Hi Pete, Here is picture of coil I made to tune Inv. L at 9Y4 with 15-20 Ohm impedance. It was tuned in 2 steps:
1. calculate and wound coil to rise R close to 50 Ohm 2. adjust horizontal wire length back to desired freq. https://photos.app.goo.gl/7eVBt5t8yCAvsaZg7 Used thin wire for coil, not sure if it is right or not, used what I had there. 73 Arunas LY2ij /LY5E 2019 m. rugsėjo 1 d., 21:47 val., "N4ZR" <[email protected]> parašė: > The other day a ham friend suggested using a coil ("hairpin") to match > the low impedance of a well-radialed inverted L to 50-ohm coax. This > struck me as a potentially-attractive alternative to a series vacuum > capacitor, but I don't know enough to evaluate it. Thoughts? > > -- > > 73, Pete N4ZR _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
