[time-nuts] Dual GPSDO - any advantage?

donald collie donaldbcollie at gmail.com
Tue Apr 10 11:56:37 EDT 2018


I have the Chinapost tracking numbers, so I don`t think it`s a scam - just
real good value. I have the eBay guarantee, anyway. I`m just looking for a
superior frequency standard at the moment, but the timenut bug might bight.
How could I take the average of two [now three]. A man with three watches.
. . .     Cheers!... Don C.

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On Wed, Apr 11, 2018 at 2:32 AM, Clint Jay <cjaysharp at gmail.com> wrote:

> Ahh, I've found the listing, has anyone received one?
>
> I hate to say this but I'm highly sceptical that they will ever turn up,
> looks and smells very much like the standard eBay scam to me.
>
>
>
>
>
> On 10 April 2018 at 14:52, Bob kb8tq <kb8tq at n1k.org> wrote:
>
> > Hi
> >
> > Simple answer is that the “simple” approaches don’t do much to improve
> > things.
> > Errors are indeed un-correlated, even off of the same antenna. You
> *could*
> > average the result off of the two. That might improve things by sqrt(2).
> My
> > experience is that the bumps and lumps (when they do occur) are not the
> > sort
> > of thing that averages out nicely…..
> >
> > Bob
> >
> > > On Apr 10, 2018, at 1:43 AM, donald collie <donaldbcollie at gmail.com>
> > wrote:
> > >
> > > I`ve just bought two GPSDO`s from China @ US$9-50 each [This is not an
> > > error!] They are stated as being new, and use a Trimball dual oven
> OCXO.
> > I
> > > plan to run these in parallel [2 antennas, 2 feedlines, and 2 GPSDO`s]
> > It`s
> > > been said that a man with two watches is never happy - unless, of
> course,
> > > they agree with each other ;-). Being identical the outputs should be
> > > coherent, unless one becomes faulty [one advantage of having two - any
> > > discrepancy and you know something must be wrong]], but is there some
> > > crafty way I can squeeze a little more "accuracy" out of two than if I
> > only
> > > used one?
> > > TIA for your comments......................
> ......................Donald
> > > Brett Collie ZL4GX
> > >
> > > PS : I have no connection to the eBay seller. The US$9-50 seems to
> > include
> > > a basic puck antenna, long downlead, and 4 interseries adaptors
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>
>
> --
> Clint. M0UAW IO83
>
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> of electrons were greatly inconvenienced.*
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