Re: [time-nuts] The home time-lab

And I will add a high voltage power resistor to limit the Q. On Fri, 8 Jul 2016 22:12:53 -0400, you wrote: >Hi > >If you try this, be very careful with the voltage at the junction of the L and >the C. > >Bob > >> On Jul 8, 2016, at 9:52 PM, David wrote: >> >> I wonder

Re: [time-nuts] Speaking clock

On 7/8/16 5:45 PM, Morris Odell wrote: Hi Bill, It uses a Votrax SC-01 speech synthesizer chip that I bought in a kit over 30 years ago to use with the Apple II. Hmm. I have a SC-01.. One could hook it up to a Arduino trivially. And run it on Mars time..

Re: [time-nuts] The home time-lab

Be aware that operating CVTs at low loading (wrpt their rated load) will usually result in a low power factor. The nature of the load will influence this as well. DaveB, NZ - Original Message - From: "Bob Stewart" To: "Brooke Clarke" ; "Discussion

Re: [time-nuts] The home time-lab

Hi If you try this, be very careful with the voltage at the junction of the L and the C. Bob > On Jul 8, 2016, at 9:52 PM, David wrote: > > I wonder how well a pair of high voltage transformers wired back to > back with a 60 Hz series resonate LC circuit between them

Re: [time-nuts] The home time-lab

I wonder how well a pair of high voltage transformers wired back to back with a 60 Hz series resonate LC circuit between them would work for removing power line glitches. They wouldn't do anything for voltage regulation unlike a constant voltage transformer though. Time to break out a couple of

[time-nuts] Speaking clock

Hi Bill, It uses a Votrax SC-01 speech synthesizer chip that I bought in a kit over 30 years ago to use with the Apple II. The processor in this clock is an Atmel Mega-32 AVR and it gets its timing reference from the mains frequency. There's room to add a GPS receiver in future and make it

Re: [time-nuts] The home time-lab

Tim wrote: > I strongly disagree. > What happens, is you have transformers, fluorescent ballasts, and motors * * * in the vicinity of your lab equipment. * * * not even necessarily in the same room * * * every time there's a sudden power cut, a large back-EMF develops and then the

Re: [time-nuts] The home time-lab

That has been my experience over the last 25 odd years... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 7/8/2016 5:37 PM, Charles Steinmetz wrote: > The usual problem is glitches on the on-site AC mains supply, and > properly designed and installed on-line UPS

Re: [time-nuts] The home time-lab

Bob wrote: OK, you pushed me over the edge. I ordered a Sola 63-23-210-8. Hum Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] The home time-lab

You do what you can do... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 7/8/2016 1:27 PM, Tim Shoppa wrote: > Everyone else is talking as if these blips can be protected from, by having > a UPS supplying your precious lab equipment. > > I strongly disagree. > >

Re: [time-nuts] The home time-lab

Hi Tim, I've learned a lot from the responses to my original post.  I had almost come to the conclusion that a UPS wasn't going to do it for me before I started this.  Unfortunately, I can't afford to have a Generac running 24/7, so I was hoping for alternatives.  The idea of an inverter type

Re: [time-nuts] The home time-lab

Best bet is to get 4 6v deep cycle batteries connect in series and connect a high quality power supply capable of supporting planned load and set output voltage to the selected 'float' voltage This will give you a setup which depending on batter rating could give you several days of backup

Re: [time-nuts] The home time-lab

Everyone else is talking as if these blips can be protected from, by having a UPS supplying your precious lab equipment. I strongly disagree. What happens, is you have transformers, fluorescent ballasts, and motors (e.g. HVAC blowers) in the vicinity of your lab equipment. Probably on a

Re: [time-nuts] The home time-lab

OK, you pushed me over the edge.  I ordered a Sola 63-23-210-8.  Hopefully it'll do enough for most of the problems. Bob  - AE6RV.com GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info From: Brooke Clarke

Re: [time-nuts] The home time-lab

I also have had good results with various APC UPS systems. I typically have to replace the batteries in my UPS's and my stand alone backup batteries every 5 to 7 years or so. Units such as the HP105B and FTS1050 that feature backup DC power inputs simplify the provision of long term backup

Re: [time-nuts] The home time-lab

Hi Brooke, Now that looks like it has promise.  I had forgotten about those.  I see a big selection on ebay.  Maybe I can find one large enough that doesn't have a large price. Bob  - AE6RV.com GFS GPSDO list:

Re: [time-nuts] The home time-lab

In message <5846a3c3-16d4-28ae-af9c-743ff895b...@triconet.org>, Wes writes: >Capacity wise this was actually overkill for my application as the >charger could supply the total load. If you go the LVDC route, your charger should be able to supply at least 150% of your full load, so that

Re: [time-nuts] The home time-lab

Hi Bob: A resonate transformer may solve your problem. I added one to my first computer, See Fig 1. http://www.prc68.com/I/comp.shtml#SWTP http://www.prc68.com/I/Images/SWTP-01b.jpg The oval shaped silver can oil capacitor is connected to a winding on the transformer and resonates at 60 Hz.

