[Repeater-Builder] Re: Helical or hybrid ring duplexer for 6m
DCFluX dcf...@... wrote: A 1 rack unit duplexer for a 30-50MHz low band system is impractical vs 4 6-8 foot tall 12 cavities? It is until I actually see a picture (or view it in person) of the actual constructed unit in operation and its measured performance rivals that of the more common cavity types. Otherwise I'll stay on the bus... s. skipp025 skipp...@... wrote: You have arrived at The Land of Impractical. Please watch your step as you exit the bus. s. Re: Helical or Hybrid Ring Duplexer for 6M I'm working on a theoretical design, but I need 5 Circulators.
[Repeater-Builder] Re: Helical or hybrid ring duplexer for 6m
Re: Helical or Hybrid Ring Duplexer for 6M I'm working on a theoretical design, but I need 5 Circulators. You have arrived at The Land of Impractical. Please watch your step as you exit the bus. s.
Re: [Repeater-Builder] Re: Helical or hybrid ring duplexer for 6m
A 1 rack unit duplexer for a 30-50MHz low band system is impractical vs 4 6-8 foot tall 12 cavities? On Fri, Oct 30, 2009 at 2:58 PM, skipp025 skipp...@yahoo.com wrote: Re: Helical or Hybrid Ring Duplexer for 6M I'm working on a theoretical design, but I need 5 Circulators. You have arrived at The Land of Impractical. Please watch your step as you exit the bus. s. Yahoo! Groups Links
[Repeater-Builder] Re: Helical or hybrid ring duplexer for 6m
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
Re: [Repeater-Builder] Re: Helical or hybrid ring duplexer for 6m
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
