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Bredhurst Receiving and Transmitting Society

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Part 3


Learning outcomes of this part

  • a filter is a device that blocks some frequencies and passes others.

  • Know the effects of low pass, band pass and high pass filters and know thier frequency/amplitude diagrams.

  • low pass filter and a band pass filter can minimise the radiation of harmonics.

  • 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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