[time-nuts] Ebay FE-5680A Rb

Azelio Boriani azelio.boriani at screen.it
Wed Dec 14 17:44:23 EST 2011


The 63.8976MHz frequency seems to be related to the OFDM frame of the WiMAX
standard that has a window of 62400 bytes and the 63.8976MHz can time WiMAX
BaseStations with only powers-of-2 dividers.

On Wed, Dec 14, 2011 at 11:24 PM, paul swed <paulswedb at gmail.com> wrote:

> Could be but as a timenut not real magical to me either.
> Regards
> Paul
>
> On Wed, Dec 14, 2011 at 5:06 PM, Javier Herrero <jherrero at hvsistemas.es
> >wrote:
>
> > I'm begin getting curious... having already received that OCXO, and with
> a
> > 2nd unit arriving... I've googled the frequency and there are about a
> > zillion cristals and oscillators for that frequency from a ton of
> different
> > manufacturers, and seems that the frequency is patented: US patent
> 6282184
> > (well, I suppose that not exactly the frequency is what it is patented,
> > but...):
> >
> > " The digitizing rate of the A-D converter 41 preferably set for this
> > example to 63.8976 MHz is carefully selected, as described in detail
> below,
> > to eliminate the need for additional expensive and complex signal
> filtering
> > and shielding that would otherwise be required in the RX channelizer
> banks
> > 7, 8, 9 for simultaneously processing the digitized signal received by
> the
> > A-D converter 41 at the common digitizing rate based on their respective
> > CDMA, TDMA and GSM requirements "
> >
> > So... this seems to be the magic about this frequency (and the reason
> that
> > these sellers has enough of them for sameless give them away)
> >
> > Regards,
> >
> > Javier
> >
> >
> > El 14/12/2011 22:41, Pete Lancashire escribió:
> >
> >> I'd agree. If you google the frequency there is a lot of surplus out
> >> there and unless
> >> you building your own cell system I can't think of any use .. yet :-)
> >>
> >> On Wed, Dec 14, 2011 at 11:53 AM, Chuck Harris<cfharris at erols.com>
> >>  wrote:
> >>
> >>> I would say that he has a gadzillion of the OCXO's, recognizes that the
> >>> frequency
> >>> is useless, and would rather give them away, generating a little
> >>> synthetic
> >>> good will,
> >>> than scrap them.
> >>>
> >>> -Chuck Harris
> >>>
> >>>
> >>> Joe Leikhim 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?
> >>>>
> >>>>
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