I think he was Laryn. I could see an argument that it may not have been aligned and caused the situation. But,,
In this case the matching circuit was installed and set properly, also the duplexers and all were perfect. The system was stable for years then boom, desense. All I was saying was that this station worked Perfect into a dummy load (zero desense and all to spec) but did not into feedline(+15db) . So we cringed and focused there. We were getting ready to replace the antenna at 580 ft and spend some money after the dummy load test. Luckily the amp finished failing. What I relayed locally after this experience was that a complete system that works flawlessly into a dummy load may not be flawless. I do think the majority of desense problems can be diagnosed with a dummy load and a sampler slug / iso tee. I just wanted to throw a recent experience / monkey wrench into the thread hi. 73 Don W5DK m: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Laryn Lohman Sent: Tuesday, July 08, 2008 8:50 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: New Repeater Desense Problems --- In Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> , wd8chl <[EMAIL PROTECTED]> wrote: > It sounds to me like the PA wasn't aligned properly. Or the duplexer is > not aligned properly. Most, but not all, MastrII PA's have an output > filter section that is tricky to align correctly. Are you referring to the Z matching adjustments on continuous-duty amps? Laryn K8TVZ
