At 10/1/2008 10:06, you wrote: >I recently put a six meter repeater (52.810/51.110) on the air here in >Anchorage, Alaska. I am feeding it with about 60 feet of LMR-400 cable >and am experiencing quite a bit of desense. I did a search for "LMR-400 in >duplex operation" and came across several posts from users of this list >and decided to sign up and investigate some more. I am running a GE Master >Pro at 100 watts into a 8 cavity Sinclair duplexer. The antenna is a >Diamond co-linear mounted about 35 feet above ground at the present time. >I live on a hill here in town and currently have the repeater mounted at >my home qth. When I terminate the duplexer into a dummy load and look at >it with the spectrum analyzer it performs very well with no desense. >Connecting up the antenna is another story altogether. I have been pulling >my hair out over this one thinking it must be a duplexer problem. >Originally I fed the antenna with RG-213 which I know is not the best >choice for repeater use but it is what I had handy at the time. I was >getting desense with the RG-213 so I switched to the LMR-400 since I had a >roll someone had given me. I actually think I had slightly less desense >with the RG-213. Is the 400 really not that suitable for duplex operation >even at 6 meters? What would be a good alternate choice ?
1/2" hardline or RG-214 (silver-plated braid). Bob NO6B
