NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 5&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 270029
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<li>  In the block diagram shown, the "SWR bridge" is a: 
<img src = "hfsta.gif" align = center width = 600 height = 
170> 
<totallines = 16 >

<ol type = a>

<li> switched wave rectifier for monitoring power output 

<li> static wave reducer to minimize static electricity from the 
antenna 

<li> device to monitor the standing-wave-ratio on the antenna 
feedline 

<li> short wave rectifier to protect against lightning strikes 


</ol>
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<li>  In the block diagram of the receiver shown, the "mixer": 
<img src = "ssbrx.gif" align = center width = 600 height = 
161> 
<totallines = 15>

<ol type = a>

<li> combines signals at two different frequencies to produce 
one at an intermediate 
frequency 

<li> combines sidebands to produce a stronger signal 

<li> discriminates against SSB and AM signals 

<li> inserts a carrier wave to produce a true FM signal 


</ol>
<br>

<li>  In the block diagram of the receiver shown, an automatic 
gain 
control (AGC) circuit would be associated with the: 
<img src = "fmrx.gif" align = center width = 600 height = 151> 
<totallines = 16> 

<ol type = a>

<li> mixer 

<li> IF amplifier 

<li> limiter 

<li> frequency demodulator 


</ol>
</ol>
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