Sync issue between Apple IIplus and Panasonic PVM- am I doing something stupid? #appleii #crt #retro @BigBadBench

BigBadBiologists BigBadBench | Sync issue between Apple IIplus and Panasonic PVM- am I doing something stupid? #appleii #crt #retro @BigBadBench | Uploaded October 2023 | Updated October 2024, 1 hour ago.
I’m trying to connect a Panasonic WV-5350 PVM-type monitor to my Apple IIplus. I added a RCA cable by soldering to the same spots as the BNC input connector. I have tried all switch combinations on the back and this is the only array where I get a signal.

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