What's the advantage of that solution over the GPS' 1 part in a billion
accuracy and more importantly, what assurances do you have relating to
accuracy and stability without lab-grade test equipment?
At least with a GPS-based reference, I can leave that worry to someone
else....like the U.S. military.
Paul, W9AC
----- Original Message -----
From: "Bill Fuqua" <wlfuqu00@uky.edu>
To: <tentec@contesting.com>; <tentec@contesting.com>
Sent: Wednesday, June 04, 2003 9:49 AM
Subject: Re: [TenTec] Some Observations on Orion Stability/Calibration
> For about $500 you can buy a new in the box Rubidium Atomic Frequency
standard.
>
> 73
> Bill wa4lav
>
>
> At 09:13 AM 6/4/2003 -0400, Paul Christensen, Esq. wrote:
> >This has given me some ideas for synchronizing signals around the shack,
> >including the use as an ultra-high stability reference for my RX-340.
The
> >stability of the RX-340 is exceptional, but I like the idea of never
having
> >to check and adjust frequency calibration ever again.
> >
> >I just ordered the set from www.buylegacy.com which includes the GPS
> >receiver, antenna and 48VDC power supply for about $350.00. Thanks Eric
> >(both of you!) for pointing this out.
> >
> >-Paul. W9AC
> >
> >----- Original Message -----
> >From: "Eric F. Richards" <efricha@dimensional.com>
> >To: <tentec@contesting.com>
> >Sent: Tuesday, June 03, 2003 22:14 PM
> >Subject: RE: [TenTec] Some Observations on Orion Stability/Calibration
> >
> >
> > > At 09:30 PM 6/3/2003 -0400, Eric Scace K3NA wrote:
> > > > If folks are particularly interested in frequency accuracy, a
recent
> > > > issue of "QEX" discussed how to setup a GPS-slaved time &
> > > >frequency standard. A readily available surplus unit (used in the
> > > >cellular telephone industry) was featured in the article. The
> > > >unit provides a high-accuracy 10 MHz signal and time-of-day. These
have
> > > >been advertised in "QST" and "QEX" for about $265 over the
> > > >last year or so. Achieving a stable and accurate local standard
based on
> > > >this little rack-mount box would be much easier than
> > > >WWV-based solutions.
> > >
> > > I use one of these with my RX-340, where it literally is a plug-n-play
> > > solution.
> > >
> > >
> > > > A very ambitious person would devise a system for slaving the
Orion
> > > > TCXO to an external 10 MHz standard.
> > > >
> > > > I have used double-oven 10 MHz local standards (also retired from
the
> > > > telecommunication industry) whose accuracy was tracked
> > > >against WWVB at 60 kHz with a chart recorder. This approach is
accurate
> > > >enough to observe the daily aging rate of the crystal
> > > >(after a few days of measurements). A WWVB-based calibration
mechanism
> > > >would also be quite accurate, but it does require a recorder
> > > >and more time. The GPS-slaved system is much faster, which is why it
is
> > > >in common use today.
> > > >
> > > >-- Eric K3NA
> > >
> > > This receiver seems to be a single oven but is highly accurate and has
> > > low phase noise. Software beyond the basic SCPI command set can be
found
> > > at http://www.realhamradio.com/gpscon.htm to control as well as chart
> > > accuracy over time.
> > >
> > > The receiver itself is available from www.buylegacy.com and at $249 is
> > > a no-brainer when compared to the $4k rig it is used with. The manual
> > > is online at buylegacy.
> > >
> > > Eric
> > >
> > > --
> > > Eric F. Richards
> > > efricha@dimensional.com
> > > "The weird part is that I can feel productive even when I'm doomed."
> > > - Dilbert
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> >
> >_______________________________________________
> >TenTec mailing list
> >TenTec@contesting.com
> >http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
|