Re: [time-nuts] power supply design Re: Slightly OT: interest in a four-output, > ultra-low jitter, synthesizer block?

Am 26.01.2018 um 05:26 schrieb Mark Goldberg: On Thu, Jan 25, 2018 at 8:51 PM, jimlux wrote: What we've done is switcher from wide range bus (9-24V) to 8V, 60 dB ultimate attenuation low pass, switcher 8V to 5V(e.g.), 60 db low pass, linear with great HF rejection

Re: [time-nuts] Microsemi up for sale?

Hi I suspect that a lot of people are wondering who the buyer might be …. Bob > On Jan 26, 2018, at 6:27 PM, Clint Jay wrote: > > Perhaps of interest to the list > > https://www.theregister.co.uk/2018/01/25/microsemi/ > > -- > Clint. > > *No trees were harmed in the

[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

All the GPS receivers that I have tested get the time message out within a second (either before or after depending upon the model) of the 1PPS pulse... except the Jupiter receivers. For those, the last byte of the time messages arrives 1.25 seconds after the 1PPS pulse. This might cause

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Hi The target application is NTP with the PPS probably coming in via a RS-232 serial port. Anything that jitters less than 200 ns is probably going to look “same / same “. Bob > On Jan 26, 2018, at 6:48 PM, Bryan _ wrote: > > Thanks, forgot I have a Jupiter-T (D-120?) in

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Thanks, forgot I have a Jupiter-T (D-120?) in my parts box , on that note out of the two Trimble vs Jupiter-T. I think the Jupiter has a jitter of around 15ns, not sure what the Jupiter-T specs but I believe 10-20ns. -=Bryan=- From: time-nuts

[time-nuts] Microsemi up for sale?

Perhaps of interest to the list https://www.theregister.co.uk/2018/01/25/microsemi/ -- Clint. *No trees were harmed in the sending of this mail. However, a large number of electrons were greatly inconvenienced.* ___ time-nuts mailing list --

[time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

The Trimble ... it is a newer design.. The Oncore is getting rather long in the tooth and some have GPS week rollover issues. The Trimble has a higher clock rate and less 1PPS jitter. > Which would be the preference as timing receiver Motorola Oncore or a Trimble >

[time-nuts] TNS-BUF bare boards

Some time ago TAPR did a one-time run of a very low noise, very high isolation buffer amplifier. The assembled boards are sold out, but we had some extra blank boards made and finally (after a long story) got those delivered from Hungary to the office. If you're interested in a TNS-BUF

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Hi Which ever you can get for the least money. Anything much over $10 is probably “over budget”. Bob > On Jan 26, 2018, at 3:57 PM, Bryan _ wrote: > > Which would be the preference as timing receiver Motorola Oncore or a Trimble > Resolution T ? > > > -=Bryan=- > >

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

Which would be the preference as timing receiver Motorola Oncore or a Trimble Resolution T ? -=Bryan=- From: time-nuts on behalf of Pete Stephenson Sent: January 26, 2018 12:48 PM To: Paride Legovini; Discussion

Re: [time-nuts] Suggestion for a timing GPS receiver (Trimble / Ublox / other?)

On 1/22/2018 4:38 PM, Paride Legovini via time-nuts wrote: > Dear fellow nuts, > > I plan to build a decent GPS/GNSS-based Stratum 1 NTP server, and I'm > looking for a good and possibly affordable timing GPS receiver. As others have pointed out, NTP over the internet isn't usually more accurate

Re: [time-nuts] CSAC Project(was CSAC purchase)

Hi One way or the other you will need some “smarts” to do aging compensation. That implies adding a CPU of some sort to the “system” you are building. There is no built in subsystem on the CSAC that will do any of this for you. You also need some sort of display for your “wrist watch”. Having

Re: [time-nuts] CSAC Project(was CSAC purchase)

Bob: Interesting that drift rate has a stocastic component. You mentioned adding code. Was that to the software that comes with the chip? Ronald Hi The CSAC (like any vapor cell standard) has a drift (aging) process. That’s just the way it works. It is at a *much* lower rate

Re: [time-nuts] New OCXO claims ppb performance.

Hi The “ppb” number in this case is the temperature performance. Indeed, that is “pretty close” to the temperature performance of the CSAC. Aging is rated at 50 ppb / year. That’s a bit further out than what a typical CSAC will do. In either case, if you let the beast run for a year, it is

[time-nuts] New OCXO claims ppb performance.

Have just seen this and is relevant to the current CSAC discussion https://www.iqdfrequencyproducts.com/news/2018/01/18/iqd-targets-high-performance-communications-applications-with-new-tight-stability-low-phase-noise-ocxo Blair lade (Australia) --- This email has been checked for viruses by

Re: [time-nuts] power supply design Re: Slightly OT: interest in a four-output, > ultra-low jitter, synthesizer block?

On Thu, Jan 25, 2018 at 8:51 PM, jimlux wrote: > What we've done is switcher from wide range bus (9-24V) to 8V, 60 dB > ultimate attenuation low pass, switcher 8V to 5V(e.g.), 60 db low pass, > linear with great HF rejection (i.e. the LT3042) to 3V > If it is any help to

Re: [time-nuts] CSAC Project(was CSAC purchase)

Hi The CSAC (like any vapor cell standard) has a drift (aging) process. That’s just the way it works. It is at a *much* lower rate than a crystal oscillator, but it is the same sort of idea. It is one of their basic differences from a Cesium beam tube. Can you “estimate” aging in advance?

Re: [time-nuts] CSAC Project(was CSAC purchase)

Bob: Sounds reasonable. You suggest to let it age a year and reset often during the year? No way to compensate for a linear frequency drift? Ronald If you *don’t* correct the *frequency* offset, then you ultimately have a device that is off by quite a bit per

[time-nuts] BIPM looking for a physicist for their time metrology group

Details here: https://www.bipm.org/utils/en/pdf/vacancy_time_physicist2018.pdf Looks like a fun position for any time-nuts looking to do this sort of thing professionally. Cheers! -Pete -- Pete Stephenson ___ time-nuts mailing list --