CurtPalme.com Home Theater Forum

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

I'm finally mastering PowerStrip now and have been having a ball all night long trying to smooth out 72Hz, but it just stutters like hell.

60Hz on the other hand is ALMOST smooth free. That was a surprise!

Using Test UFO.com lets you instantly know which timings are the best for you, personally I haven't even come close to what sixty looks like. I could have had it like this for all these years, for Christ's sake!

I then decided to try even 50Hz, to give headroom even more, and that works just as fine.

Then I tried 800p @ 48Hz, which I think I got to work better then 72 actually, but never saved it as I will try some more later. But 60 rules so far. No wonder I thought my Panasonic bluray player I bought looked so smooth and fluid like on my OLED with Baraka.

But that is on my HP2335 and my OLED, soon I will try it on my pj when the gear gets here. Should be any day now.

But damn, that PowerStrip is good!

Give it ago at:

http://testufo.com/#test=framerates&count=2&background=none&pps=480

Now, the bottom line is: If 50Hz works so well.. well then we can use that with 2160i later. AS you have been messing with too. I always thought that, no!, that can't work, it will flicker like mad. Perhaps not!

It could be just me too I suppose.

justin_f · Joined: 27 Nov 2010 Posts: 51 Location: Australia

800p? is this for an edge blend? what projector(s)?

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

No, 800p for the scope screen I have. The black borders on the movies has been removed so it becomes 1920 by 800. Right now, while the projector is down, I practise on the OLED + PC monitor driving them together flawlessly.

Later I want to add a great splitter so I can have all 3 hooked up sharing the same signal - monitor + OLED + pj.

My gear consist off a souped up Marquee 9518 + another 2005 Ultra for spare parts. The re-modded parts are in transit to me now, or any-day now.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

Upwards this time.

http://testufo.com/#test=framerates-text

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

1080P72 requires 180 MHz of clean bandwidth for full resolution. A goal of 200 is overkill. if 1080p72 is as far as you want to go.

Any video card with a 400 MHz RAMDAC has a full 200 MHz of video bandwidth IF the output stage matches that requirement.

1920x800 at 72 Hz only requires 110 MHz bandwidth, easily within the bandwidth range of a stock Marquee.

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

You shouldn't have raster ringing if your video bandwidth is FLAT to the required frequency. So if you need 180 MHz and you have raster ringing, your video chain is not flat to 180.

What you're seeing with raster ringing is phase variations that are the first indicator of running out of bandwidth.

In fact, because of this, increasing your bandwidth until you see raster ringing start is the SIMPLEST method of determining video bandwidth.

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

jbmeyer13 · Joined: 03 Dec 2010 Posts: 1135

Fury's customer support is pathetic..the only reason my HDFury4 is working is because Kurt figured out how to program the damn thing and get through all of its glitches. I run 24hz through my Radiance Mini and then convert that to 72hz via the Fury. the Mini can't handle the BW for 72hz. Kurt's XS+ is one of the examples where you can overclock the processor and still have it work. That's not the case with all of them and he admittedly got lucky with his. The newer 21xx series can handle upwards of 250+mhz so they are up to the task with no problem but they carry a hefty price tag.

There is no such thing as future proof in this day and age as UHD is so f'd up. Don't even get Craig Rounds started on that...

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

That's all new turf for me but glad I got you two to ask when I get there. 21XX will difficult.. ah well, I'll dwell on it and ask around.

But for now, I'll rip my hair out going the distance with 72Hz. What a chocker to see that UFO stutter like that.. unbelievable.

Btw, there is a pre-mode there called Marquee and wonder if the maker of this program is a well know figure here?

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Correct, there are two causes of raster ringing and one is in the deflection circuits. They, too, need to have the required bandwidth and they need to drive both coils equally to a high degree of precision. The coils themselves need to be well matched. I believe that in some cases, having a small variable inductor in series with each coil to allow for deflection coil matching could be helpful.

But which is the cause of the problem IS relevant, because you can't fix deflection ringing in the video chain. Or vice versa.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

Oh come on! The author of this program is here with us @ the CP site?

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Two different things: In a Marquee, the adjustable coils are used to match the image width of the three rasters.
There's one coil for each tube in the high scan rate band, and one coil for each tube in the low scan rate band.

But matching the inductance of the two separate coils in the deflection yoke that make up the horizontal coil system is a different thing, one not addressed in the Marquee circuits.

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Yes it does, but it changes the width because it's in series with the ENTIRE deflection yoke, (H windings) and not just ONE of those windings. So adjusting the width coil does not change the balance of inductance between the two windings. Or at least that is how I interpret the schematic. As it does not alter the balance of the windings, it doesn't have any effect on ringing.

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

And why coil matching has influence on ringing? Ringing is a side effect of the imperfect discharge of the retrace pulse (energy stored in all coils). Also I don't think the manufacturing tolerance of the coils are bigger than 1%, rigning is certainly more pronounced than that.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Oh, believe me, I did a test which proved beyond any doubt that ringing is one effect of imbalanced deflection coils.

I inserted a variable inductor in the coil circuit while I was investigating how to incorporate G90 deflection coils into a Marquee, so that I could also put G90 focus coils in as well, and when I inserted the variable inductor in series with ONE of the deflection coils, raster ringing was DRAMATIC. That showed me that coil balance affects raster ringing.