I have come across a set of combiner filters for 863mhz. These are Sinclair C4337-1RWB units. There are three bandpass and two notch cavities per set. In other words, 5 cavities for tx and five for receive. The cavities are 12X6.5 inches. they appear to be 3/4wave at 863mhz.(or so) Not sure what kind of system they came off of. 800mhz stuff around here is very scarce.
The cavities look like they could be reworked to make a 220 duplexer with a little effort. Does anyone have any experience with these or know anything about them?? Thanks Doug VE5DA
