RA9SUS Simple Loop Antenna covering 14–30 MHz
The RA9SUS simple loop is a compact HF antenna covering 14–30 MHz using a 4.7…
Antenna
DIY
HF
Antenna
DIY
HF
Building a Andy 2E1TAP’s Shortened 40-Meter Delta Loop
Full-size Delta Loops for the 40-meter band normally require around 42 meters of wire—often impossible…
Antenna
DIY
HF
radio
Shortened Vertical Antenna for the 80-Meter Band (UR0GT Design)
Compact 4 m shortened vertical antenna for the 80 m band using a 64 µH…
Articles
HF
News
radio
Nextion Emulator for CEC Firmware — Alpha1 Release Brings uBITX Simulation to Desktop
The Alpha 1 release of the Nextion Emulator for CEC firmware — a Python-based emulator…
Circuits
DIY
VHF/UHF
Dual-Band RW4HFN Antenna for 145/430 MHz bands
Compact dual-band RW4HFN antenna covering 145 MHz (2 m) and 430 MHz (70 cm) with…
Articles
News
OpenSourceSDRLab PortaRF: The Next Evolution in Portable Software-Defined Radio
PortaRF is a compact all-in-one portable SDR combining HackRF-class wideband RF (≈1 MHz–6 GHz) with…
Articles
HF
News
LARCSet kit – Most Affordable SSB/CW Transceiver Kit Released
LARCSet is a $39 open-source 40 m SSB/CW transceiver kit from HF Signals delivering 5…
Antenna
DIY
Reception
VHF/UHF
A Broadband Butterfly Antenna for VHF and UHF
The broadband butterfly (bi-square) antenna uses two connected square loops to deliver stable 50–75 Ω…
Antenna
DIY
HF
Tools
DIY Wideband CMC Choke Using Steel Wool and RG-213 – A Simple Common-Mode Filter
Common-mode currents are a well-known enemy of clean RF communication. When RF travels along the…