[time-nuts] FE-5680A sweep range setting

Bob Camp lists at rtty.us
Sat Mar 1 14:01:23 EST 2014


I seem to recall that many of the bad transitions get ruled out for this or that reason. The number of “threats” isn’t as big as you might think. There is basically one close in transition and everything else is quite a bit further out. 


On Mar 1, 2014, at 1:48 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hi Bob,
> On 01/03/14 16:55, Bob Camp wrote:
>> Hi
>> I am not at all sure that a mid setting on the VCXO is really the right thing to do.
> It's not really the right thing to do. You should trim it to one end so that further continuous drift makes trimming time longer than putting it at the mid.
>> I’ve seen quite a few Rb’s from a number of manufacturers. They all seem to set up the
>> sweep process so it sweeps fairly far low but not very far high. There are multiple
>> quantum state transitions possible with a Rb. They may be trying to get the good one
>> and avoid a near by bad one.
> Since the nearby bad ones is evenly distributed around the central good one, your way of reasoning doesn't really work.
> Cheers,
> Magnus
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