Try testing each cavity by itself, then test each Tee and each cable individually to see if you can isolate a bad cavity or component. When testing each cavity try moving the tuning rod in and out to see if you have a dead spot from arcing or carbon build-up. If that model has the capacitive tubes on the side of the cavity remove and clean all those components as well. If you can't locate any faulty components on the exterior then internal inspection will be necessary. and it may be simpler to send it back to Wacom/Telewave for repair. Also, I hope your using a service monitor with tracking generator or a signal generator and spectrum analyzer or some type of equipment that you can see the the freqency trace on as you feed it thru the cavities.
I have 2 similar 4 cavity sets here and the top and bottom plates appear to be press fitted to the round body. I've beaten the tops off of several DB-40xx cavities and reworked them then put them back together but they are both press and riveted together and I would think easier to disassemble and replace then the Wacom cavities. Of course if the cavities are notching the signal you are trying to pass thru them that might make you think they are bad too. LOL in finding the problem. Doug N3DAB --- In [email protected], Larry <la...@...> wrote: > > Would anyone on the list have any info > for the Wacom WP-640-6 Duplexer. > > I realize that Telewave makes the TPRD-1556 and shows it as an equivalent > However the cavity construction, cables and cavity port connections are > not the the same. > > Anyone know how these are constructed inside. > > The duplexer doesn't appear to have been damaged or dismantled but we are > unable to pass any frequency through them. > > Pointers welcome. > > Larry - N7FM >
