NES NTSC PPUdigitizer with OSSC - can't get proper image

[phosphide]

Hello!

I recently installed PPUdigitizer in two NTSC-US NES consoles with the intention of using them with OSSC, however I’m unable to get any reasonable image.

Hardware details:

Both mods were done as a socketed sandwich, both consoles still work perfectly fine over composite after doing the mod. One of them has Lumacode wired over a temporary extra RCA socket outside, the other one is routed through the RF modulator.
One of the consoles has a 2C02G, the other a 2C02E PPU.
My OSSC is on firmware 1.20, it’s a unit from Bitfunx.

The outcome:

I get very similar/identical picture from both consoles. After plugging it into OSSC AV2/Y input I get a B&W picture, detected as 262p 60Hz, with some vertical stripes, but the picture is stable:

After switching to Lumacode NES mode in OSSC input options the image becomes this noisy green mess:

I tried adjusting various OSSC settings (video LPF, G/Y offset, G/Y gain, ADC PLL BW, advanced timing), the noise becomes „different”, but nothing seemed to help in any way. I started with default settings.

Can anyone point me in some direction on how to solve/debug this, or whether it’s an issue with PPUdigitizer installation or the OSSC? I can record the Lumacode signal with an oscilloscope if that could help.

Jakub

[c0pperdragon]

Setting up the OSSC for lumacode is unfortunately a bit tricky.
Most important: You need to plug the signal into AV2/Y (which you did) and then select RGsB as input method.
Some usefull information can be found here:
https://junkerhq.net/xrgb/index.php/OSSC#Lumacode
And there is a nice video from Mark from the RetroChannel: https://www.youtube.com/watch?v=cgC0glqnCRc&t=197s

[c0pperdragon]

Sorry, the above mentioned video does not consider the OSSC, but was for the RGBtoHDMI.
This one here shows some settings for the OSSC (but unfortunately for the C64 and not the NES), but still): https://www.youtube.com/watch?v=6ZZGEm12jUI&t=3s