Questions With Answers For H F Station

Question File Number 15



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


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Compiled Sun Nov 28 2010 at 8:43:30pm


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