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Friday 30 October 2015

Make a wideband antenna matching transformer

Most do-it yourself TV antenna projects online use a ready made impedance matching transformer between antenna and cable. But what can you do if you can't find one at your local supplier? This post will show you how can you make one. You could use some hard to find double hole pig-nose RF ferrite cores, but this transformer has good performance even with ordinary toroidal cores.

This transformer can be used for VHF and UHF reception (from 50 to about 800 MHz). The input is 300 ohms balanced and the output is 75 ohms unbalanced, ready for coaxial cable connection. A device similar to what is presented here is used in commercially available antenna preamplifiers with 300 ohms input.

Make a wideband antenna matching transformer
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