First is the completed transformer, still in the vise, next to an empty core. The transformer is wound on an Amidon FT-50A-77 core, with 30 turns on the antenna side and 10 turns on the reciever side. I wanted the antenna to have a DC ground, and a long-wire is inherently unbalanced anyway. ![]() Mine is an Unun because both windings have a ground connection. ![]() The antenna literature says long wires are 400 to 600 ohms, and the low impedance input is designed for about 50 ohms. Reading all the antenna website info made me decide I should try a matching transformer between my long wire and my RX320, which has a low impedance input. There's a description of the installation on my new Wire Antennas page.Īntenna Impedance Matching Transformers (Balun, Unun) ![]() In November, 2000 I put up a 350-foot long piece of wire that runs straight west out of my basement radio room, about 5 feet high thru bushes and trees out into the woods next to the house. Antenna Transformer Construction and Testing Doug's Antenna Transformer PageĪntenna Transformer Construction and Testing
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