Cool Electronics Circuits
Electronic Circuit Ideas Collection.
Saturday, April 4, 2026
Compact 40M HF Antennas: Short Dipoles & Short Verticals
Compact 40M HF Antennas: Short Dipoles & Short Verticals: Explore short dipole and vertical antennas for 40 m HF operation—ideal for limited spaces, field setups, and portable ham radio stations. 40M HF Antennas
40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation
40m Vertical Antenna: Compact Base-Loaded Design for Powerful HF Operation: Build an efficient 40m vertical antenna with a 15µH base loading coil and short radiator. Ideal for compact HF setups and portable amateur stations
Tuesday, March 24, 2026
RW4HFN Balcony Antenna for the 20-Meter Band
RW4HFN Balcony Antenna for the 20-Meter Band: Discover the RW4HFN balcony antenna design for the 20-meter amateur radio band—ideal for limited spaces. Includes schematic, dimensions, and inductance values
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