From: "time-nuts-request@febo.com" <time-nuts-request@febo.com>

Yepp. That was a brilliant idea... ...until I realized that I needed 115V for the XO quick-heaterand we use 230V in Europe... So the SMPS splution will not work for me. I will use an old (dual primary winding) linear supply which has the advantage of providinga regulated 24V that can be used for the heater windings of the rubidiumcavity. Ulf - SM6GXV From: "time-nuts-request@febo.com" <time-nuts-request@febo.com> To: time-nuts@febo.com Sent: Friday, July 28, 2017 6:00 PM Subject: time-nuts Digest, Vol 156, Issue 35 Send time-nuts mailing list submissions to     time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit     https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to     time-nuts-request@febo.com You can reach the person managing the list at     time-nuts-owner@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics:   1. Re: 5065A - Looking for AC XFMR PAECO 9100-2742    specification       (paul swed) ---------------------------------------------------------------------- Message: 1 Date: Fri, 28 Jul 2017 11:21:51 -0400 From: paul swed <paulswedb@gmail.com> To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Subject: Re: [time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742     specification Message-ID:     <CAD2JfAidmsnw5SUdWgndGTdaSASGJi8CShUBgW166hu3gSRDoQ@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Poul I looked at your site and the power supply. That makes a lot of sense. Though I have not lost my transformer as Ulf has at least I see an answer that I can use. I would have come up with the same approach but you did the thinking for me. Thanks Paul WB8TSL On Thu, Jul 27, 2017 at 3:58 PM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message <675538475.428966.1501176257165@mail.yahoo.com>, Ulf Kylenfall > via t > ime-nuts writes: > > >Removing that board I discovered that the "24-32V" raw DC was some > >40 Volts. > > That's a bit on the high side, but not excessively so. > > HP tended to let the linear regulators shave a big slice in > precision instruments, probably to make sure that absolutely > no ripple makes it through. > > If I were you, I would ditch the transformer entirely, and go with > an external DC PSU and put a high-quality DC/DC converter in the > HP5065A > > See: > >        http://phk.freebsd.dk/hacks/HP5065A/20150930_dcdc/index.html > > > > -- > Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20 > phk@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. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ------------------------------ Subject: Digest Footer _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ------------------------------ End of time-nuts Digest, Vol 156, Issue 35 ******************************************

http://phk.freebsd.dk/hacks/HP5065A/20150925_ocxo_preheat/index.html

-------- In message <1826314051.766978.1501316001574@mail.yahoo.com>, Ulf Kylenfall via time-nuts writes: >That was a brilliant idea... >...until I realized that I needed 115V for the XO quick-heaterand >we use 230V in Europe... The quick-heater isn't that important, unless you are a very impatient person. It is also, as I understand it, the primary reason for fried out OCXOs... See also: http://phk.freebsd.dk/hacks/HP5065A/20150925_ocxo_preheat/index.html -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@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.