That looks very much like a DB product repackaged. I had checked into what it takes to move one and was told by factory techs that the cans are helicoils set up to notch. Passes, if they exist, are done with stubs. The tech I spoke to said the unit "could be moved up in frequency" with rework of the heilcoils. The tuning range as I recall was very small but the unit could do a 500k split.
Milt N3LTQ > Anyone seen a set of these before? Any documentation available? Can they > be used on 6M? > > I have never seen this type of duplexer They are marked with 37.98 as a > frequency. The open port on the tees kinda makes me wonder. > > These are not mine. I can't lay hands on them personally. I am posting > this for a friend, and out of general curiosity. > > Scott > . > Scott Zimmerman > Amateur Radio Call N3XCC > 612 Barnett Rd > Boswell, PA 15531 >
