Hi DCf, I thought so too, but hooked up to/from coax between spect analy & freq gen, & didn't show any appreciable attenuation. Each cavity seems to have about 1.5dB loss each. Hmmm, maybe the 1.5dB on the mounting plate means each! :-)
I found the same thing on some old dB products cans... the loops weren't even soldered at the connector end.. just a blob of solder! Tim --- In [email protected], DCFluX <dcf...@...> wrote: > > Faulty cable harness or cable between test equipment? > > Also I just went through a set of duplexers that the solder joints on > the coupling loops were completely shot. > > On Thu, Jan 28, 2010 at 4:37 PM, tahrens301 <tahr...@...> wrote: > > Well, I thought this thing was tuned up, > > but obviously something is wrong. > > > > These are a set of the 2x2x4" cavities... > > have a plunger in the front, and a variable > > cap adjustment on the back. Also, a pair of > > BNC connectors on the capacitor side. > > > > The plate says Duplexer Vari-Notch, > > 147-174 > > > > It also implies that the TX has a 1.5dB > > insertion loss, but darned if I can get > > only about 4.5. > > > > I've talked to the guys at TX/RX, and they > > are looking for a book on them, but nothing > > yet. > > > > Anybody have any tuning instructions/info on > > them? > > > > The plunger is marked 'pass low', and the cap > > is reject high. Pretty much self explanatory, > > and they tune ok, but the insertion loss is > > higher than it appears it should be. > > > > Thanks, > > > > Tim > > > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > >
