This is a 200 Watt PEP transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP upgrade of the originaly Par Electronics designed 25 Watt HF endfedz multiband end fed. The coil has a total of 16 turns . For max. performance the 2 turns to ground must be twisted . The 100-150pF capacitor gives a better match on 10m.and both windings start at the ground side of the coil .Don't try to stack toroids for more power for this will increase overall inductance . This makes it impossible to tune the high bands. The best results are obtained with a small toroid..... The 3 band antenna has a length of 10.1m. followed by a coil of about 34 uH ( 90 turns 1mm enamel wire on a 19mm pvc tube ) and a endpiece of 1.85m , offering you a perfect vertical or horizontal antenna for fieldwork at 40 -20 and 10m. There is also a 5 band version with 20.35m wire followed by a 110 - 120uH coil ( about 260 turns 1 mm cul on a 19mm pvc tube ) and a 2.39m. endpiece. This antenna works on 80 - 40 - 20 -15 and 10m.without radials and has a verry low swr combined with a low noise level. Keep in mind that every end fed / vertical needs some kind of counterpoise to pusch against and in this case that's the coax , so don't forget a line choke near to your transceiver.
Transformer made by Tony PA3GWO on a smaller FT140-43 toroid for max. 100 Watt pep