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18 kwi 2020 · 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. The fixed inductor simplifies construction (no taps or rollers needed).
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The QRP Manual Tuner appears to be the combination a few pieces of work, some that are possible to locate on the Internet. SWR Indicator Circuit - Dan Tayloe N7VE LED SWR indicator
A Credit Card sized HF T-MATCH ANTENNA TUNER for QRPp and QRP Portable Operations. Lately I am fascinated with miniscule RF power HF rigs and their performance on Digital Modes such as FT-8 and FT4.
1 paź 2021 · David N7DDC has released a new version of his ATU-100 as a low-power consumption and 10 W QRP version of his popular autotuner. The design is focused on low power consumption during operation. Latching relay are used make this happen.
A simple QRP multi-z antenna tuner. Easy to tune low-z and high-z antennas. Still not sure about how well it performs. Hopefully it will do ok for 80m, 40m and 20m band. I just got a nanoVNA so I will experiment with the number of turns on the inductor and the values of the capacitor.
4 gru 2017 · RFSim99 is an old but still very useful piece of free software for designing and simulating RF circuits such as filters, attenuators, matching circuits, RF components with S-parameters and so on. It is not a high end tool, but is more than good enough for hobbyist and ham level designs.
While I haven't tested this little tuner on every band with every conceivable load, it has performed well for me on 30 and 40 meters, the bands I use most often in the field. It should do a respectable job on just about any random wire antenna.
