Re: 6 Meter Heliax - Hard-line Duplxers Piston Caps A recent Email conversation with another Group member...
I had recently revisited the subject of the Hard-line Notch sections & Duplexers followed by a few Google Searches. The results returned the classic Texas Duplexer and a number of other clone and next-step projects. However, One England/UK Ham had dealt with the piston capacitor problem by making his own and sharing that information with the US Amateur whose web page I found the initial pictures and description of. You simply need to search Google in more detail to find that page. When I get back to my office computer on Friday I can try to forward the URL or duplexer info to you if you direct Email at that time. There's a lot of new material on the web regarding 6 meter duplexer projects so a revisit is well worth the effort. There are other methods to construct most every section of the original design, some are major improvements. I ended up saving about 6 different web page sources full of wonderful ideas. They're still on the web if you search them out... s. > "tahrens301" <tahr...@...> wrote: > > Hi Folks, > > Well, they are complete, but there seems to be > a problem with the transmit side 'cavities'. > > The variable capacitor from the center of the SO-239 > to the center conductor gets extremely hot. > > I'm running about 70 watts out of the PA, and the > devices that I used are identical to what was shown > in the construction article. > > Just wondering if anyone else has built these, and > did you see heating as well. (the first piston trimmers > I used arc'd right thru)! > > Thanks, > > Tim W5FN >
