Yes, I agree. Various plated connectors can also be a problem. Unfortunately most antenna manufacturers don't use silver plated coax in their pigtails and harnesses.
Chuck WB2EDV ----- Original Message ----- From: <n...@no6b.com> To: <Repeater-Builder@yahoogroups.com> Sent: Sunday, January 03, 2010 2:45 PM Subject: Re: [Repeater-Builder] Mastr II mods and parts > At 1/3/2010 11:11, you wrote: > > >>Yes, it was resolved at a lot of commercial sites by not allowing it to be >>used ;-) > > For me, the "resolution" came from a Times Microwave sales rep. who > admitted that LMR-400 is not appropriate for duplex use. > > Having said that, you can get away with using it in situations such as > temporary/portable repeater installations provided the connectors are > installed properly & the feedline is not used near the antenna, where RF > can couple to the outer braided shield. In no circumstances would I ever > use it at a shared comm. site. > >>Usually after a bit of time, the cable will start to become a source of >>noise as the two dissimilar metals start to react with each other. There >>are many documented cases of this problem. Search this group's messages >>and you'll see this has been discussed over and over. It comes up about >>every other week. > > BTW, they don't need to be dissemilar metals. I once confirmed a 100% > copper braided RG-213 jumper as a PIM source. I only use silver-plated > braided coax beyond the duplexer from now on. > > Bob NO6B > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.725 / Virus Database: 270.14.124/2597 - Release Date: 01/02/10 03:22:00
