Hi Steve, I am shunt feeding my 80 ft tower with a stack on top. I first tried air variables and the loading changed with power. I went to vacuum variables and all is well. 500pf @ 7.5kV. 73 Price W0RI
On Sunday, August 2, 2015 7:11 PM, Steve Flood <kk...@bresnan.net> wrote: My top-loaded vertical needs a series 260pF capacitor at the feedpoint to match the 53 + j335 impedance (1.825 MHz) to my coax feed. I have a few different air-variables I could use, but I was wondering what sort of fixed capacitors would be suitable in this application. Max power is 1500w. I have doorknob caps but they don't have current ratings marked on them. Thanks, Steve KK7UV --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband