NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 5&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 264678
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<li>  In the block diagram shown, the "antenna switch": 
<img src = "hfsta.gif" align = center width = 600 height = 
170> 
<totallines = 16 >

<ol type = a>

<li> switches the transmitter output to the dummy load for 
tune-up purposes 

<li> switches the antenna from transmit to receive 

<li> switches the frequency of the antenna for operation on 
different bands 

<li> switches surplus output power from the antenna to the 
dummy load to avoid 
distortion. 

</ol>
<br>

<li>  In the block diagram of the receiver shown, the output 
frequency of the 
"oscillator" is: 
<img src = "ssbrx.gif" align = center width = 600 height = 
161> 
<totallines = 15>

<ol type = a>

<li> the same as that of the incoming received signal 

<li> the same as that of the IF frequency 

<li> different from both the incoming signal and IF frequencies 

<li> at a low audio frequency 


</ol>
<br>

<li>  In this receiver, an audio frequency gain control 
would be associated with the block labelled: 
<img src = "fmrx.gif" align = center width = 600 height = 151> 
<totallines = 16>

<ol type = a>

<li> AF amplifier 

<li> frequency demodulator 

<li> speaker, phones 

<li> IF amplifier 


</ol>
</ol>
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