The bottom and top elements are 1/4 wave in coax. The quarter wave stub and top radiating element measure a quarter wave in air. The quarter wave stub, which is just a piece of solid wire, connects from the bottom of the lower quarter wave coaxial element (shield) to the shield of the 50 ohm feedline.
Regards, Joe At 05:07 AM 5/1/2004, you wrote: >Hi Joe > >Using hobby brass as you have . > >I have not tried the 1/4 wave stub as of yet.Read >Kevins article-before. > >All these designs seem to backed up for a VSWR and >that is why my question-low imp feed with first >element 1/4 or first element 1/2 wave. > >Thanks Brad >--- Joe <[EMAIL PROTECTED]> wrote: > > How many elements in your antenna? I found at least > > 8 elements are needed > > before > > the SWR is low. I used a 1/4 wave stub instead of > > the open balun seen on > > some designs and hobby brass to construct the > > elements. I found brass > > easier to > > use than coax for UHF. Check out Kevin's article. > > It's probably on the web > > site. > > > > Hope this helps, Joe > > > > > > At 03:45 PM 4/30/2004 -0700, you wrote: > > >Hi > > > > > >Anyone had further development with a decent > > matching > > >design that is constant . > > > > > >I have made several designs of which none seem to > > be > > >consistant and reliable in matching .The designs on > > >the web are : feed straight onto the first halfwave > > >element-others have a quarter wave section before > > the > > >first half wave element.one feeding a high Z-other > > one > > >feeding a low Z.??????????? > > > > > >I am using a sitemaster-Anritsu s331-c and not a > > >simple vswr meter. > > > > > >Regards > > > > > >Bradley Glen ZS5WT > > > > > > > > > > > > > > >__________________________________ > > >Do you Yahoo!? > > >Win a $20,000 Career Makeover at Yahoo! HotJobs > > >http://hotjobs.sweepstakes.yahoo.com/careermakeover > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > [EMAIL PROTECTED] > > > > > > > > > > > >__________________________________ >Do you Yahoo!? >Win a $20,000 Career Makeover at Yahoo! HotJobs >http://hotjobs.sweepstakes.yahoo.com/careermakeover > > > > > >Yahoo! Groups Links > > > > > > > >--- >Incoming mail is certified Virus Free. >Checked by AVG anti-virus system (http://www.grisoft.com). >Version: 6.0.659 / Virus Database: 423 - Release Date: 4/15/2004 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/
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