The New Encyclopaedia Britannica: A - K.Encyclopaedia Britannica, 1997 |
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Page 226
... Frequency frequency ( symbolized as ƒ ) in cycles per second , and the time taken to complete one cycle is 1 / f seconds , sometimes called the period . To commemorate the German pioneer Heinrich Hertz , who carried out some of the ...
... Frequency frequency ( symbolized as ƒ ) in cycles per second , and the time taken to complete one cycle is 1 / f seconds , sometimes called the period . To commemorate the German pioneer Heinrich Hertz , who carried out some of the ...
Page 227
... Frequency Spectrum very low frequencies ( vlf ) low frequencies ( lf ) medium frequencies ( mf ) 30 kHz 300 kHz 3 MHz high frequencies ( hf ) 30 MHz very high frequencies ( vhf ) ultrahigh frequencies ( uhf ) superhigh frequencies ( shf ) ...
... Frequency Spectrum very low frequencies ( vlf ) low frequencies ( lf ) medium frequencies ( mf ) 30 kHz 300 kHz 3 MHz high frequencies ( hf ) 30 MHz very high frequencies ( vhf ) ultrahigh frequencies ( uhf ) superhigh frequencies ( shf ) ...
Page 230
... frequency is mixed ( heterodyned ) with the output of an oscillator the frequency of which is adjusted so that the difference be- tween it and the incoming signal is constant ; the result is the intermediate frequency . Amplification is ...
... frequency is mixed ( heterodyned ) with the output of an oscillator the frequency of which is adjusted so that the difference be- tween it and the incoming signal is constant ; the result is the intermediate frequency . Amplification is ...
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