At 4/19/2010 10:24, you wrote:
>I have 2 C-Series bandpass cavities, with individual I.L. set at 1.0 db >each. When I couple them together and measure, I get a total I.L. of 2.9 >db. I should see something like 2.1 or 2.2. I have measured the coupling >cable and see < .1 db, so the cable is good. Anyone have an idea why the >loss is so high when coupled? Did you actually measure the individual loss of each can, or are you just going by the indicators on the loops? Try changing the length of cable between the cans. I think an electrical 1/4 wave multiple (1/4, 3/4, 5/4, etc.) is what you want. Bob NO6B
