DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Explore dedicated 40M band projects and technical guides at vu3dxr.in. This tag features amateur radio content focused on the 7 MHz frequency, including antenna designs, transceiver modifications, and propagation tips. Discover practical DIY solutions to enhance your performance on one of the most popular ham radio bands.
Full-size Delta Loops for the 40-meter band normally require around 42 meters of wire—often impossible for operators with limited space. To overcome this challenge, Andy (2E1TAP) documented his attempt at constructing a space-efficient, shortened 40-meter Delta Loop.
Build a simple 40 m CW transmitter using a 2N2222 and 7 MHz crystal oscillator — a minimalist QRP design with keyed oscillator and low-pass filter for clean HF Morse transmission.