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I decided to build a homebrew antenna tuner because I needed a passive pre-selector network to match an experimental end-fed wire antenna to my QS1R SDR receiver.
18 kwi 2020 · A well-designed Z-match tuner has a high Q and is more efficient (less lossy) than other types of tuners. The fixed inductor simplifies construction (no taps or rollers needed). Using a toroid inductor and some small poly-film variable capacitors, the Z-match can be built into a very compact package.
mAT-40 Automatic antenna tuner, weatherproof, for placement directly at the feed point of a long-wire antenna. Doublet antenna. The doublet antenna is a symmetrical open dipole antenna fed by a symmetrical feed line. These antennas come in all shapes and sizes and are widely used.
This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24).
BUILD AN HF ANTENNA TUNER MAKE A HOMEBREW HF-VHF ANTENNA TUNER (It really isn't all that difficult.) This page details several T-match tuners. By comparing them, you should be able to construct a tuner to your own particular requirements.
A simple "L" network (with the antenna attached to the capacitor side) provides a good match for a high-impedance load, such as a half-wavelength wire. A series L-C circuit can be used to match a low-impedance load, as presented by a quarter-wave wire.
Matches balanced loads without the use of lossy baluns. Being a parallel resonant circuit, the Z-match can provide some band-pass filtering for your receiver and harmonic attenuation for your transmitter. A well-designed Z-match tuner has a high Q and is more efficient (less lossy) than other types of tuners.
