Amiga RGB Banding fix question

[thgill]

I wanted to ask about the fix mentioned in this thread:

For Sale - Amiga Video - SCART Cables DELUXE

In addition to my Amiga Video RGB-VGA Adapters / Cables listed here, I offer also these Amiga Video RGB-SCART Cables Deluxe. I call them Deluxe, because they are based on quality, robust, multiple shielded OFC quality SCART cable with gold plated connectors and original DSUB 23pin connectors to...

www.amibay.com

He mentions a banding fix for vertical lines that appear on some LCD displays when connected via RGB and that his fix in the cable also disables Genlock ability.

Does anyone have any details on this fix and what exactly is being done?

I'm assuming it's todo with Pin 15 Clock out or one of the other Genlock related pins. Maybe something being grounded?


Reason I ask is because I have always felt the RGB output on the Amiga 600 and 1200 to be inferior to the A500 and I'd like to improve it. And if losing genlock ability via a simple mod to one of my existing RGB cables is all it takes, I am totally ok with that.

Edit: And to clarify, I'm referring to RGB out to Scart rather than RGB to VGA as I know those adapters you some sync strippers or buffers to improve quality.

 

[darefail]

Have you been in contact with @a.mi.goun and just asked him?

 

[thgill]

Have you been in contact with @a.mi.goun and just asked him?

I haven’t as I didn’t want to ask in the sales thread.

 

[Bladejack]

Probably based on this ? https://github.com/EmberHeavyIndustries/AMI-RGB2VGAULTIMATE

 

[darefail]

I haven’t as I didn’t want to ask in the sales thread.

PM maybe?

 

[a.mi.goun]

thgill got it right. It is a simple fix, not a miracle. I terminate the clock signal which causes some noise and together with hi-quality cable it results in very good picture. Most people do not use genlocks, so they can benefit in clearer picture.

 

[thgill]

thgill got it right. It is a simple fix, not a miracle. I terminate the clock signal which causes some noise and together with hi-quality cable it results in very good picture. Most people do not use genlocks, so they can benefit in clearer picture.

Can you detail what pins you terminate? Is it a resistor to ground or something else?

 

[a.mi.goun]

Use a resistor on that mentioned pin (you can experiment with value which gives you best result).

 

[a.mi.goun]

Probably based on this ? https://github.com/EmberHeavyIndustries/AMI-RGB2VGAULTIMATE

Not necessry to put into the cable, because for example OSSC already do this filtering on the SCART input.

 

[thgill]

Use a resistor on that mentioned pin (you can experiment with value which gives you best result).

Pin 15 to analog ground, right?

Have a value suggestion?

 

[darefail]

Pin 15 to analog ground, right?

Have a value suggestion?

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