[time-nuts] Dual GPSDO - any advantage?

[Bob kb8tq]

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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