SSB transmitter is operated with the microphone gain set too high?
It may cause splatter interference to other stations operating near its frequency
It may cause interference to other stations operating on a higher frequency band
It may cause atmospheric interference in the air around the antenna
It may cause digital interference to computer equipment
B-003-12-02:
What may happen if an SSB transmitter is operated with too much speech processing?
It may cause splatter interference to other stations operating near its frequency
It may cause digital interference to computer equipment
It may cause atmospheric interference in the air around the antenna
It may cause interference to other stations operating on a higher frequency band
B-003-12-03:
What is the term for the average power supplied to an antenna transmission line during one RF cycle, at the crest of the modulation envelope?
Peak envelope power
Peak output power
Average radio-frequency power
Peak transmitter power
B-003-12-04:
What is the usual bandwidth of a single-sideband amateur signal?
Between 2 and 3 kHz
1 kHz
2 kHz
Between 3 and 6 kHz
B-003-12-05:
In a typical single-sideband phone transmitter, what circuit processes signals from the balanced modulator and sends signals to the mixer?
Filter
IF amplifier
RF amplifier
Carrier oscillator
B-003-12-06:
What is one advantage of carrier suppression in a double-sideband phone transmission?
More power can be put into the sidebands
Only half the bandwidth is required for the same information content
Greater modulation percentage is obtainable with lower distortion
Simpler equipment can be used to receive a double-sideband suppressedcarrier signal
B-003-12-07:
What happens to the signal of an overmodulated single-sideband or double-sideband phone transmitter?
It becomes distorted and occupies more bandwidth
It becomes louder with no other effects
It occupies less bandwidth with poor high-frequency response
It has higher fidelity and improved signal-to-noise ratio
B-003-12-08:
How should the microphone gain control be adjusted on a single-sideband phone transmitter?
For slight movement of the ALC meter on modulation peaks
For full deflection of the ALC meter on modulation peaks
For 100% frequency deviation on modulation peaks
For a dip in plate current
B-003-12-09:
The purpose of a balanced modulator in an SSB transmitter is to:
suppress the carrier and pass on the two sidebands
make sure that the carrier and both sidebands are 180 degrees out of phase
ensure that the percentage of modulation is kept constant
make sure that the carrier and both sidebands are in phase
B-003-12-10:
In a SSB transmission, the carrier is:
reinserted at the receiver
transmitted with one sideband
inserted at the transmitter
of no use at the receiver
B-003-12-11:
The automatic level control (ALC) in a SSB transmitter:
controls the peak audio input so that the final amplifier is not overdriven
eliminates the transmitter distortion
increases the occupied bandwidth
reduces the system noise
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