Steve, If you use .66 for the velocity factor of RG-11 and 147 MHz then it comes out to 66.25" which is within 2.5" of the text. I've found that on these harnesses, the length is so critical that the connectors must also be included in the total. I'd bet that this accounts for the difference in the calculation. The length shown in the article assumes the additional length of the connectors. Paul, KB9WLC
--- Steve <[EMAIL PROTECTED]> 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.... > > Steve, KE4MOB > > > > > > > Yahoo! Groups Links > > > [EMAIL PROTECTED] > > > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/
