59 - Analogue Direct Conversion Receiver

Nick M0NTV builds another Direct Conversion Receiver for the 40m Amateur Band. This one has an adjustable RF Preamplifier and an analogue VFO - a Franklin Oscillator.

Have a very Happy Christmas and a peaceful New Year! Thank you very much for your support of the channel over the last 12 months. See you in 2025 for some more ham radio homebrewing adventures!

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RESOURCES
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My videos on Band Pass Filters:

16 - The Dark Art of the Band Pass Filter
   • 16 - The Dark Art of the Band Pass Filter  

37 - Building & Testing a Band Pass Filter
   • 37 - Building & Testing a Band Pass Filter  

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My videos on double-balanced diode ring mixers:

20 - Double Balanced Diode Ring Mixer
   • 20 - Double Balanced Diode Ring Mixer  

22 - Testing Times for Mixers
   • 22 - Testing Times for Mixers  

34 - Improvements to the Direct Conversion Receiver
   • 34 - Improvements to the Direct Conversion...  

42 - Mixers & Modulators
   • 42 - Mixers & Modulators  

44 - More Mixer Testing
   • 44 - More Mixer Testing  

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Wes Hayward's Variable Gain RF TIA (Termination Insensitive Amplifier)
http://w7zoi.net/tia+agc.pdf

Todd Carney K7TFC Mostly DIY RF - TIA AGC IF AMP boards & details
https://mostlydiyrf.com/tia-agc

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Charlie Morris ZL2CTM Franklin Oscillator videos:
AM Radio - Part 2a Franklin Oscillator (   • AM Radio - Part 2a Franklin Oscillator  )
AM Radio - Part 2b Buffer Amplifier (   • AM Radio - Part 2b Buffer Amplifier  )

Charlie's Notes on the Franklin Oscillator and buffer amplifier:
https://zl2ctm.blogspot.com

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Hope this helps.
Enjoy!

73, Nick M0NTV