My experimenting is showing that it's not going to be too difficult to make a combination of notch and bandpass cavities from the 70cm?Sinclair Q3220E. Not going to try to make the combined notch/pass cavities, that gets too much into "magic". If necessary I can go with 2 antennas with the duplexer if I need additional isolation. Luckily I have a Tek 794P analyzer with companion tracking generator. First tried a NanoVNA-F but since it's working on harmonics at 23cm, it kept tuning on the 70cm resonances.
August KG7BZ
