I'm working on a theoretical design, but I need 5 circulators.
On Thu, Oct 29, 2009 at 5:09 PM, cruizzer77 <atlant...@gmx.ch> wrote: > > > That helical duplexer design is actually the only one I have ever heard of. I > think I even contacted the builder once but he said it was too long ago to > remember additional details what I can understand. > > Even though this particular one sure works, as long as it's the only one > around obviously I tend to agree that they must be kind of hard to build or > adjust. > > Anyone else know anything? Especially also about the hybrid ring thing? > > 73 > Martin > > > > > --- In Repeater-Builder@yahoogroups.com, "skipp025" <skipp...@...> wrote: >> >> >> >> >> The Helical Duplexer tends to be lossy... it's hard to >> get/keep the Q value respectfully high in many home-brew >> projects (but it can be done. You might research some >> of the older Decibel Low-Band units for examples. There are >> actually a fair number of mod/construction projects posted >> on the web. >> >> The 1.5/8" and 1.1/4" (inch) hard line notch pass duplexers >> are actually pretty nice... and cheap if you're resourceful >> with recycled/removed feed lines. >> >> s. >> >> --- In Repeater-Builder@yahoogroups.com, "cruizzer77" <atlantis7@> wrote: >> > >> > We're going to build a 6m repeater in a place where space is very limited, >> > which means that building a full-size cavity duplexer is not an option. >> > >> > Of course there's the heliax duplexer, but I would also like to evaluate >> > other possibilities, i.e. the helical duplexer or even a hybrid ring >> > duplexer with helical resonators. >> > >> > I have got some theoretical info about them, but very few info about >> > actual built units. >> > >> > Has anyone (successfully or not) built a helical or hybrid ring duplexer >> > for 6m? Any info appreciated! >> > >> > 73 >> > Martin >> > >> > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
