The Telewave unit is a tuned circut type too (low pass VHF / high pass UHF), just much more robust. They are capable of running at a much higher power level than the Amateur type. They are also weather proof (with proper connector sealing) if you want to "break out" your feedline at the top of the tower into a seperate VHF/UHF antennas. I have an application where a long run of 1 1/4" LDF was more cost and DB effective than two (2) runs of smaller cable by using a "cross band coupler" both top and bottom. Now i have lower loss, one less run of feedline on the tower and mono band perfromance with dedicated antennas on 2 meters and 440.
crackedofn0de <[EMAIL PROTECTED]> wrote: --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > > In a message dated 4/26/2007 4:39:57 P.M. Eastern Daylight Time, > [EMAIL PROTECTED] writes: > > cross band coupler > > > Thanks that sounds like the ticket..... Seems like the way to go > > > JA How about a diplexer from Comet or Diamond? I looked into this recently for a similar application and couldn't tell the difference between the expensive Telewave crossband couplers and the dime-a-dozen amateur diplexers. The specs given for the diplexers even indicate about twice the isolation compared to the crossband couplers. While the designs appear to be different (tuned "cavity" vs. tuned circuit), I can't find any information that would indicate any pros or cons between the two in practice. Anybody? Both Comet and Diamond call their diplexers duplexers. I have no idea why. They get it right when they call their triplexers triplexers. I was thinking about going with a Diamond product (they at least have a metal housing) and swapping out any UHF connectors for N types. http://www.rfparts.com/diamond/Product_Catalog/plexers.html http://www.cometantenna.com/products.php?CatID=1&famID=6&childID=0 --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.
