CurtPalme.com Home Theater Forum

[bachiano]

G70 raster and patterns and image

Do I understand correctly that I should not worry about the raster spilling over the tubes edge.

I still don't have an external signal to play with.

I've been using the internal generator to play with the Patterns.
Got the green centered at 128.
Then I enlarged the Crosshatch pattern to the max in all directions.
It is now perfectly centered and a good distance away from the tubes edge. ( eye balling )

The raster is perfectly centered too but touches the edge of the tube face.
I'm assuming from all the reading I've been doing that this is ok.

Should I assume that when I get a higher signal I can treat the new image just like I treated the Crosshatch pattern
and not worry about the raster spilling over the edge of the tube
and just make sure the image is centered within the tube face?

Thanks
Bachiano

[Matrix]

I guess you guys are waiting for him to blow up his 180 hr tubes? YES it does matter if the image is on the sides of the tube! You want the image to be cenetered within the tube face but 1/2" from the edges. This is done with the size control anfd the line control in the menu . Centering is with the zone, green first then the other two overlaying the green. You may have to manualy adjust the blue and red tube assemblies on their axis depending on how the pj was set up before you putrchased it and the projection distance from the screen. Do you have a setup manual? You need to read it before you destroy the G70

[bachiano]

Hi Matrix

I appreciate that at least one person has responded to my query.
But, I don't think you read my post carefully.

Please re-read and then let me know what you think.

Thanks

Bachiano

[Matrix]

All signals need to keep the image within the range I specified. You will need to do the same setup from scratch on the electronic settings for each signal. When you try the new signal at a higher freq rate, you need to restrict the image within 1/2" of the tube face left and right margins. If the new signal runs out over the sides, that is not unusual, you just need to adjust the size of the image. Not sure if I have answered your question and I am absolutely certain others on the forum are more qualified to answer and explain the proc3edure. How about it G70 experts?

[bachiano]

From what I understand. The image of the higher freq rate will be even smaller than that of the internal pattern.

What I'm asking is about the Raster.

Is it ok to let the raster spill over the edge of the tube face when I feed the pj the higher freq
and I expand the image to maximize phosphor usage.

The Raster is below black anyway. Right?

[Matrix]

The definition of raster is the actual image being scaned and projected on the phosphor surface. Maybe you are refering to the retrace line at the top of the tube? Please forgive me, I just do not understand what you are asking. My knowledge is not sufficient to provide an answer.

[bachiano]

That's ok you, tried.
I appreciate the effort

The Raster are the lines you see when you turn down the contrast all the way and then turn up brightness until you can see it.
The image can be moved around within the raster.

Raster without an image: http://www.curtpalme.com/TubeRasterSetup2.shtm
Raster with an image: http://www.curtpalme.com/TubeRasterSetup4.shtm

[dturco]

I'll take a stab at this. No you should not let the raster go off the tube face. The raster going off the tube face by itself will not necessarily be bad for the tube. However,it does leave open the chance that when you change frequencies [480p to 720p] or [especially 1080p] the image can and will go off the tube face for sure. That's where you could [probably would] have tube implosion.


EDIT: allowing the raster to go over the edges of the tube is not a good idea. The tube edges do not have cooling fluid and the electron beam can overheat the glass and cause it to implode.

[Matrix]

dturco, Thanks for the explanation. I learn something new every day. After looking at the links to the photos provided by bachiano, I now have a question. Can the raster be smaller than the projected image? Meaning, is the raster size setting controlled by the SIZE adjustment in the setup menu or some other setting controls the raster size? How do you set the size of the raster? Terry set mine up years ago so I really don't know.

[dturco]

The raster can never be smaller the image. The image is always a box [image] in side of a larger box[raster]... so to speak. Or perhaps think of a picture [ image] in side of its picture frame [ raster]. Now as for how to set the raster on a G-70, I have no idea, I have never seen one. I have a Marquee.

I found it. How to adjust picture starts on page 17. However if you've been using it for years without any issues, do your self a favor don't mess up a good thing.

http://www.curtpalme.com/docs/SonyG70_User.pdf

[bachiano]

dturco

I was under the impression that lower freq signals display an image smaller than higher freq signals?

[dturco]

[dturco]

[AFryia]

You don't directly setup the raster on a G70. You setup the registration via internal patterns and external sources.

I would recommend reading this first!

http://archive2.avsforum.com/avs-vb/showthread.php?t=702029&highlight=focus+g70+brian+hampton

and this

http://www.curtpalme.com/forum/viewtopic.php?p=248848

IMO 1/2" from tube edge is a waste of tube face. I max out the raster/pattern to ~5mm then use then use Blanking to keep the image from touching the tube edge.

[bachiano]

Dturco

I understand what you are saying but this is a G70.

Raster / Image size on the G70 are not independent as far as I've been able to discern.
In other words, in setting the G70 the image is what we worry about, not the raster.
I know that sounds weird - I came from an Xg and I feel like a newbie.

Hence, if I throw a higher freq signal then the raster will get smaller too.
( I think - I'll find out soon enough when my moome card gets here)
If that's the case then I'll just enlarge the image until the raster gets near the edge of the tube.

What I'm trying to figure out is,
if I let the raster bleed slightly over the edge of the tube in order to maximize phosphor
while keeping the image a safe distance from the tubes edge. Will that be a problem or not?

I'm presuming not as the raster is below black and in the g70 the raster is automatically made smaller with higher frequencies ( I think )

[bachiano]

Afryia

I must have bee writing while you were posting.

Thank you for the info.

Got to go to dinner now.

I'll be back with another question later

Thanks

[bachiano]

Afrya wrote: " I max out the raster/pattern to ~5mm then use then use Blanking to keep the image from touching the tube edge."

How much larger is the raster in relation to the pattern/image?

Do you let the raster itself bleed past the tube's edge and the image is 5mm in from the edge of the tube?
Or
Do you place the raster 5mm in from the tube's edge and the image is further in?

Good info
Thanks

[AFryia]

[AFryia]

If you're uncomfortable with 5mm try ~10mm from the edges until you get SKEW and KEY (keystone) setup.

[bachiano]

Hi Afryia

You've answered all my questions and it is very clear now.
My concern was to determine if it was ok for the raster to touch and bleed over the edge and you have confirmed that it is ok.

Thanks
Bachiano