We modify the supply rails and take out the low bandwidth semiconductors on the port 5 switcher card. Barco put one part in that lowers the quality of the picture.

We are able then to achieve a much sharper picture on port3 vs port5. Normally on the s model port 5 is superior but if you look at the schematic port 5 input on the switcher is full of all kinds of items that lower the BW.

Notice the port 3 input is clean but lower BW.

Also on the port 3 card we remove all the low BW transistors and replace with one GHZ range Opamp. We do this on the back of the board and seal it in.

Now on the RGB driver board we make all kinds of changes. The most important change is the rails to beef up the caps. Also the input bypass caps need to be changed. We then replace 2 op-amps.

Now on the neck cards we replace 2 transistors with lower noise types and take out a BW shaping cap. We replace it with a 5pf but the original one lower the BW too much at 1080p.

GREG

Lets do this in the forum.

But port 3 is the best picture because you dont have to use cables.

WE found direct DVI out of 5GHZ into the path produces better than anything out of port 5.

Port 5 RGB is basically dead. The technology is not going to be good with any new Device and the picture is softer.

GREG


w sexsmith <wts_747@yahoo.ca> wrote:

Hi Greg,

Thanks for answering my email.

On your first point, that Barco put in a part that lowers picture quality, would you be referring to the port 3 transistor, a BFS17 which is 1 GHz device or something else, please elaborate.

Yes I agree with you on all the garbage Barco put in the port 5 signal path, I plan on removing most of that to make it more like port 3. After all if the lido or the matrix portion isn't going to be used then you don't need all the extra components.

I'm not really interested in the port 3 board.

You mention you make all kinds of changes to the RGB driver board, please specify. You mention beefing up the rails , yes I agree on this to a point. When you say you replace the input caps I'll assume you mean on the switcher board not the driver board. What caps do you prefer to use for input coupling?

Which opamps do you replace, you mention two, does that mean a total of 2 opamps or one for each video section per board which would mean a total of 3 per board(3 for the switcher and 3 for the driver). Which opamp part number do you use in place of the HFA1100, I have a very good idea what MP uses which I don't agree with and I know which one I'll be using, just curious which one you found you like. At the moment I use the OPA695 which is very nice but the new one I'll be using is slightly better.

Now when you refer to neckboards there are a few different versions out there, the ones in my pj have the VPJ08B amps. So with respect to that version have you made any changes? Which transistor have you replaced on these boards, what part# of transistors did use there. On the schematic I have for mine I see a few BW shaping components, which one would you be referring to when you talk about the 5 pf cap?


I hope you don't have any problems being specific about answering my questions.

And again, thank you for answering my email and questions.

Walter


Walter OPA695 is too low

We recommend a min of 1.5 - 5 ghz of bandwidth.

Hi Greg,

Okay lets continue our conversation here.

Are you going to elaborate on the questions I've already asked? What opamps would you be using that are between 1.5 and 5GHz as I have never bothered to look for anything that high in BW.

What 5pf cap would you be talking about?

Actually there's no point in me going over what I've already asked in this thread(which you posted here), so I guess we could start with some answers to the questions >

Thanks
Walter

Hi walter,

Opamps cannot produce the peformance we need. We use seperate tranisistors rated at 5 GHZ. WE design a small board that fits onto the main pcb with 4 tranisistors rated at 5-7 GHZ then connect.

IT comes out nice and the picture improvement is great.

GREG





Recienlty we have been looking at the Cine 8-9 and found some major problems. We have been testing some new components that really do make a nice difference.

I will keep you posed on V5 for the Cine 9.

We have V5 for 1209
New V5 for 1209s

Soon V5 for Cine 9

And we also have a NEW RGBVH mod ( Special order ) for people who do not want DVI.

I hope that helps

GREG