[time-nuts] Why these Crystal Frequencies?

Brooke Clarke brooke at pacific.net
Wed Dec 14 22:13:10 EST 2011


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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