John. You should use a Network Analyzer like a IFR 7550A with a tracking generator to properly adjust the Duplexer, unless the service monitor has a Tracking Generator in it.
Have a great Labor Day. Butch, KE7FEL/r To: Repeater-Builder@yahoogroups.com From: w...@arrl.net Date: Mon, 7 Sep 2009 14:25:41 +0000 Subject: [Repeater-Builder] Re: De-sense question Thanks Oz for the comments. You are right it could be the duplexer, but my money is still on that used antenna. I know when I moved the duplexer to here, I had it wrapped in a blanket and strapped in to the car seat like a baby. I found a document on hooking a handheld to the transmit side and adjusting for maximum output. Guess that is my next step since I don't have a service monitor. 73 John --- In Repeater-Builder@yahoogroups.com, Rich Osman <li...@...> wrote: > > John, > > Some comments and observations; > > Moving a 30 or 40 year old might radio invalidate the fact that it was > "working at the other site." > > Duplexers, particularly 'vintage' duplexers don't always travel well. > This is particularly true when the person doing the alignment forgets to > run the locking nuts in... (Of course I've never done this.) > > Of course **I've** never made a mistake reconnecting stuff after a > radio's been moved, either. ;-) > > The idea of a binary search is valid and lets you verify the facts you > think you know. It doesn't hurt to prove that it's the site and not the > radio. > > Finally, remember what happens when you assume... > > Oz > > jmp46534 wrote: > > > > > > Thanks guys for all the answers and suggestions. > > > > I will try most of them, probably not the isolator until we can find one. > > > > The interconnecting cables for the duplexer are from Wacom and are a > > matched set of RG214 that came with the 6 cans. I also have RG214 > > going from the cans to radio and bandpass. > > > > The radio was tuned using a service monitor by the Ham that set up all > > of equipment. He owns multiple repeaters and does know what he is doing. > > > > It worked fine when it was on his tower. The only changes have been > > the coax and antenna now that it is here on our tower. > > > > That is why I am thinking it must be in the antenna. > > > > Oh, I am using a Daiwa CN 801 wattmeter/swr meter with a RG214 cable. > > > > Off to try some of your ideas. > > Thanks and 73 > > > > John, W3ML > > > > > > > -- > mailto:o...@... > Oz > POB 93167 > Southlake, TX 76092 (Near DFW Airport) >
