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sdvette
Joined: 28 Sep 2007
Posts: 62
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| Posted: Mon Nov 12, 2007 4:23 am Post subject: how far back for a G90 |
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My G90 is getting mounted this Wed. What is the correct distance for a 16x9 screen that is 120inch diagonal. I think its 96inches wide by 54 high.
thx,
Jim
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Chuchuf
Joined: 11 Mar 2006
Posts: 548
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| Posted: Mon Nov 12, 2007 10:30 pm Post subject: |
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Download a copy of PJCalc 3.2 or newer and use it to determine your throw distance. It will be close.
Terry
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bomrat
Joined: 10 Mar 2006
Posts: 117
Location: chicago
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| Posted: Tue Nov 13, 2007 10:29 am Post subject: |
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set it up on the floor and measure, its the best way to ensure max raster useage.
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Frank D
Joined: 20 Jun 2006
Posts: 73
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| Posted: Wed Nov 14, 2007 2:05 am Post subject: |
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Going from memory here but perhaps someone else can verify this too:
If you want to maximize the phosphor usage to get maximum light output - I think it is about 1.25 x screen width.
My G90 is set up about 115.5 inches for my 92" wide X 52" high 16:9 screen - from screen to center of green gun front glass lens.
PJ calc is not set up for max phosphor usage and therefore should give you a farther measurement (ie less phospor usage).
Last edited by Frank D on Sun Mar 09, 2008 6:47 am; edited 1 time in total
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sdvette
Joined: 28 Sep 2007
Posts: 62
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| Posted: Tue Nov 20, 2007 6:22 am Post subject: |
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I did the PJ Calc and it looks like it needs to be 141 inches back for my screen. Seems pretty close. Any exerience if I put it further back I would use more of the CRTs?
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papalek
Joined: 08 Mar 2006
Posts: 1536
Location: Longs SC
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| Posted: Tue Nov 20, 2007 10:42 am Post subject: |
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The farther back the LESS usage of the phosphors. 
_________________
My current list of PJ's AmPro 1 1/2-4600,4200, 1/2-3600,2600.
I do love my AmPro's
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Nov 20, 2007 11:45 pm Post subject: |
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Rule of thumb is 7% closer than PJCalc-uhhh-calculates.
_________________
Tech support for nothing
CRT.
HD done right!
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sdvette
Joined: 28 Sep 2007
Posts: 62
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| Posted: Wed Nov 21, 2007 6:03 am Post subject: |
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really 7%..that would put me somewhere in the 131 range.. does that sound right for a 16x9 120"screen. I think the actual measurements are 104 inches wide by 54 inchs high. The bottom of the CRTs will be within about an 1 or 2 of the top of the screen...so I think that with the inch or so on the mount I will be almost right on...but am very concerned with getting the distance correct..anyone have PJ Calc and can verify my numbers including coming 7% closer would be great...
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sdvette
Joined: 28 Sep 2007
Posts: 62
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| Posted: Thu Nov 22, 2007 6:42 pm Post subject: |
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anyone??? This thing goes up on Monday and I would really love it if one of the people in the know could validate my numbers?
thx,
Jim
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Thu Nov 22, 2007 8:11 pm Post subject: |
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I think this has been posted about 1000 times....point it at a wall, max the raster and measure the distance from the wall to get your required screen size.
Chris.
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