NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 5&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 267036
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<li>  In the block diagram shown, the "antenna switch": 
<img src = "hfsta.gif" align = center width = 600 height = 
170> 
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<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. 

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<li>  In the block diagram of the receiver shown, the "filter" 
rejects: 
<img src = "ssbrx.gif" align = center width = 600 height = 
161> 
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<li> AM and RTTY signals 

<li> unwanted mixer outputs 

<li> noise bursts 

<li> broadcast band signals 


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<li>  In the block diagram of the receiver shown, the "limiter": 
<img src = "fmrx.gif" align = center width = 600 height = 151> 
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<li> limits the signal to a constant amplitude 

<li> rejects SSB and CW signals 

<li> limits the frequency shift of the signal 

<li> limits the phase shift of the signal 


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