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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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I can tune up to 5 watts with this tuner though my aim was more in QRPp zone which is sub 1 watt! Though I successfully used it with my ADX,QDX and QMX without any issues by keeping tuning TX times under 10 seconds at a time not to heat up excessively. Then it works like a champ! 😊
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
New in FW version 1.6. 1 - New better meassurement formula for Power and SWR calculation, compensation and calibration. 2 - Setting by Cells control implementation. There are 10 cells you can find opening a FW .hex file in Notepad++ program as Intel HEX file.
The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power). It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops).
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.
The ZM-2 ATU is a simple manual antenna tuner that you can purchase either as a fun-to-build kit or fully assembled and tested. I’ve owned my ZM-2 for many years, and I believe every QRP field operator should have one. They do a brilliant job of matching random wire antennas and taking your resonant antenna to a non-resonant band.
