NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 7&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 270029
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<br>

<li>  To obtain high frequency stability in a transmitter, the 
VFO should be: 

<ol type = a>

<li> run from a non-regulated AC supply 

<li> in a plastic box 

<li> powered from a regulated DC supply 

<li> able to change frequency with temperature 


</ol>
<br>

<li>  A harmonic of a signal transmitted at 3525 kHz would be 
expected to occur 
at: 

<ol type = a>

<li> 3573 kHz 

<li> 7050 kHz 

<li> 14025 kHz 

<li> 21050 kHz 


</ol>
<br>

<li>  Parasitic oscillations tend to occur in: 

<ol type = a>

<li> high voltage rectifiers 

<li> high gain amplifier stages 

<li> antenna matching circuits 

<li> SWR bridges 


</ol>
<br>

<li>  The capacitor value best suited for filtering the output of 
a 12 volt 1 amp 
DC power supply is: 

<ol type = a>

<li> 100 pF 

<li> 10 nF 

<li> 100 nF 

<li> 10,000 uF 


</ol>
<br>

<li>  The block marked 'Regulator' in the diagram is to: 
<img src = "regps.gif" align = center width = 511 height = 
129> 
<totallines = 13 >

<ol type = a>

<li> regulate the incoming mains voltage to a constant value 

<li> ensure that the output voltage never exceeds a 
dangerous value 

<li> keep the incoming frequency constant at 50 Hz 

<li> keep the output voltage at a constant value 


</ol>
<br>

<li>  The correct phonetic code for the callsign VK5ZX is: 

<ol type = a>

<li> victor kilowatt five zulu xray 

<li> victor kilo five zulu xray 

<li> victor kilo five zanzibar xray 

<li> victoria kilo five zulu xray 


</ol>
</ol>
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