Hi Skipp, The combiner in this rack is a Celwave TJD220-5T and there is another number on the rack, Model 720160 (forgot where this was located on the equipment). My goal is to come up with a plan for a 222mhz duplexer for a friend's linking project. I shouldn't have sold my 222 repeater after all, but that's the way it always goes. You need something after you sell it. It looks like there are enough cans to make something work. I was thinking 2 pass cans and 1 notch can on each side. 6 cans in all, I just have to experiment with the connecting cable lengths. This will be a low powered linking repeater, so duplexer losses will not be a big issue.
We can take it private, but others may be interested? 73, Joe, K1ike The GLB is in the mail, Priority yesterday 12/30/08 skipp025 wrote: > Hi Joe, > > I have a large number of the Securicor, Intek 220MHz ACSB > trunking combiners removed from service here on the West > Coast (California). T'was at one time quite the build-out... > going from Texas up through Alaska. > > At first glance it appears least one of almost every antenna > combiner manufacture produced their own version of the 5 channel > combiners for the various incarnations of 220MHz Trunking. > However, there are/were other size trunking systems... I have > also seen and worked with two and three channel TX combiners. > > So I have Wacom, Cellwave, Aerial Systems, RJ, Telewave, Sinclair > and a few other custom made configurations here. And there are > different variations of combiner systems made by the various > manufactures. It's very interesting to see how different people > accomplished the same task with fairly similar and different > hardware layouts. > > So what is most practical to do with what you have depends on > what specific hardware you received. In most cases it's well > worth your time to try and track this stuff down... lots of > the hardware found in the combiner translates to use in other > applications. > > Specific to the Cellwave hardware you have... depends on what > you have. Some of the Cavities are set for pre-selection insertion > loss, some are set for one frequency notch. Some cavities have > semi fixed loops/probes that are hard to work with... and then > there's the easily adjusted bottles. > > I measured and made actual performance graphs for the Cellwave > version... so email me direct if you would like to talk more > about it off the list. > > I'm using a number of the original as-built TX Combiners at > various mountain top sites. They simply needed minor modifications > and re-tuning. Some of the combiners racks (like a number of > the Cellwave units I have) include receiver pre-selection. In > many cases the receiver pre-selection will work for low power > systems but is really not enough for 2 or more high powered > transmitters in the typical close spaced Amateur Ap. > > The Aerial Systems Square Cavities mentioned in dcflux's post are > really, really nice units with relatively much high Q compared to > slightly smaller round cavities. But they are cumbersome to mount > if you don't have the original mfgrs rack rails. > > I can post information and hints here if people are interested > but it's probably more practical to yak off the list. Please > feel free to (send food) email me direct. > > cheers, > skipp > > skipp025 at yahoo.com > > > >> Joe <k1ike_m...@...> wrote: >> I have an opportunity to get a combiner/filter panel from a >> 220-222Mhz ACSSB system that was abandoned years ago. Has >> anyone experimented with making a 222Mhz duplexer out of >> the parts in the Celwave rack that was used in this system? >> 73, Joe, K1ike >> > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > >
