Is that the book written by Bill Pasternak, WA6ITF and Mike Morris, WA6ILQ?
Neil - WA6KLA Steve wrote: > > 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 Repeater-Builder@yahoogroups.com, 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 > > > > 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/
