At 02:27 PM 9/28/04, Steve wrote:
>I'm thinking about building this: > >http://www.repeater-builder.com/rbtip/exposeddipole.html > >However, I'm having trouble reproducing the calculation that yields a >63.8 inch coax length. I'm assuming the velocity factor is .67 and >keep getting 68 inches for a 5/4 wave...off from 63.8 inches as in >the article. I can reproduce the 40.8 inch dimension (3/4 wave) >within a fraction of an inch.... > >I'm using L = 246/F*Vf for a quarter wavelength (about 13.5 inches). > >What am I missing? I'd like to understand where the numbers come >from before I start cutting aluminum and coax.... I don't know where the numbers come from either. The VF of solid PE coax is .66, not .67, but that's not much error. At 146Mhz, I get 40.04" and 66.74". Roger Grady K9OPO Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
