band-reject

I’m having the issue where my SWR will not stay rock solid. If I get it just perfect, it does. Any other time it’ll start to climb excessively, then hold steady. Or it keeps increasing. The PA cuts power & I’m forced to power off. Equipment is a Motorola MTR 2000 with the hated Notch Reject...

I have a band-reject (notch filter) duplexer with low side at 462 MHz (transmitter) and high side at 467 MHz (receiver). I would like to learn on how to tune a duplexer, so I’ve watched many tutorials on the use of a VNA. What I am having a hard time understanding is why S21 is connected to the...