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

gign...@gmail.com said: > Those traco power units are fantastic. Absolutely great. I first encountered power "bricks" 10 or 15 years ago. They come in various sizes. Full brick, half-brick, and quarter-brick were common when I was watching, with the usual blizzard of output voltages. They

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

How did you find the units that will act as a UPS, without buying everything on the market and testing them? I just checked all of those bricks in our house, and none will do it. There are a couple of PNY units that do not provide output power until a button is pressed, and don't charge until

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

In message <20151013225202.1e70a...@aluminium.mobile.teply.info>, Florian Teply writes: >DC-DC converters with very >good efficiency exist for quite some time now. The one I just put in my HP5065A does 60W with 90+% efficiency in a 2x1x.5 inch package:

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

I’ve used Anderson PowerPoles in mixed voltage environments successfully. A visual indication can be obtained by using other colors for the connector shell; e.g., red for +13 Vdc and blue for +25 Vdc… One can also re-orient one of the connectors in each pair by 90º or 180º to create a physical

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

On Wed, 14 Oct 2015 06:34:39 +, you wrote: >They're quite neat, but I wish there were something a little less >heavy-duty for the 1-2 Amp range. For the small stuff, I use the little round plugs that come in a bunch of sizes; I've tried to standardize my shack on 5.5X2.5mm for things like a

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

Depending on your actual power throughput needs- PTCs can be a challenge as Bob mentions. You will have a tough time meeting the power requirements of a Thunderbolt with many you'll see. Now efuses (think TPS24/25xxx) or mosfets with a controller (think LTC43xx) can be a good choice but don't

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

Hi > On Oct 14, 2015, at 2:34 AM, Poul-Henning Kamp wrote: > > > In message <20151013225202.1e70a...@aluminium.mobile.teply.info>, Florian > Teply > writes: > >> DC-DC converters with very >> good efficiency exist for quite some time now. > > The one I just put

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

Those traco power units are fantastic. Absolutely great. For smaller applications Murata makes 3W ones quite similar and Wurth Electronik is also in that market. On Wed, Oct 14, 2015 at 12:00 PM Poul-Henning Kamp wrote: > > In message

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] 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] UPS for my time rack

lt;time-nuts@febo.com>; "Bill Byrom" <t...@radio.sent.com> Sent: Monday, October 12, 2015 11:44 PM Subject: Re: [time-nuts] UPS for my time rack > > In message > <1444701906.379459.408467601.5676d...@webmail.messagingengine.com>, > Bill Byrom writes: &

[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] 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

Message - From: "Poul-Henning Kamp" <p...@phk.freebsd.dk> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>; "Bill Byrom" <t...@radio.sent.com> Sent: Monday, October 12, 2015 11:44 PM Subject: Re: [time-n

[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

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

My apologies in advance for further putting tension on this OT thread, but one of the great stories from the early days of Usenet concerned a really large UPS system for a data center. In the late 80s the Digital Equipment Corp VAX computer was among the most powerful you could buy. If you can

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

Where I live, there are two problems. Frequent long outages. Solved with a natural gas standby generator, which has run several times in anger for extended periods since installed. (Vulnerable supply, low priority for restoration.) The bigger problem is transients. On a good night, my

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

On 10/11/2015 12:07 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > Essentially the charging circuits are not designed to run as long as needed > to charge big batteries. Even on ones designed for external batteries, > there's a recommended limit on the size of them. So if you think you might

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

Good morning all, On 10/10/2015 5:07 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: I was thinking of doing the same a while back, and intended getting a UPS and adding a large external battery pack, so if the mains failed late at night, I could run the GPS receiver and a few other things

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

Hi Unless you live in an unusual location, long term power outages are going to be pretty rare. At the house I’m now in, we had a high voltage feed that was on it’s last legs. We had short outages on a “many times a week” basis if the wind was blowing at all. We had rare outages in the > 5

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

-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. >>> David Kirkby (Kirkby Microwave Ltd) >>> Sent: Saturday, October 10, 2015 6:07 PM >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] UPS for my time rack &g

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

Hi If your problem is transients, from lousy power companies or from lighting on your power line, there are ways to address that. High voltage at the service line into the building should be fixed at the point the line comes in. If you don’t, then you get into all sorts of neat “transient went

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

Did the transient suppressors, too. A few years ago in a severe winter storm, after we got the neighbor's house on generator, his furnace still wouldn't work -- furnace brain fried. Took the repair guy 4 hours to make 20 minute trip . . . . my surge suppressors went in a week later. One

