Pictured below is my Single Coil Toroidal Z-Match which follows a design by Lloyd Butler VK5BR .
This uses a T200-2 toroidal core and a couple of receiver type variable capacitors which allow a max input power of about 50 watts CW . This depends on the aerial in use i.e. short doublets may cause problems on lower bands but I used a 50ft doublet on 80m with no problems.
The clear lid is due to the capacitor vanes not clearing the box lid :-) looks quite nice...
Vernier drives are cool but hard to get at the right price these days. Got these at Maplins years ago.
|Single coil toroidal Z-match (QRP)|