[time-nuts] Why these Crystal Frequencies?
Heinzmann, Stefan (ALC NetworX GmbH)
Stefan.Heinzmann at alcnetworx.de
Thu Dec 15 05:54:19 EST 2011
13.5 and 27 MHz are usually associated with digital video. SD video with 720 x 576 has a pixel clock of 13.5 MHz, and the corresponding SDI bit clock is 270 MHz.
Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] Im Auftrag von Brooke Clarke
Gesendet: Donnerstag, 15. Dezember 2011 04:13
An: Discussion of precise time and frequency measurement
Betreff: [time-nuts] Why these Crystal Frequencies?
Maybe you can shed some light on the common xtal frequencies table where there's no explanation given?
An answer is not it's an "even" frequency or "it's an even binary frequency. That's true for most of these and the factors are part of the table above.
The question is why do they exist?
Peter Bell wrote:
> It's exactly 52 times the 1.2288MHz reference that IS95/CDMA2K uses -
> this may be a coincidence, but I somehow doubt it.
> On Thu, Dec 15, 2011 at 3:46 AM, Joe Leikhim<JLeikhim at leikhim.com> wrote:
>> I have been watching this thread and may have missed something. My
>> questions: What is the purpose of the outboard OCXO VECTRON
>> 63.8976Mhz? What model number does this RB most closely resemble?
>> Joe Leikhim
>> Leikhim and Associates
>> Communications Consultants
>> Oviedo, Florida
>> JLeikhim at Leikhim.com
>> Note to GMail Account users. Due to an abnormally high volume of spam
>> originating from bogus GMail accounts, I have found it necessary to
>> block certain GMail traffic. Please phone me if you believe your
>> message was not received.
>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
>> and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
> and follow the instructions there.
time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the time-nuts