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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. Please Note: In the last version of my modified FRI-Match (diagram above), I replaced the 470 pf variable capacitors with 500 pf.
1. Top switch set to the standing wave test, Connect the transceiver and antenna. 2. Transmit signal (CW or SSB), repeatedly adjust the multi switch and two knob, try one by one each combination, until the LED is darkest. 3. Top switch set to the normal, complete the tuning. Particular attention: 1. Tuning range: 40ohm - 300ohm.
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.
Shorter-than-full-sized antennas (e.g. loaded whips, dipoles, small loops) will have whackier impedances and much much narrower matching frequencies. Antenna tuner almost always needed for those….
18 kwi 2020 · Antenna tuners (more accurately referred to as “transmatches”) make great homebrew projects; they are reasonably simple to build and, when finished, provide a useful piece of equipment. Every shack should have (at least) one.
It’s an ATU, antenna tuning unit, aka coupler, matchbox, or whatever your preferred term is for an impedance matching unit. It was given to me by Graham, VK2DIG, on the condition that I work out how it works. This article describes my findings. First impressions… it’s homebrew, made evident by hand written labels on the front panel, but well
28 cze 2014 · Homebrew Antenna Tuner. Steve Yates - AA5TB. For years I've thrown together simple antenna tuners to get me on the air when needed. Whenever I would go to a sidewalk sale or hamfest I would pick up any components that might someday come in handy to make an antenna tuner.
