Since your chief complaint is noise, you need to define the noise. Noise in repeaters can be from MANY other sources besides duplexers. Sure your cans *might* be at fault, but if you're not having desense issues, I would not suspect them right off.
Is there anything loose on the tower? What kind of antenna are you using? Is it broke inside? Is anyone else at the site having noise issues, or just you? Is there anything loose on the tower as a result of the lightning? (burnt off grounds, etc.) Is there a PolyPhaser or similar device in the line that might be causing trouble? Will the repeater duplex into a dummy load with no noise? If so, your problem is not in the repeater, interconnect cables, or duplexer. It's in your feedline or antenna. Lightning can do funny things to antennas and feedline that are not readily visible to the eye without disassembly. Busted antennas can cause noise VERY easily. (for obvious reasons) If it *will* duplex into a dummy load without noise, take a dummy load to the top of the tower and see if it duplexes OK in that configuration. If it works with the load in place, your looking at a busted antenna or loose, broken, cracked tower hardware or grounds. Good luck, Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Richard wrote: > I know its been a long time since I first posed the question on what might be > causing the noise we were experiencing after being hit by lightening. After > many trips to the Technical shop for testing, we replaced the repeater ( was > a vertex 5000, now a Icom ur2000) and are in process of checking out > controllers. The duplexers were my big worry. And yes, it would seem that > concern wasn't unfounded. We started experiencing a degradation on the > receive side of the repeater and then, a leakage from the cans. We had the > duplexers checked out with two different service monitors and found nothing! > The technician who works on duplexers took ours apart and found only a little > bit of carbon, but that was it. they checked out ok. We put them back into > service and the noise was there making communications impossible. > We are now going to replace them with a 6 configuration instead of the four > we have been using. > My question to the list is, besides the noise factor and crackling noise, is > there any other methode of discovering if the can's are bad or not? > Yes, I did and have been losing sleep over this one. > > I also wish to thank Kevin and the group for all their feedback on my > question I put in last summer. You helped more than you know. > > Rich Ranta K8JX > www.w8usa.org > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.432 / Virus Database: 270.14.146/2627 - Release Date: 01/16/10 > 19:35:00 >
