NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 6&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 267036
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<li>  The figure in a receiver's specifications which indicates 
its sensitivity is the: 

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<li> bandwidth of the IF in kilohertz 

<li> audio output in watts 

<li> signal plus noise to noise ratio 

<li> number of RF amplifiers 


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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 "driver 
buffer": 
<img src = "cwtx.gif" align = center width = 404 height = 163> 
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<li> filters any sharp edges from the input signal 

<li> drives the power amplifier into saturation 

<li> provides isolation between the oscillator and power 
amplifier 

<li> changes the frequency of the master oscillator signal 


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<li>  The signal from a balanced modulator consists of: 

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<li> a carrier and two sidebands 

<li> a carrier and one sideband 

<li> no carrier and two sidebands 

<li> no carrier and one sideband 


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