Hi Ok skipp that would be great.
The versions I have been trying are from bottom to top: 1/4 ,1/2 times 4,1/4 coax , 1/4 freespace element. Regards Brad --- skipp025 <[EMAIL PROTECTED]> wrote: > OK, but I'm not sure if the "first element" is the > top or the bottom. The more popular coaxail types > use a freespace 1/4 wave radiator at the top. > The bottom 1/4 radiator is used to decouple the > feed line (prevent feed line radiation). > > You also have to pay attention to the coax type > and specs for proper lengths. > > One project version I've seen in the Brown Cover > (older) ARRL Antenna Handbook has a nice project > detailed. Of specific note is the testing during > construction of shorter sections, before the entire > antenna is constructed. > > The mentioned version has both the top and bottom > 1/4 sections as detailed above. > > If you're really into this, maybe one of us > (including myself) would be able to scan & Email > the ARRL project antenna for you. > > cheers > skipp > > --- In [email protected], bradley > glen > <[EMAIL PROTECTED]> wrote: > > Hi Skipp > > > > Using coaxial-type and have tried both the coax > and > > solid screen by way of solid copper sleeving over > > centerwith dielectric from rg-213. > > > > My question is that there seems to be very > different > > thoughts on the first element-some use 1/4 and > others > > use 1/2. > > Every article-design seems to state that there > antenna > > works well or better than antenna X or Y. > > Of all the designs none have substantiated the > design > > with an analyser of any kind -all are going on > only > > VSWR readings.Good VSWR does not mean good antenna > . > > > > Kind regards > > > > Bradley Glen ZS5WT > > --- zip14225 <[EMAIL PROTECTED]> wrote: > > > Bradley, > > > > > > I'm not sure what type of the many collinear > > > antennas you're trying to match. Are you working > > > > on a coaxial type or an aluminum tube type. > > > > > > Many collinear type antennas can be broken into > > > sections and matched at each section. You give > > > us a bit more info, we'll give you a few more > > > thoughts. > > > > > > cheers > > > skipp > > > > > > > bradley glen <[EMAIL PROTECTED]> 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 > > > > > > > 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 <*> 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/
