Amateur Radio

de AA1TJ 

Homebrew Projects

  • The Talking Doll; a regenerodyne receiver using vintage Germanium transistors.

  • 80m TTL Direct Conversion Receiver

  • 80m Passive Heterodyne Receiver 

  • One Transistor 80m Direct Conversion Receiver
  • 80m Transmitter With Zener Diode Exciter
  • Tunnel Diode Receiver 
  • Tunnel Diode Transmitter 
  • Parametric Regenerative Receivers  
  • 80m 1955 "Retro" QRP Transmitter
  • 40m 1964 "Retro" QRP transmitter
  • The Vermont Snowflake; an 80m QRPp Transmitter
  • 40m DCR with "Polyakov" Sub-Harmonic Mixer; note; 2SB54 Germaniums & 3.5MHz osc.
  • 40m Wheatstone Bridge 0-V-0 Regenerative Receiver
  • 40m Cross-Coupled Regenerative Receiver
  • QRPp In-Line Directional Wattmeter 
  • My Antenna System
  • Underground Radio Shack

Information 

  • Tunnel Diode Spice Models 
  • Tunnel Diode Converter Circuits; Article by Erich Gottlieb 
  • Tunnel Diode Oscillators; From the GE Transistor Manual, 7th Edition, 1964 
  • Tunnel Diode AM/FM Phone Transmitters; Settimana Elettronica, 1962, Italian text
  • Realistic DX120 "Star Patrol" Schematic Diagram; My Novice receiver

 

 Links 

  • VK2ZAY; My Australian Doppelgänger 
  • Mr. Rick's Tunnel Diode Page; Collection of vintage tunnel diode information
  • Micro-TO Keyer; My own Micro-TO uses uL923's and diode "MML" in place of the uL914 

 

Pelleter des Nuages

  • Electromechanical RF Transmitter


Home