1500 Watt GS35B Six Meter Amplifier
Low cost Russian triode design with complete schematic and documentation package.

 
1.8 to 54 MHz 1500 Watt Low Pass Filter
Low cost-high performance filter you make at home. Easy to make with hardware store parts. Uses home made Teflon™ capacitors. Includes detailed mechanical drawing and design software details. 

High Voltage Breakdown Tester
Necessary test equipment for amplifier builders. Tests tubes, vacuum relays, vacuum or  plate blocking caps, and more. Simple circuit. Schematic shows low cost parts options.

LCD Touch Screen Antenna Rotor Control
Unique universal rotor control. Works for any rotor with high speed motor shaft access; prop pitch, commercial, or custom made.

Practical Hints & Suggestions for Z3801A GPS Frequency Standard
Just about everything you want to know about the HP Z3801A GPS Receiver.

Two Antenna Stack Match
Provides low SWR when two Yagi antennas are stacked. Mounts on tower with control box located in shack. Flexible Yagi selection.   

Morse Code Keyboard with Bug Emulation
Sends both perfect code and the old-time "bug" sound. Fun to use.

 
HF 10-30 MHz Log Periodic Antennas
Detailed electrical and mechanical design package for HF 10-30 MHz log periodic antennas. Rugged construction, high performance.
Download free ARRL mechanical design software

 
Easy Custom Panel Meter Faces at Home
Design custom meter plates on your PC and print to your printer.

Vacuum Tube Liquid Cooling System

Measure Resistor Noise with the J-Can

Build the N2PK Vector Network Analyzer