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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.
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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.
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
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.
Peak detector time for Power meassurement in tens ms, 60 (600ms) If you are using 1N5711 diodes in the RF detector, you can calibrate the power meassurement. Apply known 1W of power on 7MHz and change cell 8 for correct value. Apply known 10W of power on 7MHw and change cell 9 for correct value.
6 maj 2022 · QRP Guys offers some excellent antenna tuner and tuner/antenna combinations for only slightly more than those from China and the instructions are excellent. I know. I built their Digital Power/SWR Meter w/Dummy Load. https://qrpguys.com/qrpguys-power-swr-dummy-load.
Basic multi-z antenna tuner for QRP. Easy to tune low-z and high-z antennas. This is just an experiment while testing it with my 40m EFHW antenna.
