   RX   Power   Reception   Selection   Demodulation   Reproduction
   Types     CW     AM (SSB)     FM   Crystal   Tuned Radio Receiver   Superhet
   Functions     Reception     Selection     Demodulation     Reproduction
   Inverse square law
   Aerial / antenna   Polarisation   Direction     Yagi array
   Sensitivity     Weak signal     noise   Selectivity     Band width filter     1% of RX Frequency   Stability
   Crystal radio     AM (not CW, SSB or FM)     Poor sensitivity and selectivity
   Tuned radio     Improves selectivity and sensitivity     Amplifiers (difficult to stabilise)
   Superheterodyne     Best selectivity, sensitivity and stability (tuned      oscillator)      ▪ CW, AM, SSB, FM
 1st stage   Buffer   Amplifier   Filter
   Mixer     Intermediate Frequency     Smaller band width (5 kHz) – receiver bandwidth     Local oscillator – control...
   Image frequencies     two frequencies can produce the same IF
   CW and SSB   AM   FM
   Beat Frequency Oscillator     Mixes with IF to produce an audio tone     |fif – fbf |= Beat Frequency     fif + fbf...
   AM RX   Detector     Envelope detector     Product detector
   Envelope detector
   Envelope detector circuit
   Product detector   Works for AM and SSB   fif . flo   Filter result
   FM RX     Quadrature detector      ▪ Multiply with signal phase shifted 90o     Phase Lock Loop (PLL)      ▪ Error s...
   FM RX     Foster-Seeley Discriminator      ▪ Frequency control using a centre tapped transformer      ▪ Ratio detector
   Low Frequency amplifier
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
T 05 radio recivers
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T 05 radio recivers

  1. 1.  RX Power Reception Selection Demodulation Reproduction
  2. 2.  Types  CW  AM (SSB)  FM Crystal Tuned Radio Receiver Superhet
  3. 3.  Functions  Reception  Selection  Demodulation  Reproduction
  4. 4.  Inverse square law
  5. 5.  Aerial / antenna Polarisation Direction  Yagi array
  6. 6.  Sensitivity  Weak signal  noise Selectivity  Band width filter  1% of RX Frequency Stability
  7. 7.  Crystal radio  AM (not CW, SSB or FM)  Poor sensitivity and selectivity
  8. 8.  Tuned radio  Improves selectivity and sensitivity  Amplifiers (difficult to stabilise)
  9. 9.  Superheterodyne  Best selectivity, sensitivity and stability (tuned oscillator) ▪ CW, AM, SSB, FM
  10. 10.  1st stage  Buffer  Amplifier  Filter
  11. 11.  Mixer  Intermediate Frequency  Smaller band width (5 kHz) – receiver bandwidth  Local oscillator – controls reception frequency fs – fo = fif fs + fo = fif
  12. 12.  Image frequencies  two frequencies can produce the same IF
  13. 13.  CW and SSB AM FM
  14. 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. 15.  AM RX Detector  Envelope detector  Product detector
  16. 16.  Envelope detector
  17. 17.  Envelope detector circuit
  18. 18.  Product detector Works for AM and SSB fif . flo Filter result
  19. 19.  FM RX  Quadrature detector ▪ Multiply with signal phase shifted 90o  Phase Lock Loop (PLL) ▪ Error signal  Digital Signal Processor
  20. 20.  FM RX  Foster-Seeley Discriminator ▪ Frequency control using a centre tapped transformer ▪ Ratio detector
  21. 21.  Low Frequency amplifier
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