Re: [time-nuts] The home time-lab

Bob, I'm new to the time nut thing... What is the 5370? Full nomenclature so I can read up on it. I don't know how much power it draws, but I've ted to run all my HAM (including the amps), networking, home theater, lab equipment, et al. from appropriately sized batteries and charge the batts

Re: [time-nuts] The home time-lab

David wrote: This is the only deal I see at the moment but I do not know how suitable it would be and it is more than I paid although about twice as powerful: http://www.upsforless.com/apcsurta1500xlref.aspx I have a fleet of its bigger brothers, the 2000XL and 2200XL, and recommend them

Re: [time-nuts] The home time-lab

I have for years powered much of my ham station with a 90AH SLA maintained with a homemade "smart" charger. I used an analog Astron 35A power supply (RS-35M) for its raw DC and series pass transistors with its regulator board replaced with a (now obsolete) AA Engineering smart charger board.

Re: [time-nuts] The home time-lab

Some UPSes like my old Powerware 9120 monitor the AC line condition for various things and keep a log but I do not know if that would be sufficient for what you have in mind. On Fri, 8 Jul 2016 01:54:58 + (UTC), you wrote: >So, since I need to power the 5370 (preferably both) I'm looking at

Re: [time-nuts] The home time-lab

On Fri, 8 Jul 2016 11:23:39 -0400, you wrote: >David wrote: > >> This is the only deal I see at the moment but I do >> not know how suitable it would be and it is more >> than I paid although about twice as powerful: >> >> http://www.upsforless.com/apcsurta1500xlref.aspx > >I have a fleet of its

[time-nuts] The home time-lab

A simple and rather effective power line monitor: get an old cheap laptop with some sort of sound input capabilities with at least a semi-usable battery, an AC output wall wart, and a couple of divider resistors. Record the AC line as audio during your experiments. You can analyze the

Re: [time-nuts] The home time-lab

Poul, I wouldn't know the difference between a high-quality professional power line monitor and an also-ran.  Could you point me to a couple on ebay? Bob   --- GFS GPSDO list:

Re: [time-nuts] The home time-lab

Am 08.07.2016 um 08:52 schrieb Poul-Henning Kamp: A new A6 with four high quality DC/DC converters and some extra filtering would be a really big improvement both heat and efficiency wise. I keep wondering how this tiny transformer in the SR620 can power that baking tray full of ECL.

Re: [time-nuts] The home time-lab

i...@blackmountainforge.com said: > There is a company in the USA that manufactures a product called > BatteryTender - excellent float charger and maintainer. Costco sells them > for $40 How do those types of chargers work when there is a load? It's not the typical "float" there is also

Re: [time-nuts] The home time-lab

On Thu, 7 Jul 2016 21:31:58 -0400, you wrote: >If you decide to go the UPS route, don’t bother with anything that does not >produce a sine wave >output. Modern power factor corrected stuff is a lot happier with sine waves >than with weird looking >semi-square wave stuff. Active power factor

Re: [time-nuts] The home time-lab

Hi A 5335 / 5334 generation counter will spot a 30 ns blip. A modern MCU demo board probably can to the same sort of thing. The cost of another (cheap) couple of counters is probably less than mucking around with power line monitors and giant banks of batteries. The most likely output of a

Re: [time-nuts] The home time-lab

Hi Clay, Powering the GPSDOs isn't a problem.  They run on 12V and draw less than an amp.  The problem is that 5370 is a big hulking power sink and it appears that when it's hit with a spike it lets its displeasure be known in the data. Bob 

Re: [time-nuts] The home time-lab

In message <20160708041855.562d7406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu rray writes: >b...@evoria.net said: >> So, since I need to power the 5370 (preferably both) I've been staring at the 5370 PSU many times, it is a horribly inefficient design. The 5V rails are regulated down

Re: [time-nuts] The home time-lab

I have this set up in my radio room with ham radio equipment and my thunderbolt. I got the same size battery as is in my truck so if that fails, I have a drop-in replacement. There is a company in the USA that manufactures a product called BatteryTender - excellent float charger and maintainer.

Re: [time-nuts] The home time-lab

Nothing looks good at the moment.  It may be that I just have to trust the equipment testing and if there's a big blip that's not repeatable, then it didn't happen.  No, I don't like it either. Bob  --- GFS GPSDO