Ham Radio and Antennas

Transistor adapter circuit without need for external power supply to convert Morse sound signals to switch signals for the CW-keyer input of modern ham radio transceivers.

Antenna Amplifiers 4 element yagi PA70-4-1.5B for the 4m / 70 MHz ham radio band is quick and easy to assemble and makes a good overall impression.

Go multi-band 10 to 40 meters with a fishing-rod-length vertical dipole and band-specific load coils.

Create broadband RF choke for K9YC style vertical dipole that performs well without radials.