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Next I had to find two dual-section air variable capacitors. Furthermore, I wanted the tuner to help me experiment with my many oddball home-brewed HF antennas! I intended to design my homebrew antenna tuner to suit my specific antenna system situation, instead of using a more "universal" design which is a "one-size-fits-all" device normally intended to be useful in "most" circumstances, but generally only with reasonably well-designed HF antennas. The drawback was that their higher "Q" meant that one could not deal with as large a range of antenna system impedances and operating frequencies as one can with a T-network. I learned that, much like L-networks, the efficiency of link-coupled networks was much greater than the popular T-networks. While reading the many articles that were published on the Web and amateur radio books, I was discovering that they had a lower parts count and, in some instances, were less complex to build while remaining capable of transforming a fair range of impedances down/up to 50 ohms - which is the nominal input/output impedance of HF transceivers and amplifiers. Link-coupled network: this is where things got interesting. I published a short summary of my preliminary findings on tuners in my ebook on HF antenna accessories (see ref.1 below). I studied the most popular antenna tuner networks in search of the best set of compromises for my purposes. And sacrificing as little as possible in performance!.I also wanted the tuner to be easily reproducible. Specifically, I was hoping that my homebrew antenna tuner would improve my signal to noise ratio on the aforementioned bands.
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My goal was to see if I could improve reception on the lower frequency amateur radio bands such as on 160 meters (1.8-2.0 MHz), 80 meters (3.5-4.0 MHz) and 40 meters (7.0 - 7.3 MHz). Below is the network design that I settled on for my first attempt.
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The QS1R SDR receiver probably does not need this much pampering to perform exceptionally well, but I was curious nonetheless. Best Of Breed The Z-Match The FRI-Match My Experiment A Tuning Indicator Transmatch Explained T vs L-Networks T-Networks L-Networks References