rec.arts.movies.production.sound

Sergio Sanmiguel wrote:

>>> Hey Guys,
>>> Thanks for all the input.
>>> I was looking in the 702T Users Manual and & found this:
>>> "24 Hour Run (mode):
>>> ...the generator will also re-jam if the time-of-day clock is reset.
>>> Once jammed, the generator will run continuously from the timecode
>>> clock, not the time-of-day-clock."
>>> The funny thing here is that when I enter the menu to reset the TOD
>>> clock it actually reads the current time. I mean, the TOD clock
>>> actually keeps better track of time better than the TC generator (as
>>> expected)
>>> Wouldn't it be useful if the TC generator could grab TOD clock & re-
>>> jam (actual time) after a couple of hours in order to display accurate
>>> TOD? Isn't this the way Boomrecorder generates TOD timecode?
>>> Thanks,
>>> Sergio
>> Sergio,
>>
>> I am curious, what frame rate is you TC generator set to?
>>
>> ---Matt
>
> Matt:
> At this time is set to since the last project require that.
> Do you think setting it at 30fps would drift the less?
>
> Ben:
> Wouldn't it drift anyways since the crystal would cause a 0,1 % drift
> by 8 hours?
>
>
> ~
> S

Sergio,

That is exactly why the timecode is drifting from time of day. At
, you are loosing 108 frames or approximately seconds an hour.

This was the whole reason behind the development of Drop Frame code. It
drops 108 frame numbers per hour to keep the timecode more or less in
sync with time of day.

Set your TC clock to any even frame rate (24,25,30) and it will stay in
perfect sync with time of day.

Oh, also that accuracy spec is .1 parts per million ( ) not .1%
(.001)

---Matt