There is a model folded dipole I saw for 30 megs that had tunable rods at the top of the loops. It had a set screw an could be field adjusted. But then this is lowband and it was more to save weight and make the antenna tunable across more of the band.
Kevin King SCSA BSCIS ARS KC6OVD GMRS KAG0378 EIEIO 2722 Acworth Georgia -----Original Message----- From: Chuck Kelsey [mailto:[EMAIL PROTECTED] Sent: Monday, January 24, 2005 6:46 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: DB224 "Loop" Lengths for 145.110 Mhz? Mike's suggestion is the best method and the one I would choose. I would suspect that this would be the method used by a ham that has no problem drilling a hole in his car to mount a mobile antenna. On the other hand, I'd be willing to bet that the "extend the element with a bolt" crowd is the same group that uses a mag mount mobile antenna. Just an observation. You may disagree. Chuck WB2EDV ----- Original Message ----- From: "Mike Morris WA6ILQ" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Monday, January 24, 2005 12:20 AM Subject: Re: [Repeater-Builder] Re: DB224 "Loop" Lengths for 145.110 Mhz? > > At 04:29 PM 1/23/05, you wrote: > >>I have seen the "screw in the ends" modification and am leaning in >>that direction. But they need to be well sealed I am sure to prevent >>corrosion and the associated noise that can be produced. >> >>I understand that the element to the support contact needs to be >>welded also to remove that intermittent connection and the >>possibility of corrosion causing noise if used in repeater service. >> >>Russ >>N4KOX > > I've also seen a DB224 that was modified by a ham. He cut > the elements just inside the curve and spliced in tubing (that > was picked so that the inside diameter just fit the outside > diameter of the element) to stretch the element. Four elements > times two upper and two lower cuts = 16 new joints. He used > hacksaw cuts tubing and stainless steel hose clamps to verify > the lengths. After the test was done the antenna was took back > down and everything welded. > > The modified antenna was coupled with a new harness made for > 2m and the combination outperformed anything else at that site. > > Mike WA6ILQ > 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/
