Bob, One of the local guys bought one of these off Ebay a couple years ago. It had six cavities - three per side. I was able to retune it to his 220 repeater frequency. It is a notch type duplexer. I was barely able to get enough isolation for his repeater which was a converted GE MVP with a ARR preamp and one of the Toshiba power modules for the PA. Your eight can unit should be much better. I think the 1.6 MHz spacing is about as close as you can go. In the research that I did at the time I think I came up with that these were made for 2 MHz spacing.
It should tune pretty good if you can find a service monitor or spectrum analyzer with a tracking generator. Good luck. If you decide you no longer want it, let me know and I may have another ham here in the area that is interested. 73, Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, "Bob" <[EMAIL PROTECTED]> wrote: > > Does anyone have any info on this duplexer set made by K&L Microwave? > > Eight 11" tall, 3-3/4" diamter black aluminum "cans" in a 16" wide > aluminum frame--four cylinders per side. On top of the frame at one > side is a BNC antenna port, at the other end of the frame there are RX > and TX BNCs. The interconnecting/branch cables are hard metal tubes > (about 1/8" diameter a la mobile duplexers) that "snake" across the > top of the assembly. > > Each cylinder has what appears to be an inspection port on top covered > by an adhesive "dot"; lifting the dot seems to give a slight glimpse > at what appears to be the coupling loop. > > Tuning appears to be from the bottom via a slotted screw held by a nut. > > The set shows a number 50140 which may or may not be a model number. > While K&L are still in business, they don't seem to keep info on older > or obsolete products. > > If this is, indeed, a 220 MHz unit (or close enough for ham work), it > will have been worth the $20 hamfest gamble; otherwise... > > Tnx es 73 de K5IQ > Bob >
