Correct. Phelps Dodge did this on their VHF low-band antennas only. I'm not saying that drilling a hole at the ends of the loops and adding a bolt to extend them won't work. I'm saying that actually extending the loop is a better choice form a mechanical standpoint.
Chuck WB2EDV ----- Original Message ----- From: "Kevin King" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Monday, January 24, 2005 10:29 PM Subject: RE: [Repeater-Builder] Re: DB224 "Loop" Lengths for 145.110 Mhz? > > 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 > > > > > > > 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/
