At 3/10/2010 11:16, you wrote:
>Actually, Gary, you are 180 degrees out. On a pass cavity, off frequency >signals see a very high impedence path, an open not a short. If your >version were true you could never use pass cans as a duplexer since both >sets of cans together would show a "short" to EVERYTHING. I wish I had the VNA data from the pass cavities I measured several years ago when I built a 2-port UHF combiner using them, but they were measured while the pen plotter was connected to the VNA & before I wrote a program to convert the Citifile output from the VNA to Excel spreadsheets, so the data was only saved on paper & I have no idea where I would've stuffed the plots. But my best recollection is that at the reference plane of the cavities (front surface of the female N or SO-239 connector, they looked fairly close to an open, but not quite - maybe 10 to 15 degrees off of an open, on the inductive side. Bob NO6B