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

:07 PM >>>> To: Discussion of precise time and frequency measurement >>>> Subject: Re: [time-nuts] UPS for my time rack >>>> >>>>> On 10 October 2015 at 14:20, Chris Waldrup <kd4...@gmail.com> wrote: >>>>> >>>&g

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

Yes this is a complex topic. At one point in my career when I was responsible for the up time of several data centres for a high tech firm I had an Electrical Engineer on my team to (amongst other roles) work thru the various issues pertaining to UPS systems. I recall there were significant

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

I'm fortunate that several of pieces of my time nuts gear (including two of my ocxo's) feature backup 24 volt dc power inputs. They were the only things in my house that stayed running during a recent 2 day power outage while I was away. I have two large 12 volt gel cells in series that I re

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

On Sat, Oct 10, 2015 at 9:20 AM, Chris Waldrup wrote: > Has anyone had bad experience noise wise with the APC brand units like are > available on Amazon and at Staples? I'd like to get one that doesn't > generate lots of RFI. I have an inexpensive CyberPower 825 AVR UPS, The

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

attery out and back to its own charger. >> >> Bob >> >>>>> -Original Message- >>>>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. >>>>> David Kirkby (Kirkby Microwave Ltd) >>>>> Sent: S

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

In message <183218108.6a07c91c@Nodemailer>, "Chris Waldrup" writes: >Has anyone had bad experience noise wise with the APC brand units >like are available on Amazon and at Staples? I'd like to get one >that doesn't generate lots of RFI. Thank you.  Then don't. Instead get 12 or 24

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

Hi over the last 10 years or so I've purchased several consumer / small office grade UPS's from sources such as Staples and Costco. I've never noted any RFI from them but I live in a (rf) noisy urban neighbourhood so any noise they put out is probably hard to notice. Other than occasionally

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

Hi All of the UPS vendors these days make a wide range of products. They range from low cost to mighty expensive. They also range a bit in terms of performance. Finding out exactly what this or that model *does* do can be a major pain. The marketing guys apparently don’t want you to figure

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

Hi If you do *any* VLF, then anything with an inverter in it is going to be a potential disaster. It will purely be a case of the inverter being at a frequency that bugs you right now. None of the ones I have seen are tightly controlled in frequency. What they do today probably will not be

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

for a very similar application I am using a solar panel to charge the battery, but I have a vented NiFe battery, which is not sensitive of over charging or deep discharging, and has almost unlimited life time -- I have seen some in forklifts which were 60 years old and working... 73 KJ6UHN

[time-nuts] UPS for my time rack

Hi, I have decided I'd like to get a UPS to put on the rack containing my Thunderbolt, the laptop that runs Lady Heather, and frequency counter.  Has anyone had bad experience noise wise with the APC brand units like are available on Amazon and at Staples? I'd like to get one that doesn't

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

Hi, Thanks for the comments this morning.  I'm not looking for something huge, maybe in the under $200 range. Just enough for the Thunderbolt, laptop, and Agilent 53131A counter. I'd like a little headroom though, as I may add another Thunderbolt or a rubidium standard someday.  I do like

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

A quick comment about "pure sine" devices. At times I operate a portable VHF and up radio system from rf quiet out of the way places. I run almost all the equipment from lead acid storage batteries. I have small 30 dollar inverter I use to occasionally power some equipment that needs 120

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

I have 3 APC SmartUPS2200NET UPSs. I have detected no interference to my HF ham station from these. One antenna is several hundred feet away; another passes less than 10 feet away. I have listened to these with an IC-R10, and not found much noise. I get much more from noise radiated by

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

Chris Waldrup kirjoitti: I have decided I'd like to get a UPS to put on the rack containing my Thunderbolt, the laptop that runs Lady Heather, and frequency counter. Has anyone had bad experience noise wise with the APC brand units like are available on Amazon and at Staples? I'd like to get

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

Just to add to this. I've also been told that other pure sine inverters have worked well for others in similar applications. Not sure if mine was unusually bad or the frequencies it operated on happened to be related to the frequencies I was using. Your success may vary. Best regards

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

ack directly to the line. This allowed the UPS to be replaced when its warranty ran out. Batteries lasted six years, did not invest another $500 in them. Good luck. Bill Hawkins -Original Message- From: Chris Waldrup Sent: Saturday, October 10, 2015 8:20 AM To: TIme Nuts Subject: [time-nuts]

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

On 10 October 2015 at 14:20, Chris Waldrup wrote: > Hi, > > > I have decided I'd like to get a UPS to put on the rack containing my > Thunderbolt, the laptop that runs Lady Heather, and frequency counter. > There's one issue with them that I don't see anyone mention. I was