I recently purchased a Mainbow and I’m having a bit of trouble feeding video into it from a recurBOY.
When I plug the output of the recurBOY into the video input on the Mainbow it shows the video correctly. However, when I turn up the Alpha Symmetry instead of the generated pattern all I see is a grey/white overlay. See video below
What I should be seeing is demonstrated in the demo video. I have feeding video in from other devices and it worked fine, so I’m guessing it’s something to do with the recurBOY/Raspberry Pi? Both the recurBOY and Mainbow are set to PAL (I’m in the UK).
I don’t think Russel Kramer/Chroma Couldron is on here but I’ve also reached out to him via e-mail but any insights anyone here can give (paging @cyberboy666) would be warmly received.
Somewhere else in these forums there was a signal issue with the output from a Mainbow that was fixed using a Kramer 104L Proc Amp… Maybe be the Mainbow would play nice with the recurBOY signal if you used a Proc Amp to amplify the signal from the recurBOY into the Mainbow. Just a thought if you have one laying around to try it with and report back.
hi @hellocatfood - thanks for reporting this issue you are observing. having never used a mainbow myself i cant be sure exactly why this is happening, however here is the previous post mentioned about b/w issues with mainbow output into v8:
although this is other way around i guess could be mainbow having trouble locking on to the recurboy sub-carrier…
one thing you could do is test putting something else (like a distribution amp or tbc) between rpi and the mainbow to see if that makes a difference.
it could be that this issue is unique to pal if other users are reporting these two working together ok - so could be worth testing both with ntsc if possible.
finally another (slightly round-about) option could be to take the hdmi output from recurboy and convert this to composite with an hdmi->composite adapter and see if this would solve your problem
i would like to build a mainbow one day (and am also in PAL land) so if i ever do will be able to test this for myself also
@cyberboy666 thanks for the tips! At the moment I don’t have any of the devices you mentioned so I can’t test it but I probably will need a hdmi > composite adapter soon so will purchase one and let you know.
It’s not all that urgent anyway, just looking forward to when I can do most of my visuals without the ol’ laptop!
I’m on NTSC. Also I’m the person that had trouble with Mainbow showing up B&W on my Roland V8, and putting a dist amp inbetween those two to amplify the signal fixed that issue. However, I’m able to go straight from recurBOY into Mainbow with no amplifier. Definitely worth a try though. I’ve found a little amplification between things has helped other issues throughout my analog signal chain.