At 4/13/2007 20:52, you wrote: >I find this very interesting. This repeater ran on Belden 9913 for 7 >years with no problems. Same duplexer, same power, same antenna. >Please tell me why LMR cable is not good for duplex ops? It is no >better or worse than 1/2 hardline. And for a run of 50ft using >hardline is just not an option. I have a fiberglass 3db Maxrad UHF >antenna on the tower also and am going to switch to this to see if >the antenna is the problem. way too many folks disregard the fact >that some of us cant afford to buy a DB-404 or something like that
Surplus 1/2" hardline in decent condition is often cheaper than retail 9913. W.r.t. antennas, I recently bought a DB-408 at the local swap meet for $20, so sometimes you just have to know where to look. Still, other "ham-grade" antennas will work depending on how severe the conditions are at your site. I've been using several Comet GP9s for almost 10 years now & have yet to have any problems with them. It just so happens that the Cushcraft 4-pole is a problem antenna when it comes to duplexing because of the phasing harness. I have one at the house & can only use it for TX or RX only - no duplexing possible without lots of desense. Bob NO6B
