It’s in the K3XREF manual.  +4 to +16 dBm.  Your reference doesn’t have enough 
output.

Grant NQ5T

> On Nov 21, 2019, at 3:33 PM, Dave Sublette <[email protected]> wrote:
> 
> I have a K3s, delivered in January this year.  I am using an external GPS
> disciplined 10 Mhz reference to the External Ref input on the back.  I
> cannot find anywhere in the manual what the required level for this input
> is.  I have -1.1 dBm and it seems to work.  However, once in a while, the
> K3s frequency shifts down 10 hz, then back to the original frequency, then
> up 10 hz, then back to original frequency, all in a matter of two t four
> seconds.   This happens maybe once a week and lasts for a minute or two.  I
> have never heard it do more than one sequence of  down-back-up-back at
> time.
> 

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