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

Am 22.12.2019 um 20:37 schrieb Taka Kamiya via time-nuts: > Most commercially manufactured time and frequency sources use > switching power supply. [...] The suggestion to "just use a linear power supply", especially if it was designed some decades ago is probably not getting the desired

Re: [time-nuts] Trimble Tbolt temperature

Bob wrote: Again, since it’s a Kalman, even the people who designed it were a bit unclear about just what was going on inside. Was 0.1C data useful vs 1C ?…. nobody really knew. Based on many measurements of the TC of the DAC / Ref on the TBolt, it could indeed use some “help” when in holdover.

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

Jim wrote: LT3042 removes 60-80 dB up to 10MHz. 20V, 200mA https://www.analog.com/media/en/technical-documentation/data-sheets/3042fb.pdf Achieving 60-80 dB in practice with typical DIY printed circuit layout and construction (by this I mean amateur PCB layout, typical board-house

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

On 12/23/19 5:01 AM, Achim Gratz wrote: Am 22.12.2019 um 20:37 schrieb Taka Kamiya via time-nuts: > Most commercially manufactured time and frequency sources use > switching power supply. [...] The suggestion to "just use a linear power supply", especially if it was designed some decades ago

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

Hi If you dig into the app notes on the LT304x parts after a lot of extolling the wonders and virtues, they eventually get into magnetic coupling between the “upstream” and “downstream” bypass components. Taking care of that with proper layout is possible, but non-trivial. Is milivolts of

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

I wrote: > To get even that far, one needs multiple shielding > (see list member Gerhard Hoffman's construction photos for ideas) John wrote: Being a relative newcomer here, how do I search the archives for a specific author's input? I found some random posts from Gerhard but I don't see

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

I think the conversation is going into an area way beyond my initial intent. My goal is to have a "good enough" source for 24V to run multiple time sources.  Yesterday, I measured the output of switcher I've been using for testing purpose only.  Holy cow it's dirty!  120mV peak-to-peak wide band

Re: [time-nuts] Using HP5071A with dead tube along with GPS

kb...@n1k.org said: > Like all “normal” 10811’s they are an open construction and move a bit > from > humidity and barometric pressure. How significant is humidity given that most of the interesting stuff is kept warm? Could I measure that using a typical bench as an environmental

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

On 12/23/19 5:42 AM, Bob kb8tq wrote: Hi If you dig into the app notes on the LT304x parts after a lot of extolling the wonders and virtues, they eventually get into magnetic coupling between the “upstream” and “downstream” bypass components. Taking care of that with proper layout is possible,

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

Date: Mon, 23 Dec 2019 07:51:49 -0500 From: Charles Steinmetz mailto:csteinm...@yandex.com>> To: time-nuts@lists.febo.com Subject: Re: [time-nuts] Power supply for time source concerns Message-ID:

Re: [time-nuts] Chinese NTP Time server

On Mon, Dec 23, 2019 at 9:42 AM Brian Lloyd wrote: > > > On 12/22/19 17:16, 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

On 12/22/19 17:16, 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 > card, where it generates a -9V supply. That is definitely on the right

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

On 12/23/19 10:17 AM, Taka Kamiya via time-nuts wrote: I think the conversation is going into an area way beyond my initial intent. My goal is to have a "good enough" source for 24V to run multiple time sources.  Yesterday, I measured the output of switcher I've been using for testing purpose

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

On 12/23/19 1:08 PM, Charles Steinmetz wrote: I wrote: > To get even that far, one needs multiple shielding > (see list member Gerhard Hoffman's construction photos for ideas) John wrote: Being a relative newcomer here, how do I search the archives for a specific author's input? I found