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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sat Dec 24, 2011 2:53 pm Post subject: Raster Centering Rings anyone got them? |
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I have heard of these and considering the amount of electronic shift of the raster I have to use to get 1080p on my PJ I have to ask where so you get them, I hate stressing the electronic to extremes.?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sat Dec 24, 2011 4:40 pm Post subject: |
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Raster centering rings are the same as the two pole rings that are used for setting flair or beam centering. They just need to be located between the deflection yoke and the focus magnet.
Scott
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sat Dec 24, 2011 4:51 pm Post subject: Great |
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Thanks again Scott, I figured it was a magnet like those but I thought perhaps it had a higher or lower level of intensity compared to the astig magnets, so this means I can remove the magnets on my 4300 and use them as vertical horizontal raster control magnets, great stuff! It just means stripping the tube down to the deflection yoke not too bad. I remember you talking to Alan about it but nothing was said of being able to use Astig magnets instead of the specific magnets Alan had.
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sat Dec 24, 2011 5:00 pm Post subject: or |
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I am interpreting this correctly I hope, that Astig magnets can be used as raster centering magnets?
I just assumed thats what you meant as I have spare sets of 4 pole astig magnets which I assumed would allow me control of the raster both vertically and horizontally?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sat Dec 24, 2011 5:15 pm Post subject: |
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The right type are the two pole ones in the ring pack not the four or six pole stig rings. The problem with using them is there isn't enough room between the deflection yoke and the focus magnet for the rings and the clamp for the tube neck. You could use the rings if you can find a way to mount them without seperating the deflection yoke and focus magnet too much.
Scott
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Dec 24, 2011 6:21 pm Post subject: |
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| tse wrote: | The right type are the two pole ones in the ring pack not the four or six pole stig rings. The problem with using them is there isn't enough room between the deflection yoke and the focus magnet for the rings and the clamp for the tube neck. You could use the rings if you can find a way to mount them without seperating the deflection yoke and focus magnet too much.
Scott |
What a great idea. Wish I had thought of that 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sat Dec 24, 2011 7:20 pm Post subject: Hi Chip |
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You posted about this years ago if I remember right, it was on your list of upgrade for the 4600, paint job, marquee optics, modded neckboard, I have it saved somewhere, just could not find out about the raster rings specifically.
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Dec 24, 2011 7:36 pm Post subject: |
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Some sets, like the NEC PG series and the DWINs have additional rings right on the main deflection yoke that act as a global raster shift. No idea if they can be adapter to work on a Marquee or BArco, but I'm about to throw out some DWIN yokes if you want them. The yokes have burned pins on the connectors, but the rings work fine.
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sat Dec 24, 2011 7:50 pm Post subject: Thanks Curt! |
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Thanks Curt!, that would be great.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 25, 2011 1:06 am Post subject: |
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| stefuel wrote: | | tse wrote: | The right type are the two pole ones in the ring pack not the four or six pole stig rings. The problem with using them is there isn't enough room between the deflection yoke and the focus magnet for the rings and the clamp for the tube neck. You could use the rings if you can find a way to mount them without seperating the deflection yoke and focus magnet too much.
Scott |
What a great idea. Wish I had thought of that |
Yep, you came up with a pretty inovative way to mount the rings to the deflection yoke. I could never figure out how to magnetize the thin steel rings that would have worked really well. I watched someone magnetize the rings many years ago and it was very simple. I tried to do the same thing but couldn't get it to work.
Scott
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 25, 2011 1:08 am Post subject: |
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| Curt Palme wrote: | | Some sets, like the NEC PG series and the DWINs have additional rings right on the main deflection yoke that act as a global raster shift. No idea if they can be adapter to work on a Marquee or BArco, but I'm about to throw out some DWIN yokes if you want them. The yokes have burned pins on the connectors, but the rings work fine. |
The rings will probably work just fine. The tough part is the mechanical mounting.
Scott
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Thomas Jefferson
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 25, 2011 1:11 am Post subject: |
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The Ampro factory trick for centering the raster was to rotate the focus magnet on the tube neck. That usually would work good enough to get the raster where you want without using alot of registration shift. The deflection shift is ok to use.
Scott
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Thomas Jefferson
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sun Dec 25, 2011 1:52 am Post subject: Hi again |
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I did use the focus magnets Scott but still have to use a lot of horizontal shift, from that exchange with Chip I take it he found a way to mount it directly on the deflection yoke so focus of the beam would not be a issue due to moving the focus magnet too far back, care to share some wisdom Chip?!
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 25, 2011 4:56 pm Post subject: |
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Don't worry too much about using the horizontal shift. That is what it is there for. Static vertical shift and red/blue static vertical shift (40 and 41 code) is okay to use. Try to avoid using the registration (dynamic) shift.
Scott
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Dec 25, 2011 9:55 pm Post subject: |
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since you are using a certain amount of backporch the trick is to center the active image instead of the raster without using static shift.
you have the focus and astig magnets setup correctly when the grid doesn`t move while focussing.
if astig is setup incorrectly it attenuates vertical or horizontal resolution or both severely.
but astig messes with the focus coil ideal position and that messes with the astig...... you get the idea, it`s fine tuning until you get it just right.
just realised i`m a member now 2 years exactly  .
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incova
Joined: 27 Nov 2006
Posts: 789
Location: london
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| Posted: Sun Dec 25, 2011 10:08 pm Post subject: k |
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Thanks again Scott I will check those setting and try not to use the dynamic shift. Hi Dennis!, I am redoing the magnetics on my PJ should have a set of 6 pole astig magnetics soon, then I will just focus on Astig until I get it done right, might take me a week or so.
Thanks for the messages guys on Christmas day no less!
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