I seen one once built for 11M. back in the 1970's used either a 1/4 or 1/2 wave of some coax and had to be precise it was spliced by a barrell connector, it was called the cobra coil. It never worked for me just a waste of time.
MH ----- Original Message ----- From: "Paul Kelley" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, October 07, 2004 12:00 PM Subject: [Repeater-Builder] coaxial collinear > > I finally got around to constructing my first coaxial > collinear as per: > > http://www.repeater-builder.com/antenna/wa6svt.html > > (and using a few of Kevin's ideas) > > I have a question for those who have built these. Referring > to step 9 and figure 4, I assume the decoupling sleeve > connects a *true* (free space) quarter wave down from where > the feedline connects to the first half wave element? > > > Something I've discovered which may be of use to other > antenna builders... I had trouble finding coax guts that > would fit inside the K&S 5/16" tubing. Most of it was just > a little too tight to be forced into the tubing. Then I > discovered if you chill the coax guts in the freezer for > about 30 minutes it shrinks enough to slip in! It's still > snug but it'll go in. It then becomes *very* tight after it > warms up, and probably cannot be easily removed. Using this > technique, Belden 8237 and 8267 is usable for solid > dielectric designs, 8214 for foam. Actually most 8214 can > be forced through without being chilled. I found one NOS > piece of 8267 that fits without being chilled, but the new > stuff doesn't (at least not the two pieces I ordered from > different suppliers as a test -- your results may vary, > considering construction tolerances for both the coax and > the brass tubing may cause unpredictable variations). > > Paul N1BUG > > > > > > > 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/
