Hans Gatu SA7AUY had a very cool idea for a selfmade variable power capacitor. It has about 300pf, but as you will agree, there is no limit for higher values.The material will surely agree every flash over!
See self: http://www.heathkit.nu/heathkit_nu_AMU.html 55 Lup, DJ7SW Am 13.10.2011 13:05, schrieb Gary Smith: > I used to use an ugly, beat up 500pf vac variable at the base of my > 160M inv-L& used the MFJ SWR Analyzer to adjust it. The CAT-5 cable > I used for wire was brought up over a tall tree and chafing from the > wind blown branches wore through it 1/2 times a year. After the > antenna came down the last time I used a more rugged wire and cut it > 135' long and have it connected to a radial plate which serves as a > common tie-in for my separate 160, 80, 40, 30 meter vertical wires > but also my butternut HF9V which I use for 20& up. > > The 160M ant will not cover the whole band but as I rarely go above > 1.9 Mhz, it's perfect and needs no base loaded cap. > > YMMV. > > 73, > > Gary, KA1J > >> I plan on adding an Inverted L soon, and have seen a few websites that >> recommend about 1000pF at the base to tune it. What voltage cap should I be >> looking for if I am going to run about 600W? >> >> -- >> *Clint Talmadge - W5CPT - * >> _______________________________________________ >> UR RST IS ... ... ..9 QSB QSB - hw? BK >> > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
