In the block diagram shown, the "linear amplifier" is
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an amplifier to remove distortion in signals from the transceiver
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Correct Answeran optional amplifier to be switched in when higher power is required
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an amplifier with all components arranged in-line
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a push-pull amplifier to cancel second harmonic distortion
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In the block diagram shown, the additional signal path above the "linear amplifier" block indicates that
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some power is passed around the linear amplifier for stability
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"feed-forward" correction is being used to increase linearity
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the linear amplifier input and output terminals may be short-circuited
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Correct Answerthe linear amplifier may be optionally switched out of circuit to reduce output power
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In the block diagram shown, the "low pass filter" must be rated to
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Correct Answercarry the full power output from the station
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filter out higher-frequency modulation components for maximum intelligibility
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filter out high-amplitude sideband components
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emphasise low-speed Morse code output
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In the block diagram shown, the "SWR bridge" is a
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switched wave rectifier for monitoring power output
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static wave reducer to minimize static electricity from the antenna
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Correct Answerdevice to monitor the standing-wave-ratio on the antenna feedline
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short wave rectifier to protect against lightning strikes
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In the block diagram shown, the "antenna switch"
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Correct Answerswitches the transmitter output to the dummy load for tune-up purposes
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switches the antenna from transmit to receive
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switches the frequency of the antenna for operation on different bands
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switches surplus output power from the antenna to the dummy load to avoid distortion.
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In the block diagram shown, the "antenna tuner"
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adjusts the resonant frequency of the antenna to minimize harmonic radiation
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adjusts the resonant frequency of the antenna to maximise power output
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changes the standing-wave-ratio on the transmission line to the antenna
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Correct Answeradjusts the impedance of the antenna system seen at the transceiver output
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In the block diagram shown, the "dummy load" is
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Correct Answerused to allow adjustment of the transmitter without causing interference to others
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a load used to absorb surplus power which is rejected by the antenna system
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used to absorb high-voltage impulses caused by lightning strikes to the antenna
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an additional load used to compensate for a badly-tuned antenna system
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In the block diagram shown, the connection between the SWR bridge and the antenna switch is normally a
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twisted pair cable
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Correct Answercoaxial cable
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quarter-wave matching section
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short length of balanced ladder-line
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In this block diagram, the block designated "antenna tuner" is not normally necessary when
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Correct Answerthe antenna input impedance is 50 ohms
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a half wave antenna is used, fed at one end
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the antenna is very long compared to a wavelength
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the antenna is very short compared to a wavelength
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In the block diagram shown, the connection between the "antenna tuner" and the "antenna" could be made with
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three-wire mains power cable
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heavy hook-up wire
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Correct Answer50 ohm coaxial cable
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an iron-cored transformer
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