CurtPalme.com Home Theater Forum

stridsvognen · Guest

mp20748 · Posted: Tue Nov 12, 2013 2:21 pm Post subject:

mp20748 · Posted: Tue Nov 12, 2013 2:23 pm Post subject:

stridsvognen · Guest

i wonder why the Barco 909 fanboys have been so quiet in this thread.. Maybe they will get back when the Barco 2Ghz bandwidth boards are instaled Cool

stridsvognen · Guest

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I guess I can. I'll have to set up the resolution and store it in the unit. It can have resolutions stored or deleted in its memory bank.

I had issues with it automatically choosing the resolution it wasn't suppose to choose when the splash screens from the BD player or dish box came up( they are lower resolutions sometimes). So I only kept the 4 I need. I can load up the default list or I can adjust it from the front display panel. but that is a bit tricky.

I just used TV-ones resolution editor and its showing the 1920x1080@96 as a 289.780MHz pixel clock!!! I am not sure it can do that high .

At 72 hz it come up at 211.79 I guess it depends on Front porches etc .

At 85hz it comes in at 253.4 MHz

Athanasios

stridsvognen · Guest

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Kurt use this resolution editor from TV one. It sets the timings for the res you create. no way is that pixel clock rate you showing
is correct for 2400x1125 unless those are not the Actual Pixels and they are the Total Pixels.

http://tvone.CRMdesk.com/image.aspx?mode=file&id=385

Nashou

stridsvognen · Guest

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

the way the TV-one works is you use that program to upload the settings then you look at the results. there is no Onscreen menu at all. So its a tedious process. but you can create a whole bunch of possible resolutions store them in the unit then just switch between them.

Use that editor to see the true pixel clock. many calculators are not accurate. the TV -one engineers told me this program is the best
for a truer not understated clock rate.

Nashou

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Yeah, I wonder how these resolution calculators all work. It seams they all differ?

And it be interesting what the rest of the timing numbers are in some of these pattern generators.

Athanasios

stridsvognen · Guest

I just sende a email to Jim at Lumagen to get the max bandwidth of the new 2041/2042 4K machines, and if there is any framerate limits to 1920x1080P resolutions.

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

This may be obvious to many but it's crucial that the raster is shifted on the tube face to minimize the ringing, even then you'll need significant adjustment of timings (i.e. big HTOT) to completely remove raster ringing from the image and this eats up a lot of bandwith. That's one of the many reasons why Mike's VNB's are so critical as you really need as much headroom as possible to compensate for the porch adjustment.

stridsvognen · Guest

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

I just used CIR's clock calculator and I arrived at the following:

1080p/48: 139.3 HTOT 2565 VTOT 1134
800p/72: 147.3 HTOT 2330 VTOT 880
1080p/60: 174.17
1080p/72: 209.04

I used the same HTOT for 1080p/60 and 1080p/72 which is an approximation based off my 1080p/48 settings. I use a lower HTOT when I run 1080/60 but there is a slight trace of ringing in the image so I'm assuming that to run 1080p/60 with no ringing will require a higher bandwith than the HDQ is capable of. My HDQ will not pass 1080p/72.

As I said, you really need the higher BW to have a shot a resolving 1080p/72 and not have raster ringing. Personally, I'm not willing to live with ringing or banding. These two distractions need to be eliminated to really be drawn into the image. You will also need a Video Processor that can handle a clock rate of 200 to handle the timings of ring free 1080p/72.

stridsvognen · Guest

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

DVI out from HDQ (use HDMI adapters). I can't remember for sure (would have to look back through exchanges with Jim) but 165 sticks in my head as the max pix clock.

stridsvognen · Guest

stridsvognen · Guest

Just got news from Jim ( Lumagen)

(The 2041 and 2042 can output up to 4k24 and 4k30, and both use a 297 MHz pixel clock. The maximum 1920x1080 output rate is 75 Hertz.)

So that will not help us testing 1080P 96hz

mp20748 · Posted: Tue Nov 12, 2013 6:34 pm Post subject:

The mini cable upgrade I would say is very important. But understand that I had upgraded from a cheap cable i was temporarily using. Changed out to the Commscope cable and things greatly improve.

If I had the mini RCA connectors I would provide the cables with the boards. But can't seen to find them, or remember which size tip out of the two different sizes for the mini RCA's

As I've mentioned before, the shielding or ground of the wiring is the most import thing needed. This same make and model cable was listed on Ebay yesterday for cheap.