[time-nuts] Dual GPSDO - any advantage?

Bob kb8tq kb8tq at n1k.org
Tue Apr 10 11:08:18 EDT 2018


Hi

I certainly would not pay with anything other than PayPal. There is a very
real risk …..

Bob

> On Apr 10, 2018, at 10:32 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
> 
> *No trees were harmed in the sending of this mail. However, a large number
> of electrons were greatly inconvenienced.*
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