Rothammels Antenna Book – Translated and revised from the 13th German edition
Rothammels Antenna Book For many years, radio amateurs have been using this reference book, which has acquired a firm place…
Month: February 2022
1:49 UNUN using two stacked FT240-43 cores for endfed halfwave antenna
1:49 UNUN using two stacked FT240-43 cores for end fed halfwave antenna In order to match the end fed half…
Ten Minute QRP Transmitter
Ten Minute QRP Transmitter This is a simple crystal-controlled CW (Continuous Wave) QRP Transmitter circuit designed for amateur radio use,…
Circuits – Sovina2 40M Class E Transmitter
This is a Class E Transmitter designed for the 40-meter amateur radio band, capable of producing approximately 4.6W output power…
G4RAW 80M QRP TAG CW Transmitter
G4RAW 80M QRP CW Transmitter: The original version was built on tag strip, hence the name. For PA, we can…
VK4FUQ Optimized sloper antenna for 3.5Mhz
VK4FUQ’s optimised sloper antenna for 3.5MHz. Radiator and counterpoise radial are both one-quarter-wave in length (length in metres = 71.37/(frequency…