[time-nuts] Different Thunderbolt versions

[Bruce Griffiths]

SAIDJACK at aol.com wrote:
> Hi Bruce,
>  
> seems that would be in line with extending the 10s plot down to 1s in a  
> linear fashion.
>  
> Not that great. Tom's GPSDO measurements show some GPSDO's go down to  ~E-013 
> at 1s.
>  
> bye,
> Said
>  
>  
> In a message dated 2/25/2009 12:33:22 Pacific Standard Time,  
> bruce.griffiths at xtra.co.nz writes:
>
> Said
>
> Specified Allan deviation is 2E-11  @1s.
>
>
> Bruce
>
>   
That isnt a great advantage in this application given that the
contribution of the ionosphere to the VLBI receiver output signal phase
noise is around 8E-11 @ 10s at 50MHz.
Typically in VLBI integration times op up to 10,000 seconds or more are
used. Integration times shorter than 100 sec are not usually of much
interest.

Bruce