Whoops. Should have said "no movement" and I should have changed the subject line.
Chuck ----- Original Message ----- From: "Chuck Kelsey" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, May 24, 2007 6:35 AM Subject: Re: [Repeater-Builder] Re: DStar Repeater Pics > 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 >> > > > > > > > Yahoo! Groups Links > > > >
