[time-nuts] Re: Denmark in the Century of the fruitbat

[Jeremy Nichols]

What is “John’s CPU upgrade” for the HP-5370B? Maybe I need one of those.

Jeremy



On Wed, Jan 25, 2023 at 12:57 PM Poul-Henning Kamp via time-nuts <
time-nuts at lists.febo.com> wrote:

> As some of you may recall, legal time in Denmark is "the mean solar
> time of the 15th eastern longitude", because nobody got around to
> update the "Law of Time" from 1893 which said so.
>
> (See also: https://www.youtube.com/watch?v=yRz-Dl60Lfc)
>
> Today, finally, the government proposed new law which says which
> will say:
>
>         "Danish normal time will follow UTC plus one hour"
>
> If ratified, the law will take effect on March 26 2023 at 02:00.
>
> The law does not say if 02:00 is according to the old or the new
> law, which according to current Bulletin A will differ by 22.68
> milliseconds by then.
>
> Related to this, the Danish Institute of Fundamental Metrology
> received a grant last year to implement and distribute this new
> legal timescale and to contribute it to BIPM.
>
> DFM went shopping at T4, and have spent half a year getting to know
> their new maser, which they now report to BIPM as UTC(DFM):
>
>
> https://webtai.bipm.org/ftp/pub/tai/Circular-T/cirthtm/cirt.420.html
>
> At some point soonish, they will also start to distribute their
> timescale with NTP and PTP, at which point my 25 year long career
> as unofficial danish provider of illegal time will come to an end.
>
> Related to that I note with some sadness, that my own time-nut
> activities have taken a back-seat to my involvement in datamuseum.dk.
>
> As a result, I am starting feel a bit guilty about "hoarding"
> time-nut kit, which I never find time do something with, and will
> therefore entertain fair offers from fellow time-nuts on:
>
> one HP5065
>     Has been running continuosly for five years.
>
> one HP5065
>     Probably works.
>     The synthesizer has been "repaired" by replacing it with a small
>     microcontroller to produce the correct frequency, but I have
>     not had it running for a long time with that repair.  Has been
>     powered off for the last three or four years.
>
> One HP5370B
>     With Johns CPU upgrade
>
> One HP5359A
>     Does not seem to start now.  It used to.
>
> FE408 (15MHz)
>
> Austron 1150 OCXO (5MHz)
>     Worked last I used it.
>
> IsoTemp OCXO118-20
>     9.999933 MHz - (DMTD candidate!)
>
> Send me private email if you are interested...
>
> Poul-Henning
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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>
-- 
Jeremy Nichols
Sent from my iPad 6.