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Author
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Topic: alignment film
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 09-16-2002 11:22 PM
This is commonly referred to as an "A-Chain Alignment."Minimum test film requirements for analog: Dolby Tone (Cat 69T)
Dolby Pink Noise (Cat 69P)
Crosstalk*
Buzz Track There are others, too, but these are the ones that ALWAYS get mentioned in manuals and they are the only ones I use. You will also need an oscilloscope and a real-time analyzer (RTA). At first glance, the procedure may seem like one great big mystery: lots of test films and gadgets. But -- like a lot of things -- it's not a terribly complicated if you understand what's going on. A friendly tip: Let a professional do it, or learn from a pro. I don't think it's the sort of thing where you want to be reading instructions "as you go." Just curious: What kind of sound head and processor? ~Manny. *Footnote: I'm told that with my LED reverse-scan units, I don't need to use the crosstalk anymore. I still use it "for old time's sake" but when it runs out (I have about 100 feet) I probably won't re-order.
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Sam Hunter
Jedi Master Film Handler
Posts: 779
From: West Monroe, LA, USA
Registered: Jan 2002
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posted 09-16-2002 11:29 PM
A chain, got it.
For right now I will be using mono, stereo later, and anything else, quite a while.
I will need a Buzz track alignment and 7Khz tone for focusing adjustments.
RCA 9030, with Kelmar Mono pickup and standard lamps.------------------
Samual Hunter Sr. KC5ZSL
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Rick Long
Jedi Master Film Handler
Posts: 759
From: Toronto, Ontario, Canada
Registered: Nov 1999
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posted 09-16-2002 11:41 PM
RTA's for mono focus? We didn't need no steenking RTA's!7KHz or even better, 9Khz is great for getting focus on mono systems. It takes a little practice, (9KHz threaded and running) twisting the lens as well as moving it back and forth to get the best focus and azimuth, as read with an a.c. meter at the output of the amplifier (most-sensitive scale). Highest output means good focus and azimuth. A warning tho, this is a "high Q" adjustment. At one point you will see the meter suddenly go high and back to low again. You should never be happy until you are sure you have the highest output level possible. This also ranks #4 on the list of reasons sound men drink. Another method: Without the projector running, and a buisness card nestled in the sound drum where your temporarily removed solar cell used to be, thread 9KHz film. Exciter on, look at the image. Now move the film with your finger slightly. You should see several "cyles" of track on the image on the card, moving as you touch the film. Now adjust the lens until the lens is so well focussed that you no longer see movement, but simply black/white flashes. This means you are in focus.
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Sam Hunter
Jedi Master Film Handler
Posts: 779
From: West Monroe, LA, USA
Registered: Jan 2002
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posted 09-16-2002 11:53 PM
I was referencing to the soundhead manual that calls for a buzz track (lateral alignment) and a 7-9Khz test loop for optical alignment.
So now I need to find them.
Any ideas? I found out that RP40 is for the picture head alignment, focusing and such things.
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Samual Hunter Sr. KC5ZSL
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 09-17-2002 07:35 AM
As for mono, yup, 7 and 9KHz are the focus tools. Go back and forth between focus and lateral position (buzz track)...you can't finalize the lateral position until your focus is perfect (that will have the slit at its widest).For reverse scan, I agree on the dumping of crosstalk (cat. 97) but it should be replaced with Cat. 566 (illumination film) to ensure the film is aligned to the LED. Steve ------------------
"Old projectionists never die, they just changeover!"
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