Difference between revisions of "Superhet Receiver Design"

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* Couples antenna to RF Amp and suppresses out of band signals
 
* Couples antenna to RF Amp and suppresses out of band signals
 
* [[RF Band Pass Filters]]
 
* [[RF Band Pass Filters]]
 +
* [https://tools.analog.com/en/filterwizard/ Analog Devices Filter Wizard]
  
 
== RF Amp ==
 
== RF Amp ==
  
 
* [[Kits and Parts Universal Wideband Small Signal RF Amplifier]]
 
* [[Kits and Parts Universal Wideband Small Signal RF Amplifier]]
* 20dB
+
* +22dB gain
  
 
== ADE-1 Mixer ==
 
== ADE-1 Mixer ==
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* Located between First mixer and IF Amplifier
 
* Located between First mixer and IF Amplifier
 
* SSB or CW filter
 
* SSB or CW filter
** SSB4
+
** [[W7ZOI_Filters_on_Kits_and_Parts_Boards#SSB4_Crystal_Filter_on_Kits_and_Parts_Board|SSB4]]
* CW5
+
** [[W7ZOI_Filters_on_Kits_and_Parts_Boards#CW3_Crystal_Filter_on_Kits_and_Parts_Board|CW3]]
 +
** [[W7ZOI_Filters_on_Kits_and_Parts_Boards#CW5_Crystal_Filter_on_Kits_and_Parts_Board|CW5]]
  
 
== VFO/Local and BFO Oscillators ==
 
== VFO/Local and BFO Oscillators ==
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== Pre-Amp / AF Amp ==
 
== Pre-Amp / AF Amp ==
 +
 +
* [[AudioAmp380]]

Latest revision as of 00:37, 3 October 2021

Block Diagram

SuperhetBlockDiagram.png

Pre-selector / Bandpass Filter

RF Amp

ADE-1 Mixer

Crystal Filters

  • Located between First mixer and IF Amplifier
  • SSB or CW filter

VFO/Local and BFO Oscillators

  • VFO-003
    • Si5351A based
    • Arduino Pro Mini
    • OLED Display
      • Detachable for remote mounting
    • Controlled by Rotary Encoder
    • Temperature Controlled Crystal Oscillator
    • Triple output (uses 2 of the 3 outputs)
      • VFO for received frequency plus 9 MHZ

IF Amplifier

ADE-1 Mixer / Demodulator

Pre-Amp / AF Amp