NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 10&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 267036
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<li>  On an amateur receiver, unwanted signals are found at 
every 15.625 kHz. 
This is probably due to: 

<ol type = a>

<li> a low-frequency government station 

<li> a remote radar station 

<li> radiation from a nearby TV line oscillator 

<li> none of these 


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<li>  A band-stop filter will: 

<ol type = a>

<li> pass frequencies each side of a band 

<li> stop frequencies each side of a band 

<li> only allow one spot frequency through 

<li> pass frequencies below 100 MHz 


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<li>  A high-pass filter can be used to: 

<ol type = a>

<li> prevent interference to a telephone 

<li> prevent overmodulation in a transmitter 

<li> prevent interference to a TV receiver 

<li> pass a band of speech frequencies in a modulator 


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<li>  "ITA2" is: 

<ol type = a>

<li> a 5 bit alphabet used for digital communications 

<li> Morse code sent such that the baud speed is equal to 
the dot speed 

<li> a coding system identifying modulation types 

<li> an error correction code 


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</ol>