Nope...I dug up my copy of "FM and Repeaters for the Radio Amateur" (from where this plan came from)...it says "Lengths E and F are each 63.8 inches long from center of T to center of T".
The only thing I can imagine was that maybe someone was dyslexic and it's supposed to be 68.3" rather than 63.8"...that would put it close to 145 Mhz... Steve, KE4MOB --- In [email protected], Paul Guello <[EMAIL PROTECTED]> wrote: > 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/
