Reply To: Noise flowing up the screen..

[Reezo]

Hello everyone!

New user here, I’ve been reading this thread avidly <-fancy terms after noticing the exact same (quote) “..horizontal band of noise that flows up the screen from the bottom. It’s hard to explain, it’s like a heat haze almost, just a jiggly band.”

This is the best explanation for what is happening to me, right now.

My setup is:
– Amiga 1200HD
– Vampire V1200 v2
– Original Commodore Amiga 500 PSU (tried an A600 PSU as well, but it smells as sh*t and will probably die soon :))
– IDE-to-CF adapter plugged on the Vampire IDE
– Ethernet adapter plugged on the Vampire IDE
– MicroSD plugged into the MicroSD slot on the Vampire
– RGB to SCART cable by AmigaStore (4m.. so coiled around because a bit longer than needed)
– OSSC 1.6 with firmware v0.88
– HDMI short cable from my OSSC to my Philips 60″ HDTV
– HDMI cable from my Vampire board to the Philips 60″ HDTV

I basically boot Workbench via the Vampire HDMI and then when loading something from WHDLoad, it switches to its RGB and goes through the OSSC.

All the above is to give you context but it’s probably not related to the issue itself.. the image quality is stunning and the zero-latency feel (I had almost 500 ms when going from the Amiga RGB to SCART directly into my TV.. insane and unplayable).

I remember something that might help go deep in this topic: weeks ago I tried a small, portable 15″ display (unknown Chinese brand, but pretty good-looking and good video quality) to use for the HDMI out of the Vampire board. It worked well but I noticed that the image from the RGB to SCART cable was incredibly noisy, with lots of interference. This portable display was powered only by an non-grounded “phone-charger-size” PSU, with a USB-C cable. As soon as I unplugged the power supply OR the HDMI cable connecting the Vampire to the little display.. the interference would go away completely.

The PSU my Amiga is using is plugged into a multi-socket in which a lot of stuff is connected: lava lamps, a Synology NAS, a small BOSE portable speaker system, two small LED lamps etc. plus the TV, my FritzBox! router and a ROKU player. That’s A LOT of stuff. I am actually laughing now that I am writing this all down, realizing how much is going on, there.

First and foremost, the RGB to SCART cable looks rather thin.. (sorry AmigaStore.. I love you but it is thin). I am sure a lot of interference could be picked from it, but also:

– Interference from devices plugged to the same power line
– RF interference
– Amiga needs recapping

are possible causes, for sure.

It’s nothing horrible, but it’s ‘this close’ to being perfect and it’s a shame that it’s shimmering.

Thanks enough for any info or help you might wanna give me, in the meantime I’ll keep this thread up with any further finding or experiment.