Johnson's Techworld

WSJT and WSJT-X WSJT stands for Weak Signal communication by K1JT, a computer program for amateur radio communication released in 2001. WSJT-X is an extended version with contribution

Inverted L Multi-Band Antennas There are several versions of multi-band inverted L antennas out there. I thought of describing a center fed one and an end fed one.

Transequatorial Radio Propagation Transequatorial VHF propagation was first noted by radio amateurs in August 1947 when Mexican stations could work Argentine stations regularly across the equator in the

What is Troposcatter Propagation? Tropospheric Scatter Propagation is known in short as Troposcatter Propagation. Troposphere is the lowest layer of the atmosphere. Though Troposcatter is typical at microwave

USB Cable Opened Up! This USB or Universal Serial Bus cable was opened up for a purpose. First I wanted to demonstrate the wires going into the USB

What is a Gamma Match for the Antenna? Gamma impedance match for the antenna is also known simply as gamma match. In case of a Yagi-Uda type of

See Inside of a Breadboard Power Supply This breadboard power supply works on 5 V DC. Two levels of output at 5 V and 3.3 V are available.

Full Wave Loop Antenna Full wave loop antenna is also known as self-resonant loop antenna and large loop antenna. Other loop antennas are halo antenna and small loop

What is a Beverage Antenna? Beverage antenna, also known as wave antenna, is a long wire receiving antenna invented by Harold H. Beverage in 1921, the name being

What is APRS in Amateur Radio? APRS stands for Automatic Packet Reporting System, invented by WB4APR in 1992. APRS serves as a digital communications information channel for Ham