Nate, I appreciate the sanity check. I've been known to overlook things like that and make some fine blunders!
The gouges you refer to appear to be tool marks of some sort. What you can't tell from the photo is it looks like they were made BEFORE it was silver plated, so I'm assuming some tooling they used during manufacture. They are not as deep as they appear in the photo. Yup, I've checked the harness and connectors, etc. Yup, it does misbehave off site when hooked to other radio(s). Here's a possible clue I forgot to mention. The passband loss, SWR, and even the notches appear to be quite stable when I tap on it (using test equipment of course). However if tapped with transmit RF present, noise on the receiver is very bad. Two of the six cavities misbehave. The other four seem OK... for now... I hate to chop on these at all! But... Paul N1BUG Nate Duehr wrote: > Paul N1BUG wrote: > >> I still can see no other possible source of the noise/desense in >> this cavity. > > Just a sanity checking question... > > You were able to get the cavity to misbehave OFF the site and hooked to > completely different interconnect cables and a different radio, right??? > > You've also carefully checked the input connectors and loops for being > loose (center pin falling out, etc...)? > > Just asking if you've made sure you're chasing the right problem. > Anything that could have physically moved when you were even lightly > tapping the cans is suspect until the can was proven for sure to exhibit > the problem and the connectors were carefully checked, right? > > Just checking... before you chop on those any further... > > In the first photo, what were the big gouges in the plate from? Those > didn't look real good... but didn't seem to be sticking out off the > edges at all. Any thoughts as to how those got there? > > Nate WY0X
