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T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
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T 05 radio recivers

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Transcript

  • 1.  RX Power Reception Selection Demodulation Reproduction
  • 2.  Types  CW  AM (SSB)  FM Crystal Tuned Radio Receiver Superhet
  • 3.  Functions  Reception  Selection  Demodulation  Reproduction
  • 4.  Inverse square law
  • 5.  Aerial / antenna Polarisation Direction  Yagi array
  • 6.  Sensitivity  Weak signal  noise Selectivity  Band width filter  1% of RX Frequency Stability
  • 7.  Crystal radio  AM (not CW, SSB or FM)  Poor sensitivity and selectivity
  • 8.  Tuned radio  Improves selectivity and sensitivity  Amplifiers (difficult to stabilise)
  • 9.  Superheterodyne  Best selectivity, sensitivity and stability (tuned oscillator) ▪ CW, AM, SSB, FM
  • 10.  1st stage  Buffer  Amplifier  Filter
  • 11.  Mixer  Intermediate Frequency  Smaller band width (5 kHz) – receiver bandwidth  Local oscillator – controls reception frequency fs – fo = fif fs + fo = fif
  • 12.  Image frequencies  two frequencies can produce the same IF
  • 13.  CW and SSB AM FM
  • 14.  Beat Frequency Oscillator  Mixes with IF to produce an audio tone  |fif – fbf |= Beat Frequency  fif + fbf remove using a filter  Used in SSB and CW (no carrier wave)  Change crystal to change sideband
  • 15.  AM RX Detector  Envelope detector  Product detector
  • 16.  Envelope detector
  • 17.  Envelope detector circuit
  • 18.  Product detector Works for AM and SSB fif . flo Filter result
  • 19.  FM RX  Quadrature detector ▪ Multiply with signal phase shifted 90o  Phase Lock Loop (PLL) ▪ Error signal  Digital Signal Processor
  • 20.  FM RX  Foster-Seeley Discriminator ▪ Frequency control using a centre tapped transformer ▪ Ratio detector
  • 21.  Low Frequency amplifier

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