Total posts : 45366
“i’d like someone to comment on how good or bad the design is.”
It’s a good design that will get the job done. A limited range coupler meaning it will not have much isolation capability to the 60 cycle hum unless the output tank is re-designed using a ferrite core toroid, which would also give better coupling efficiency and wider tuning range and very little inductance reaction to the constantly changing inductance of the power lines..including the neutral that carries all the return currents.
Overall, a great starter and most certainly a design that can be a base for a larger and more refined unit.
In adding to the post, the coupler I have designed uses a ferrite core toroid with several tap points connected through a 10 position wafer switch for the “line side” tuning. It is built around a 75 ohm input loading impedance for the TX, mainly the TH or similar types, but I may put a second input load selector switch and wind the primary to allow for both a 50 ohm and 75 ohm input. As is it handles about 5 watts and can couple as little as 70mW.