Cool Electronics Circuits
Electronic Circuit Ideas Collection.
Wednesday, March 4, 2026
FT2 Digital Mode: Latest News, Software Updates, and Ham Radio Adoption
FT2 Digital Mode: Latest News, Software Updates, and Ham Radio Adoption: FT2 is the fastest FT-family digital mode ever built — completing QSO in seconds. Discover its origins, Decodium vs WSJT-X Improved schism, adoption trends,
Tuesday, March 3, 2026
Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials
Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials: A complete technical guide to DIY ladder line for amateur radio. Build 450–600 ohm open-wire feedline cheaply, with less loss than coax on any HF band.
Shortened Inverted V Antenna for 80 Meters (3.700 MHz)
Shortened Inverted V Antenna for 80 Meters (3.700 MHz): Operating on the 80-meter band can be challenging for radio amateurs with limited horizontal space. A full-length 80-meter dipole requires nearly 40 meters of wire, which is often impossible to install in urban or restricted locations. To solve this, PY7DM Arimatea designed an efficient Shortened Inverted V Antenna for 3.700 MHz, using loading coils and precise wire lengths to compress the antenna into a compact, manageable size without sacrificing performance on the lower HF bands.
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