A twin delta antenna is a compact full-wave loop antenna designed for the 2-meter amateur radio band. Each triangular loop has sides of approximately 70 cm, 67 cm, and 67 cm, giving a loop circumference of about 204 cm. Since the wavelength at 146 MHz is approximately 205.5 cm, the antenna resonates very close to the center of the 2-meter band. The antenna is fed with 50-ohm coaxial cable at the center feedpoint, providing efficient power transfer for transmitting and receiving VHF signals. A 1:1 current balun (common-mode choke) at the feedpoint may be useful to reduce common-mode currents on the coax and improve radiation symmetry. Fine-tuning the dimensions can help achieve the lowest SWR after construction. #TwinDeltaAntenna #HamRadio #ElectronicsEducation #AmateurRadio #ElectronicsRD

Sights & Sounds 🖼️ This massive tower belonged to Finland Radio Arcala, OH8X, and it was designed by a professional engineering group that designs bridges. 👉The 330-foot tower weighed 40 tons and was fully rotatable, thanks to a large motor of the type used for turning cargo ship propellers. The guy wires were three levels of large slip-ring bearings. In addition to two M2 full-size beams for 40 meters, the tower had a three-element antenna for 160 meters and a five-element antenna for 80 meters. In November 2019, a severe ice storm brought the tower down 🧊 #hamradio #amateurradio

📡 ARRL Field Day is almost here! ⛺Each year, thousands of amateur radio operators across the U.S. and Canada head outdoors to make contacts, test equipment, and practice emergency communications. 🌎 Part contest. Part campout. Part emergency preparedness exercise. Will you be participating this year? 👇 🔗 https://www.arrl.org/field-day #arrlfield #hamradio #amateurradio #portableradio #RETEVISAilunce #twowayradio #outdoors #edc #EDC #fieldday #outdoors