The Morgain 40/80-Meter Antenna for Limited Space Installations
Description
This resource details the construction and testing of a shortened Morgain dual-band wire antenna for 40 and 80 meters, designed for installations with limited space. The article, written by Remo - IM0JZJ, describes an alternative configuration that reduces the physical length of the antenna while maintaining its electrical design. It covers the author's testing process, including SWR measurements: 1.2:1 to 1.4:1 on 40 meters, and 1.1:1 to 1.5:1 on 80 meters (specifically 3620 kHz to 3720 kHz). The antenna has a feed-point impedance of approximately 50 ohms and requires a 1:1 current balun when fed with coaxial cable. The installation setup involved two 11.50-meter galvanized steel poles, supporting the antenna approximately 10 meters above ground. The completed antenna occupies about 10 x 0.5 meters and uses 64 meters of 1.5 mm2 insulated electrical wire. Tests were conducted from Sant'Antioco, southwest of Sardinia.