NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 6&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 270029
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<li>  A receiver with high selectivity has a: 

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<li> wide bandwidth 

<li> wide tuning range 

<li> narrow bandwidth 

<li> narrow tuning range 


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<li>  The abbreviation AGC means: 

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<li> attenuating gain capacitor 

<li> automatic gain control 

<li> anode-grid capacitor 

<li> amplified grid conductance 


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<li>  The audio output transformer in a receiver is required to: 

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<li> step up the audio gain 

<li> protect the loudspeaker from high currents 

<li> improve the audio tone 

<li> match the output impedance of the audio amplifier to the 
speaker 


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<li>  In the transmitter block diagram shown, the "linear 
amplifier": 
<img src = "ssbtx.gif" align = center width = 483 height = 
145> 
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<li> has all components arranged in-line 

<li> amplifies the modulated signal with no distortion 

<li> aligns the two sidebands correctly 

<li> removes any unwanted amplitude modulation from the 
signal 


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<li>  In the transmitter block diagram shown, the "frequency 
multiplier": 
<img src = "fmtx.gif" align = center width = 600 height = 143> 
<totallines = 16 >

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<li> translates the frequency of the modulated signal into the 
RF spectrum 

<li> changes the frequency of the speech signal 

<li> produces a harmonic of the oscillator signal 

<li> multiplies the oscillator signal by the speech signal 


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</ol>
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