[time-nuts] HP 5061Cs reference question

paul swed paulswedb at gmail.com
Sat Dec 6 15:43:43 UTC 2014


Bob
Thanks.

On Sat, Dec 6, 2014 at 10:23 AM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> It’s a pretty small difference. The normal “tuning” (mag field)
> adjustments may be a bigger deal. A whole lot depends on the tube design. I
> *think* they are a measure of the transit time in the tube. It’s been about
> 30 years since I dug into that, so I could easily be a bit confused there ….
>
> Bob
>
> > On Dec 6, 2014, at 10:15 AM, paul swed <paulswedb at gmail.com> wrote:
> >
> > Bob
> > Thanks but can you actually see that on the frequency out at 5 Mhz.
> > If on the wrong transition or peak shouldn't that translate into an
> offset
> > also.
> >
> > On Sat, Dec 6, 2014 at 10:04 AM, Bob Camp <kb8tq at n1k.org> wrote:
> >
> >> Hi
> >>
> >> Sure you can set them on the wrong peak. If you really get confused, you
> >> can also set them on the wrong transition … (gulp).
> >>
> >> Peak wise, the one you want is the highest Q / best SNR. Set it to one
> of
> >> the others and your ADEV degrades.
> >>
> >> Transition wise … not a good idea at all.
> >>
> >> Bob
> >>
> >>> On Dec 6, 2014, at 9:11 AM, paul swed <paulswedb at gmail.com> wrote:
> >>>
> >>> I have a curious question that really applies to all Cs references.
> >>> Its possible to set them on to the wrong peak.
> >>> Typically in the literature it will speak to at least 3 peaks and you
> >> want
> >>> to select the highest central peak.
> >>> However if you select the wrong peak, how much would the output
> frequency
> >>> be off?
> >>> I had read a tech note for the airforce that seems to indicate its
> pretty
> >>> easy to get on to the wrong peak.
> >>> Regards
> >>> Paul
> >>> WB8TSL
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