A switchable Magnetic Transformer for Transmitting for various impedances
Antenna modeling discussions about What happens if… a dipole is bent horizontally, laterally, vertically. Zig-zag, meander, catenary curve. Effect of sag, elevation, radials. OCF off-center feed, harmonics. Includes 4NEC2 antenna models for each study.
A simple UHF Crystal Radio wired up to check for reception of VHF/UHF signals in the vicinity of the shack.
The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres
The details of the spark gap transmitter and its history: how it was invented, developed and used.
A 500 kHz to 5.5GHz 2-port vector network analyzer designed for use with any Linux, Windows or MacOS computer. High performance: up to 80 dB dynamic range in the MHz range; up to 40 dB in the GHz range
An interesting article dedicated to hams that want to start learning morse code, including notes on Methodology, online training tools, and a guide to Morse Keys
Ham radio information for new CW and QRP operators. Includes operating advice, reviews and articles on kit building/rig repair,
iota mapping project – a mapping resource for the IOTA (Islands On The Air) award program
Test equipment and ham radio related manuals
Switchable MTFT for Wire-Antennas, Bent Dipoles reference website, UHF Crystal Radio, How to make a HB9CV , Spark Gap Transmitter, pocketVNA – portable Vector Network Analyzer, Learn Morse Code, Ham Radio – QRP, iotamaps – IOTA mapping project, KO4BB’s Manual Repository,