Say Skipp 025 ! Actually very well thought of, at least we are not banging heads flam throwing etc.. I decided to save that one !
Mark Holman [EMAIL PROTECTED] http://www.ab8ru.org Life Member A.R.R.L. ----- Original Message ----- From: "skipp025" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Thursday, April 28, 2005 12:29 PM Subject: [Repeater-Builder] The Answer Is: Re: Mystery: Repeater Problem ofthe Month Club. >> "Brent" <[EMAIL PROTECTED]> wrote: >> or better yet I had a trident ltr controller >> on a uhf system and at times it would lock up >> my rlc2 controller until i took it off the same >> power source and used battery power it fixed >> it.. but the trident controller was holding >> the rlc controller in weird mode when it would >> goto ltr channel 3 >> > > We have a story, which is pretty much the same > animal as my described problem. > > Moving the one repeater over to another DC Power > Supply solved the problem. All the original and > spare equipment repeater hardward combinations > now function as expected (normal). > > The orignal Triplite 40 Amp DC Supply measures > just what it should. Something related to the > output impedance, filtering (ESR), glitch or > HF noise bypassing, grounding or lack of case > cabinet negative rail grounding, ground loop is > probably the the described problem source. > There are two other controllers running off the > same DC rail, some HF noise or logic glitching > on the dc rails might be an issue. > > The output of many DC Supplies is not grounded > to the case/cabinet (floating). The Triplite > negative rail is not grounded to the case/cabinet. > A loop might have been formed from the negative DC > lead wire to the rack mounted equipment, which was > both chassis and frame grounded. > > Fix options might include bonding the Triplite > supply negative rail directly to ground or through > a large glitch diode. Possibly the supply filter > capacitors have poor ESR (old and tired) or there > might (probable) also not be adequate triple > bypassing. A temp fix might have been to "tack on" > additional filter capacitors. > > We are converting the site over to a Master DC > Rail Supply System, the repeater hardware made > the trip a week or two before the planned move. > > I suspect the Triplite DC Supply to have aged > filter caps and marginal noise bypassing. Filter > Cap ESR can be researched on the web or see the > Sencore Test Equipment web site. I'll check the > supply upon full retirement later this month, > although I don't point the finger completely at > the above issues as the problem source. > > There might be a magic combination of glitches > on the DC Rail, sourced from one of the other > controllers or a combination thereof. You may > want an exact reason, I just wanted to be done > with the problem and put this gremlin to bed. > > The Triplite DC Supply remains operational > with the other repeaters working 100% as > expected. Some magic glitch combination is > formed with this repeater in this rack space, > on the Triplitte Supply at this moment in > time after some years of regular operation. > > Go figure... > > Thanks for all your feedback. I hope the next > hair-pull problem goes another direction. > > cheers, > skipp > > www.radiowrench.com/sonic > > > > > > > > > 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/
