[time-nuts] Ebay FE-5680A Rb

Pete Lancashire pete at petelancashire.com
Wed Dec 14 19:02:31 EST 2011


I use to have a reference to frequencies used by the different cell
systems. That's my
call .. and I can't think of another industry that just like the
Thunderbolts that when it
does a refresh or a fix from a design oh-shit dumps so many of the same thing.

I just read US Patent 6,282,184 "Common Digitizing Rate for Multiple
Air Interfaces
for Generic Cell Sites in Cellular Radio" .. it mentions it.as a base
frequency (11.37)

-pete

On Wed, Dec 14, 2011 at 2:44 PM, Azelio Boriani
<azelio.boriani at screen.it> wrote:
> 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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