[time-nuts] Why these Crystal Frequencies?

Azelio Boriani azelio.boriani at screen.it
Thu Dec 15 06:00:17 EST 2011


SD-SDI 270MHz, then there is the HD-SDI.
Brooke, the 77.503KHz you mention for the DCF77: are you sure the IF is
3KHz? 77.503KHz is 77.5KHz + 3Hz...

On Thu, Dec 15, 2011 at 11:54 AM, Heinzmann, Stefan (ALC NetworX GmbH) <
Stefan.Heinzmann at alcnetworx.de> wrote:

> 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.
>
> Cheers
> Stefan
>
> -----Ursprüngliche Nachricht-----
> 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?
>
> Hi Pete:
>
> Maybe you can shed some light on the common xtal frequencies table where
> there's no explanation given?
> http://www.prc68.com/I/pdf/Crystal_Freq.pdf
> 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?
> such as:
> 32.0 kHz
> 40.0
> 75.0
> 76.79
> 76.8
> 76.81
> 96.0
> 3.072 MHz
> 4.0
> 4.096
> 5.0
> 6.0
> 7.3729
> 8.0
> 8.192
> 9.8304
> 10.0
> 11.0
> 11.0592
> 11.2896
> 12.0
> 12.288
> 12.352
> 13.5
> 14.31818
> 15.36
> 16.0
> 16.384
> 17.734475
> 18.0
> 18.432
> 19.6608
> 19.44
> 22.1184
> 24.0
> 24.567
> 25.0
> 25.175
> 28.63636
> 30.0
> 1.4204058 GHz
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/Brooke4Congress.html
>
>
> 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.
> >
> > Regards,
> >
> > Pete
> >
> >
> > 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
> >>
> >> www.Leikhim.com
> >>
> >> JLeikhim at Leikhim.com
> >>
> >> 407-982-0446
> >>
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> >> originating from bogus GMail accounts, I have found it necessary to
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> >>
> >>
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