[time-nuts] Why these Crystal Frequencies?

Alan Melia alan.melia at btinternet.com
Thu Dec 15 14:37:51 EST 2011


....and the one right at the bottom 1.4204058 GHz  is the atomic hydrogen
"rest frequency" to those of us with a vague interest in Radio astronomy
:-))

Alan G3NYK

----- Original Message ----- 
From: "Brooke Clarke" <brooke at pacific.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Thursday, December 15, 2011 3:13 AM
Subject: [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
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> >> received.
> >>
> >>
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