[time-nuts] "Piezo Little Wonder" OCXO

Björn Gabrielsson bg at lysator.liu.se
Fri May 30 13:32:43 EDT 2008


Bill,

I have not seen 10.23MHz external freq input on commercial receivers.
But I have two ancient (ca 1991) Magnavox GPS Engines. (As seen on page
23 in pdf below.)

    http://www.rms-ion.org/Presentations/Dual-Use%20GPS.pdf

These are running on 10.23MHz XOs. One (of too many) future projects
involve cutting the internal freq trace and connect the 10.23MHz Piezo
80811 clone instead. Also have an FTS2000 ocxo running at 10.23MHz.

However I imagine the OPs 10.238MHz, beeing 800Hz high will mess up an
RF frequency plan laid for 10.23MHz sharp.

--

   Björn

 
On Fri, 2008-05-30 at 09:56 -0700, WB6BNQ wrote:
> Brooke,
> 
> That would imply that this 10.23 MHz ocxo could be used in place of a GPS receiver's
> oscillator and some additional circuitry to form a LOOP.  Then divide by 1023 for a
> reference frequency to another loop with a sine-wave oscillator as the house
> standard.
> 
> I have seen the above suggested before on this forum.  However, I do not know what
> receiver would fit the scenario.
> 
> Bill....WB6BNQ
> 
> 
> Brooke Clarke wrote:
> 
> > Hi Rick:
> >
> > 10.23 MHz shows up in the ICD-200 spec on how the GPS signal is generated.
> >
> > I've got a GPS sig gen see:
> > http://www.prc68.com/I/5001A.html
> > http://www.prc68.com/I/5001Bot.html
> > and it has an HP 10.23 MHz oscillator.
> >
> > Have Fun,
> >
> > Brooke Clarke
> > http://www.prc68.com/P/Prod.html  Products I make and sell
> > http://www.prc68.com/Alpha.shtml  All my web pages listed based on html name
> > http://www.PRC68.com
> > http://www.precisionclock.com
> > http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam
> >
> > Richard (Rick) Karlquist wrote:
> > > Early GPS receivers used a 10.23 MHz time base.
> > > Probably related to 2^10-1.
> > > Some GPS manufacturers approached HP about making
> > > a 10811 on 10.23 MHz.  There is a circuit modification
> > > for 10.23 MHz and some crystals were made (I
> > > have some somewhere).  However, I don't believe
> > > any 10.23 MHz 10811's were sold.  This unit was
> > > probably intended to meet the need not filled by HP.
> > >
> > > Rick Karlquist N6RK
> > >
> > > Randy Leifer wrote:
> > >> This is surplus item I found.
> > >> Piezo Crystal Company
> > >> "Piezo Little Wonder"
> > >> model # 2910007-27
> > >>
> > >> Does anyone know the pin-outs (see photo/link)?
> > >> What is a the freq 10.238 MHz used for ?
> > >> There is a trim pot, but I doubt it will trim away
> > >> 238k to get to 10MHz.
> > >>
> > >> http://i5.photobucket.com/albums/y177/Midiot/DSCN3364.jpg
> > >> http://i5.photobucket.com/albums/y177/Midiot/DSCN3366.jpg
> > >>
> > >> THANKS !!
> > >>
> > >> =Randy=
> > >>
> > >>
> > >>
> > >>
> > >>
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