My dad was a motoroxla tech, made the first cell call with Martin Cooper. Anyway he would have loved to watch you guys rf nerd out. He passed last year a few weeks before his birthday last year. I wish he kept more dox.. all i have is a today is photos and a metal box full of post cards he exchanged with people around the world on shortwave. R I P

This video is unbelievably helpful to me! I have one that I bought from another repeater owner 3 years ago…I used it for about a month then started having trouble with it …So sent it out 2 times for tuning same guy came back worse than it was …so put it on shelf for a year or longer and sent it out again to a different company for tuning came back pretty good lasted a couple weeks …so back on the shelf again…The other day for no good reason I hooked up my VNA to just one can and it look ok not perfect but not that far out of tune. I accidentally bumped the can I was working on and it fell on its face! So tapped it again and it was back tap again and gone…Found My Gremlin! I don’t know if I can fix it or not and it really don’t matter …but if I can …I would love it …. I really like this old equipment. So if I can fix it, I will need this info to tune it …I have more in tuning and shipping than what I paid for it …So thank you for doing this video …Dave

Thank you! Very interesting! I have the Rigol like yours.. I especially enjoyed your 1/4 wave stub - 73 de K8KEM

Sorry for the caps. I must of hit the cap lock key ( not yelling)

In your words (and not trying to be disrespectable but you laid out the steps in tuning the Duplexer you did not metion that you Normalized the Analyzer this should be done befor you trace out the UUT as this will afeacet the dB MESURMENTS IN LOSS OR GAIN.. YOU CAN ALSO USE MALTABIL MARKERS, SO YOU DONT NEED TO MOVE YOUR CENTER FREQ MARKER BACK AND FORTH OTHER THAN THAT GREAT VID

A very complicated procedure.