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KB2VXA > INFO 18.07.02 13:09l 33 Lines 1278 Bytes #999 (0) @ WW
BID : 50743_WT3V
Read: DB0FHN GUEST
Subj: Re: VK2YPZ > film/TV transfer
Path: DB0FHN<DB0ZWI<DB0HDF<DB0ABL<DB0HOT<DB0MRW<DB0RGB<OK0PPL<RZ6HXA<SP7MGD<
SR3BGN<WB0TAX<N4ZKF<N0IA<N0IA<K1UOL<K1UOL<WA2PNU<KB2VLX<<WT3V
Sent: 020702/1608Z @:WT3V.#JS.NJ.USA.NOAM #:50743 [Lakehurst] $:50743_WT3V
From: KB2VXA@WT3V.#JS.NJ.USA.NOAM
To : INFO@WW
Hi Kevin,
Thanks a whole big bunch for the explanation of how film frames mate it
to TV fields. Everybody including this Yank who has been not seeing what
he has been looking at all his life now understands.
Technically, you are right when you get down to "brass tacks", there
aren't any TV frames, only fields. Now I begin to wonder if the vertical
scanning rate of 60Hz was chosen to comply with power line frequency or
the other way round.
Actually, the NTSC system is NOT based on 60Hz, but the H scanning rate
of 15.75Khz. Every signal, all subcarriers are based on this frequency.
That started with B&W and when color came along the H scan rate was
lowered by 3% to comply with the 3.58somethingorotherMhz chroma
subcarrier.
Funny thing, I used to be a TV man until the Japanese flooded the US
market with disposable sets. I had to know what was in the box and what
made it tick, but then again, I just fixed them, not invented them, hi.
*********************************
I'm a technician, not a magician!
*********************************
73 de Warren, KB2VXA
e-mail: kb2vxa@juno.com
Message timed: 16:08 on 02 Jul 02 UTC
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