Re: [time-nuts] Chinese NTP Time server

2019-12-22 Thread Adrian Godwin
Sorry, that should have been '10base2 ethernet card' On Sun, Dec 22, 2019 at 11:16 PM Adrian Godwin wrote: > Voltage converter might be one of these : > > https://www.we-online.com/catalog/datasheet/177920521.pdf > > You can also sometimes find a similar device on an old 10baseT ethernet >

Re: [time-nuts] Chinese NTP Time server

2019-12-22 Thread Adrian Godwin
Voltage converter might be one of these : https://www.we-online.com/catalog/datasheet/177920521.pdf You can also sometimes find a similar device on an old 10baseT ethernet card, where it generates a -9V supply. On Sun, Dec 22, 2019 at 7:04 PM Brian Lloyd wrote: > > > On 11/26/19 09:28,

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread jimlux
On 12/22/19 3:16 PM, Taka Kamiya via time-nuts wrote: Yes. I considered float charging a battery bank and switching power supply + linear regulator combination as well. Concern with the first is safety in charging.  I was intending to use GEL cell lead acid battery.  24V chargers are

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread Taka Kamiya via time-nuts
Yes. I considered float charging a battery bank and switching power supply + linear regulator combination as well.  Concern with the first is safety in charging.  I was intending to use GEL cell lead acid battery.  24V chargers are plentiful but there is no telling what they actually do. 

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread jimlux
On 12/22/19 1:18 PM, Poul-Henning Kamp wrote: In message <1958104416.2586171.1577043445...@mail.yahoo.com>, Taka Kamiya via t ime-nuts writes: First question to the group is, how do YOU manage this problem? It used to be that there were only one kind of switching power-supply: The

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread Mark Spencer
Back when I used to accumulate time nuts gear, I also used to accumulate various linear power supplies (mostly surplus / used HP lab supplies.). Approx 10 years later I should probably should look at the noise levels, regulation etc again. I also have a 24 volt lead acid battery system for

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread Bob kb8tq
Hi Each project is a different “experience”. Some things are way more susceptible to switching noise than others. Some switchers put out way more noise than others. You would not run a linear supply on a computer. The low noise front end of a radio is going to need a quiet supply ….. There

Re: [time-nuts] Power supply for time source concerns

2019-12-22 Thread Poul-Henning Kamp
In message <1958104416.2586171.1577043445...@mail.yahoo.com>, Taka Kamiya via t ime-nuts writes: > First question to the group is, how do YOU manage this problem? It used to be that there were only one kind of switching power-supply: The noisy ones. That is no longer true by

[time-nuts] Power supply for time source concerns

2019-12-22 Thread Taka Kamiya via time-nuts
Most commercially manufactured time and frequency sources use switching power supply.  However, when contacted, tech support for SRS says, in regards to PRS-10, use linear power supply.  I am guessing, when manufacturers design complete units, they take switching noise into consideration and

Re: [time-nuts] Chinese NTP Time server

2019-12-22 Thread Brian Lloyd
On 11/26/19 09:28, x...@darksmile.net wrote: > Hello everyone, > > Does anyone here know about this item: > > https://www.ebay.com/itm/Brand-New-NTP-Time-Server-GPSDO-GPS-Disciplined-Oscillator-GPS-Clock/362758051388?hash=item547610963c:g:yFIAAOSwgztdgfM9 > > > George, N2FGX OK, I ordered one.

Re: [time-nuts] Slightly OT: MSF Clock Mechanism connections

2019-12-22 Thread David Slipper
Thanks, the photos helped when I disassembled the unit (the silk screen was smudged) and have the pin legends --- I was hoping someone would have a data-sheet or app note ... my efforts with Google have been fruitless :-( Dave On 22/12/2019 14:12, Adrian Godwin wrote: I think that might

Re: [time-nuts] Slightly OT: MSF Clock Mechanism connections

2019-12-22 Thread Adrian Godwin
I think that might be a picture from ebay. The 4th photo from this item has a better image of the text : https://www.ebay.co.uk/itm/UK-MSF-Time-Atomic-Radio-Controlled-Silent-Clock-Movement-Mechanism-DIY-Kit/153716231623?hash=item23ca338dc7:g:CAoAAOSwTeJdxS7x On Sun, Dec 22, 2019 at 1:24 PM

Re: [time-nuts] Slightly OT: MSF Clock Mechanism connections

2019-12-22 Thread Magnus Danielson
Hi, With a slight different angle you can read more of the silk screen text it seems. Can you read the full text somehow? I can make out GND, so that is a good start. Cheers, Magnus On 2019-12-22 01:14, David Slipper wrote: > ___ > time-nuts mailing

Re: [time-nuts] 11729C versions

2019-12-22 Thread Christophe Huygens
Thanks Didier, I have same manuals 2509xyz but this 11729C is 2641xyz and looks totally different. So I am looking specifically for the later one. Christophe On 21/12/19 16:24, Didier Juges wrote: > http://www.ko4bb.com/getsimple/index.php?id=manuals > > On Fri, Dec 20, 2019 at 6:00 AM

Re: [time-nuts] measuring currents on USB powered devices

2019-12-22 Thread n...@lazygranch.com
The microusb on the side I assume does the external power. On Sat, 21 Dec 2019 13:03:46 -0500 Ken Winterling wrote: > Patrick, > > I don't have this device but what I like about this one is the > ability to run from an external power supply. That means the > measuring circuit isn't consuming