Amateur Radio

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