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 > "Steve Bosshard (NU5D)" <[EMAIL PROTECTED]> wrote: > > Hey Skipp, I think the trick may be to keep the cable immobilized. I have > it secured to the tower at every rung so it don't flex in the breeze - I > have seen 7/8 air puncture from slag in the galvanizing on the tower. So > far I have had good luck - I have had LMR 600 up on 3 runs at 100 ft and 3 > runs at 150 feet for about 8 years now - used for back to back radios using > Rayfields NetLink MP. Also have some LMR1200 but 7/8" stuff is just as cost > effective and weighs much less. Time will tell and thanks for your kind > warnings, > > 73, Steve NU5D > > > On 5/23/07, skipp025 <[EMAIL PROTECTED]> wrote: > > > > Very nice... but... "fed with 1/2" LMR 500" > > > > It will be interesting to find out how the LMR-500 works for you > > over time. I hope you don't use the words "cluster [EMAIL PROTECTED]" in > > your > >
