[time-nuts] Re: What's the best HP OCXO for frequency counter reference?

[Adrian Godwin]

Related to that ..

If you use the ovened oscillator for temporary use away from the home
GPSDO, how good will the oscillator be with those interruptions to power /
temperature, and will it stabilise during the period you're using it there ?

I don't know what the vales are, but I'd suggest the option 010 will never
reach the 001's spec and the 001 may not even be justified.



On Tue, Jun 28, 2022 at 6:13 PM Dr. David Kirkby via time-nuts <
time-nuts at lists.febo.com> wrote:

> I have a 5352B 40 GHz frequency counter which was fitted with a TCXO. I
> removed that and fitted an HP 10811-60111 S/N 2332A17049 which I removed
> from a 5370B time interval counter - I have a few of those, and the
> microwave frequency counter needed the oven more than the time-interval
> counter.
>
> Looking at the specification of the 5352B, there were 3 oscillator options
>
> * Standard TCXO
> * Option 001 Oven time based. Long-term aging < 5 x 10^-10 / day after 24
> hour warmup. < 1 x 10^-7 / year for continuous operation.
> * Option 010 High stability time base. Long term aging < 1 x 10^-10 / day.
> < 3.6 x 10^-8 / year for continuous operation.
>
> To be honest, when the instrument is here, I will use a GPS reference. But
> I might want to take it to the amateur radio club sometimes. I would like
> to get the best oscillator I can. Are any models going to be better than
> others, or by this time, is it just pot luck? I think it's the latter, but
> maybe some are double-ovens and some single.
>
> With the exception of power cuts of up to a few hours, the HP 10811-60111 I
> fitted has been continuously powered on for a few years. But due to soaring
> power costs, I am going to switch my ovens off.
>
> Dr David Kirkby Ph.D
> Email: drkirkby at kirkbymicrowave.co.uk Web:
> https://www.kirkbymicrowave.co.uk/
> Kirkby Microwave Ltd (Tel 01621-680100 / +44 1621-680100)
> Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT.
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