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159 lines
4.2 KiB
Plaintext
159 lines
4.2 KiB
Plaintext
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% FILENAME = N15.TXT
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% HF Station Arrangement
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% Release version 3, October 2001
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%QUESTION: 1
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#15.1 In the block diagram shown, the "linear amplifier" is:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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an amplifier to remove distortion in signals from the transceiver
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an 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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% ans 2
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%QUESTION: 2
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#15.2 In the block diagram shown, the additional signal path above the
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"linear amplifier" block indicates that:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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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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the linear amplifier may be optionally switched out of circuit to reduce output power
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% ans 4
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%QUESTION: 3
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#15.3 In the block diagram shown, the "low pass filter" must be rated to:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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carry 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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% ans 1
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%QUESTION: 4
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#15.4 In the block diagram shown, the "SWR bridge" is a:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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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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device 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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% ans 3
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%QUESTION: 5
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#15.5 In the block diagram shown, the "antenna switch":
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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switches 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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% ans 1
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%QUESTION: 6
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#15.6 In the block diagram shown, the "antenna tuner":
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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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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adjusts the impedance of the antenna system seen at the transceiver output
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% ans 4
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%QUESTION: 7
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#15.7 In the block diagram shown, the "dummy load" is:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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used to allow adjustment of the transmitter without causing interference to
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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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% ans 1
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%QUESTION: 8
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#15.8 In the block diagram shown, the connection between the SWR bridge and the
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antenna switch is normally a:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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twisted pair cable
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coaxial cable
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quarter-wave matching section
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short length of balanced ladder-line
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% ans 2
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%QUESTION: 9
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#15.9 In this block diagram, the block designated "antenna tuner" is not normally necessary when:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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the 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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% ans 1
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%QUESTION: 10
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#15.10 In the block diagram shown, the connection between the "antenna tuner"
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and the "antenna" could be made with:
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<img src = "hfsta.gif" align = center width = 600 height = 170>
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<totallines = 16 >
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three-wire mains power cable
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heavy hook-up wire
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50 ohm coaxial cable
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an iron-cored transformer
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% ans 3
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