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Author Topic: Is P35-SL SMPTE signal level at Dolby level? Warren Smyth Expert Film Handler Posts: 158 From: Auckland ,New Zealand Registered: Aug 2003 posted 10-12-2003 11:42 PM                     I have been given some P35-SL signal level test film. I was actually wanting Dolby CAT 69 for Dolby level checks. I have been assured that P35-SL is at Dolby level and can be used as such, but I have always assumed that it is only 1,000 cycles reference only. Can any one confirm?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-13-2003 12:24 AM                     I do not believe you will find that it is at 50% modulation and as such, can NOT be used as a substitute for Dolby-Tone. P35-SL was intened to "balance" out the level between two-projectors for changeover back before Dolby. I think you will find that it is recorded substantially higher than 50% modulation. I know that P16-SL (the 16mm equivalent) was recorded at 100% modulation. Steve  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 10-13-2003 12:11 PM                     I don't believe there was a specified level for the SMPTE test film except it is high by a fair bit than 50% modulation of the dolby tone The frequency doesn't really matter as DOlby tone is 800 and SMPTE is 1k UltraStereo's 50% tone test film is 1KHz  |  IP: Logged Warren Smyth Expert Film Handler Posts: 158 From: Auckland ,New Zealand Registered: Aug 2003 posted 10-14-2003 06:21 AM                     Thanks very much Gordon and Steve, you confirmed my view so I bought some cat 69T today. You are right, the P35-SL plays at a higher level. I would guess roughly about 6db. Once again, much appreciated.  |  IP: Logged

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