[time-nuts] Best choice for house 10MHz reference...??

George n4ua.va at gmail.com
Sun Jan 27 20:25:18 EST 2008


John Miles wrote:
> As unhappy as you may be to hear it, Mike, you're done upgrading, at least
> for now.  Thunderbolts are about as good as they get.  Yes, some units like
> the HP and Jackson Labs clocks can do somewhat better, and with
> entirely-different equipment, you might be able to tell.  Not with the 49xP
> analyzer, though.
>
> Your 497P is limited by its 1-Hz counter LSD, not the Thunderbolt.  1E-10
> accuracy from the Thunderbolt is 1 Hz at 10 GHz, and that's about what the
> Thunderbolt does at tau=1s, even though the spec sheet shows it closer to
> 1E-9 at t=1s.
>
> That means that there is no conceivable benefit to further upgrading the 10
> MHz reference beyond where you already are.  I know, I know, that's the
> worst news of all. :)
>
> Focus on giving the Thunderbolt the best signal you can, via antenna
> mounting.
>
> -- john, KE5FX
>
>   
And, if anyone out there still need a Thunderbolt (for less than the 
ebay price), I have a few more OEM units available.

73,

geo - n4ua



More information about the time-nuts mailing list