NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 6&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 264678
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<br>

<li>  If two receivers are compared, the more sensitive 
receiver will produce: 

<ol type = a>

<li> more than one signal 

<li> less signal and more noise

<li> more signal and less noise 

<li> a steady oscillator drift 


</ol>
<br>

<li>  A superhet receiver for SSB reception has an insertion 
oscillator to: 

<ol type = a>

<li> replace the suppressed carrier for detection 

<li> phase out the unwanted sideband signal 

<li> reduce the passband of the IF stages 

<li> beat with the received carrier to produce the other 
sideband 


</ol>
<br>

<li>  A superhet receiver receives an incoming signal of 3540 
kHz and the 
local oscillator produces a signal of 3995 kHz. The IF 
amplifier is tuned to: 

<ol type = a>

<li> 455 kHz 

<li> 3540 kHz 

<li> 3995 kHz 

<li> 7435 kHz 


</ol>
<br>

<li>  In the transmitter block diagram shown, the "linear 
amplifier": 
<img src = "ssbtx.gif" align = center width = 483 height = 
145> 
<totallines = 15 >

<ol type = a>

<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 


</ol>
<br>

<li>  The signal from a CW transmitter consists of: 

<ol type = a>

<li> a continuous, unmodulated RF waveform 

<li> a continuous RF waveform modulated with an 800 Hz 
Morse signal 

<li> an RF waveform which is keyed on and off to form Morse 
characters 

<li> a continuous RF waveform which changes frequency in 
synchronism with 
an applied Morse signal 

</ol>
</ol>
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