Re: [time-nuts] UPS for my time rack

Hi One option for the “fuse” part of the DC supply system are PTC resettable fuses. You *do* indeed need to be careful about voltage and current ratings on these gizmos. If the only objective is to “not have smoke” when there is a short, that can reduce the variables to a manageable level. If

Re: [time-nuts] UPS for my time rack

In message <1444701906.379459.408467601.5676d...@webmail.messagingengine.com>, Bill Byrom writes: >Anything can (and will) fail, [...] The interesting thing is that several sources in that business have reported to me that about 30-40% of all power related downtime is caused by

Re: [time-nuts] Trimble Thunderbolt and David Partridge divider boardquestion

I believe the author was looking into modifying his circuit to use a LTC6957 as a frontend. Not sure if he ever got around to it. https://www.febo.com/pipermail/time-nuts/2015-May/092138.html -=Bryan=- > From: t...@leapsecond.com > To: time-nuts@febo.com > Date: Mon, 12 Oct 2015 08:31:17

Re: [time-nuts] Trimble Thunderbolt and David Partridge divider boardquestion

Hello, on 13/10/2015 14:41 you wrote: > I believe the author was looking into modifying his circuit to use > a LTC6957 as a frontend. Not sure if he ever got around to it. > https://www.febo.com/pipermail/time-nuts/2015-May/092138.html > -=Bryan=- Hi Bryan, now sorted, I have done some

[time-nuts] Symmetricom 58534A-H01, NOS surplus (eBay)

Surplus Ericsson GPS Timing Antennas (58534A), new in box, have appeared on eBay -- at a significant reduction in price (compared to used units sold from China). Item number: 111702246202 Seller is located in Austin, TX (USA) Symmetricom 58534A GPS Timing Antenna (circa 1998) Integrated GPS

Re: [time-nuts] UPS for my time rack

In message <4FD0F30EBAEF49609DF207E3EE61C15B@pc52>, "Tom Van Baak" writes: >I used to rely on one massive UPS (along with natural gas generator) >for my entire lab. Eventually I found it more reliable and convenient >to have localized power backup. By local I mean backup for a single

Re: [time-nuts] Symmetricom 58534A-H01, NOS surplus (eBay)

In message , Gregory Beat writ es: >Surplus Ericsson GPS Timing Antennas (58534A), new in box, >to convert the RS-422 to RS-232 and provide a 1 pps output. I've used Synergy GPS's version for some NTP servers and there is one little

Re: [time-nuts] UPS for my time rack

I found this UPS article fascinating, because it echoed what I eventually found in my own lab: http://www.theplatform.net/2015/03/13/how-this-battery-cut-microsoft-datacenter-costs-by-a-quarter/ I used to rely on one massive UPS (along with natural gas generator) for my entire lab. Eventually

[time-nuts] UPS for my time rack

A winning way to do 12v and 24v wiring up to 45Amps are Anderson Powerpole connectors. Many sources sell fused distribution panels. For larger currents (up to 350A) the SB "Storage Battery" series is broadly used in Forklifts and solar applications Tim N3QE On Tuesday, October 13, 2015,

Re: [time-nuts] Rohde & Schwarz GPSDO

Hi, On 10/07/2015 04:06 AM, Bob Benward wrote: If anyone is interested, a Rohde & Schwarz GPSDO: Rohde & Schwarz GPS RECEIVER ED170MP MEINBERG 2105.5504.00 http://www.ebay.com/itm/262081245211?_trksid=p2055119.m1438.l2649 =STRK%3AMEBIDX%3AIT Ok, who is the lucky winner that out-bid me with

Re: [time-nuts] UPS for my time rack

Sorry for a somewhat Non time nuts posting but this topic seems to have drawn a lot of interest. I found the Microsoft article fascinating. Thanks for sharing. Re DC power. I've seen some computing equipment that ran from -48 volts DC but to expand on the comments from PHK about DC power

Re: [time-nuts] UPS for my time rack

Am Tue, 13 Oct 2015 18:54:58 + schrieb "Poul-Henning Kamp" : > > In message <4FD0F30EBAEF49609DF207E3EE61C15B@pc52>, "Tom Van Baak" > writes: > > > >I used to rely on one massive UPS (along with natural gas generator) > >for my entire lab. Eventually I found it

Re: [time-nuts] UPS for my time rack

Hi Poul: I really like Power Pole connectors. Unlike cigarette lighter plugs and sockets where the spring causes them to separate on their own the Power Pole connectors "snap" together. The Amateur Radio Emergency Services (ARES) used to use car trailer connectors but long ago switched to

Re: [time-nuts] UPS for my time rack

Hi Tom: The Li-Ion 18650 size cells (18mm dia x 650mm long) are used in most laptop computer batteries and Tesla cars because they are made in such high volumes. The referenced article shows a single 18650 cell, but with about 3.7 Volts per cell you need to connect them in series and/or

[time-nuts] UPS for my time rack

How could anybody possibly accept/consider/use a VAX/Unix as a solution to any real computer problem? The manual set only takes 3 feet of shelf space. Anybody knows that a real (IBM) computer requires 80+ feet of documentation. Or so I was once scolded by the management of a Very Large