[time-nuts] Why these Crystal Frequencies?

Brooke Clarke brooke at pacific.net
Thu Dec 15 15:06:31 EST 2011


Hi Azelio:

Sorry, a mistake.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html


Azelio Boriani wrote:
> 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
>>>>
>>>> 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.
>>>>
>>>>
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