Dick: Nether is correct. The correct formula is; (246 / F MHZ) x Velocity Factor = length in feet walt, W7PRB On 12/26/2015 11:38 AM, Dick Dickinson wrote: > I'm attempting to fine tune some coax lengths for phased verticals. >> In searching the internet, I find two formulas used to determine a 1/4 > wavelength of coax. >> 234 / Frequency x Velocity Factor, and > 246 / Frequency x Velocity Factor >>> What constant is correct for coax lengths? >>> 73, > Dick - KA5KKT >>>> ______________________________________________________________ > Antennas mailing list > Home: http://mailman.qth.net/mailman/listinfo/antennas > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Antennas at mailman.qth.net >> This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- ----- walt wcj9996 at frontier.com -----