NZART Amateur Examination &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp page 10&nbsp &nbsp &nbsp &nbsp &nbsp NZARTX07 Security code 268509
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<br>

<li>  A neighbour's stereo system is suffering RF 
break-through. One possible 
cure is to: 

<ol type = a>

<li> put a ferrite bead on the transmitter output lead 

<li> put a capacitor across the transmitter output 

<li> use open-wire feeders to the antenna 

<li> use screened wire for the loudspeaker leads 


</ol>
<br>

<li>  A band-pass filter will: 

<ol type = a>

<li> pass frequencies each side of a band 

<li> attenuate low frequencies but not high frequencies 

<li> attenuate frequencies each side of a band 

<li> attenuate high frequencies but not low frequencies 


</ol>
<br>

<li>  An active audio low-pass filter could be constructed 
using: 

<ol type = a>

<li> zener diodes and resistors 

<li> electrolytic capacitors and resistors 

<li> an operational amplifier, resistors and capacitors 

<li> a transformer and capacitors 


</ol>
<br>

<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 


</ol>
</ol>