I've seen the same thing happen with indoor jumpers that had to movement, no weather. You might get lucky, but be prepared to have your luck run out. And when it does, you get to pay more than you would have had you avoided the stuff in the first place.
Chuck WB2EDV ----- Original Message ----- From: "skipp025" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, May 24, 2007 2:11 AM Subject: [Repeater-Builder] Re: DStar Repeater Pics > Hi Steve, > > Based on my most recent dance with LMR feedline I don't use it in > any duplex radio system. Nor to I try to use it in any half duplex > radio system. The last horror story was a local club repeater. Some > yet unknown person replaced the coax cable from the circulator (IMD > Panel) to the duplexer with an equivalent length of LMR-400. > > The mentioned repeater arbitrarily started acting real funky after > a year or two in operation. Grunge and reduced sensitivity were > the owners complaint. > > Much testing of the entire system and after a number of hours the > location (and verification) of the problematic LMR-400 coax jumper > again confirms another Times Microwave Cluster $%*$#. > > Replacing the LMR-400 jumper returned the system to normal operation. > > I have no clue what causes LMR-400 to become problematic in at least > two or three ways I've experienced system problems. But some of these > jumpers and coax lengths are in very well protected locations. So I > discount excessive heat, abuse and movement as possible problem > contribution sources. > > The wifi crowd jumps on the LMR-400 wagon because of cost and > promised spec ... based on what I call the Wal Mart effect. But most > of the wifi stuff is actually only half duplex operation... with > rapid t/r switching. So they don't normally have the full duplex > fun I've run into. > > Alas the no free lunch rule applies. Any nearby transmitter can > cause the LMR gremlin to visit so I suspect some of the wifi people > are scratching their head with system problems and no clue as to why. > Or as in many cases out here.. they simply deem the path unusable > without good reason. > > I hope the LMR feedline works better for you than it has for me and > (now) more than a few of my customers. I'm sure the war stories will > continue over time as people figure out where the shot in the foot > came from... > > cheers, > skipp >
