Hi, 70 watts out sounds OK. Duplexer's usually have about a 1 - 2db loss depends how they are set up, size of cavities etc and the model type.
Duplexer loss = 10log(Pin/Pout) Duplexer Loss = 10Log(70/100) = -1.54dB. Peter On Mon, Sep 6, 2010 at 10:54 AM, W3ML <w...@arrl.net> wrote: > > > Thanks Joe. > > We did most of those and then found the problem. The T-connector center pin > had broken off when we apparently hooked up some test equipment and did not > notice it. > > I still have one question though. > > Is it normal to have 100 watts coming out of radio and only 70 watts coming > out of duplexer? > > Wacom 6 can type duplexer. > > That seems to be quite a loss. Again I appreciate all the help. > > 73 > John, W3ML > > --- In Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com>, > Joe <k1ike_m...@...> wrote: > > > > What make and model is the duplexer? I know of one instance that the > > loop inside the duplexer can come disconnected due to a bad solder > > joint, but can't remember what one it was. A search on this list should > > find it, as it was discussed recently. > > > > The first thing would be to check all connections for tightness. Do not > > over-tighten the connections! Just make sure that they are snug. If > > your knuckles are turning white, your tightening too much. N > > connectors need to be snug, UHF connectors need to be a little tighter, > > but not cranked down tight, but not until they break. > > > > What you can do is take the connecting cables off the transmit side cans > > and test the first one for power out. Then connect the next can in > > series and see if there is output from that can. This process should > > isolate the bad can(s). Disconnect the receiver while doing this just > > to be safe. MARK all the cables as to where they came from. Do not mix > > them up. It may be a bad cable, so if you find a problem make sure that > > it is not the interconnecting cable. If all the cans and cables test > > OK, their may be a problem on the receive side of the duplexer. Keep it > > simple, don't fool with the cans unless you prove that one is bad. > > > > This process is to eliminate the obvious before you go tinkering with > > the duplexer. Check the tightness of connections first, cables second, > > and lastly the cans. The process above will help you isolate the bad > > can so you hopefully only have to tinker with one can. > > > > The real fix would involve some test equipment. What do you have > > available? Service monitor, tracking generator? > > > > Others will probably have some good suggestions, these ideas are just > > off the top of my head. > > > > On 9/6/2010 9:37 AM, W3ML wrote: > > > Hi, > > > > > > First, let me say that we are still new to the repeater business and > learning as we go. This the first time in 30 ham years that I have been > involved with a VHF repeater system. > > > > > > Our repeater was working okay at 80 watts out of GE Mastr II and 60 > watts out of Duplexer. When I turn the power up to 100 out of radio and 80 > out of duplexer it seemed to be working okay. > > > > > > But, now a few hours later there is no power coming out of duplexer at > all. Radio still shows power coming out. > > > > > > Nothing was touch on the duplexer. Any ideas? > > > > > > 73 > > > John, W3ML > > > > > > > >
