Re: [time-nuts] Using a common power supply among few time standards

2020-02-06 Thread jimlux
On 2/6/20 3:14 PM, Will Kimber wrote: Hi, Usual (best?) is supply slight over voltage and use LDO/RC filtering in each unit as Bob suggested. But that would require either supplying 24v/12v/5v/-12v (with some margin 10%?) or converting some single supply of 24v or 48v  in each unit to required

Re: [time-nuts] Using a common power supply among few time standards

2020-02-06 Thread Will Kimber
Hi, Usual (best?) is supply slight over voltage and use LDO/RC filtering in each unit as Bob suggested. But that would require either supplying 24v/12v/5v/-12v (with some margin 10%?) or converting some single supply of 24v or 48v  in each unit to required voltages at each piece of equipment. 

Re: [time-nuts] Using a common power supply among few time standards

2020-02-06 Thread Bob kb8tq
Hi Well, I’m sitting here plotting the stability of some eBay “frequency standards”. The one thing I *can* measure is just when the power cords get bumped. As long as you can hold sub mili-volt sorts of stability on the supplies “as delivered” it pretty much does not matter how you get

[time-nuts] Using a common power supply among few time standards

2020-02-06 Thread Taka Kamiya via time-nuts
I have been addicted to home brewing GPSDO, Rubidium, OCXO, and etc, etc, etc.  I don't mean making of these from scratch but taking a surplus unit and encase them in ready-to-use form.  Most of them are in U2 rack case. One part of it that I really do not like is constructing a power supply

[time-nuts] Experiments in NTP performance

2020-02-06 Thread Watson Ladd
Dear fellow time-nuts, I'm launching a measurement effort at Cloudflare Research to monitor and evaluate the performance of NTP and NTS servers from multiple vantage points. The goal is to create and open, distributed monitoring system, with plans to inform IETF efforts as well as the research