Learning outcomes of this part
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a filter is a device that blocks some frequencies
and passes others.
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Know the effects of low pass, band pass and high pass
filters and know thier frequency/amplitude diagrams.
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low pass filter and a band pass filter can minimise
the radiation of harmonics.
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Know that too fast a rise and fall time of the transmitted
RF envelope of a CW transmitter may cause excessive bandwidth and that this
can be minimised by suitable filters in the keying stage.
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