[time-nuts] Time Provider 1000 - what to do?
Greetings from Brazil, my first message here Just got a Time Provider 1000 from Symmetricom. Just the "unit", without power supply and/or the gps unit. My unit has the optional rubydium oscillator. What is the best option to have this osc running on my bench? Power up the entire unit (and try to figure config, etc) or extract the rubydium osc module and use it separately? Or sell everything on ebay? Thanks and 73 de PU2SEX Alexandre -- ---8<---Corte Aqui---8<--- https://www.tabalabs.com.br https://tabajara-labs.blogspot.com ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Time-nuts at WSTS conference
"scotsh whiskey" Was this intentional to indicate that more than a little bit of imbibing was involved in arriving at the new standards? Tom Holmes, N8ZM -Original Message- From: Lux, Jim Sent: Thursday, May 12, 2022 5:54 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Re: Time-nuts at WSTS conference On 5/12/22 2:48 PM, Gary Woods wrote: > On Thu, 12 May 2022 12:01:48 -0600, you wrote: > >> I've found that corridor discussions have included redefinition of >> SI-second, quantum computers, optical clocks, security on PTP clocks, >> time-scale algorithms, uncertainty of different measures. Oh, and I just >> won a bottle of scotsh whiskey. > Excellent, Magnus! I remember a tech seminar years ago, where the > instructor avowed that 80% of the education took place during the > coffee breaks! > The best international standards start as a discussion the hallway or bar, with scribbles on a paper napkin. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Time-nuts at WSTS conference
On 5/12/22 2:48 PM, Gary Woods wrote: On Thu, 12 May 2022 12:01:48 -0600, you wrote: I've found that corridor discussions have included redefinition of SI-second, quantum computers, optical clocks, security on PTP clocks, time-scale algorithms, uncertainty of different measures. Oh, and I just won a bottle of scotsh whiskey. Excellent, Magnus! I remember a tech seminar years ago, where the instructor avowed that 80% of the education took place during the coffee breaks! The best international standards start as a discussion the hallway or bar, with scribbles on a paper napkin. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Time-nuts at WSTS conference
On Thu, 12 May 2022 12:01:48 -0600, you wrote: >I've found that corridor discussions have included redefinition of >SI-second, quantum computers, optical clocks, security on PTP clocks, >time-scale algorithms, uncertainty of different measures. Oh, and I just >won a bottle of scotsh whiskey. Excellent, Magnus! I remember a tech seminar years ago, where the instructor avowed that 80% of the education took place during the coffee breaks! -- Gary Woods O- K2AHC -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Time-nuts at WSTS conference
Fellow time-nuts, This week I spend my time at the WSTS conference in Denver. While here in my commercial capacity, there is a lot of professionals lurking the list that shows up to shake the hand and say hi. Turns out that many lurk out here and read and learn lot of useful stuff. While they may work and focus on some things, you learn on a broader spectrum of issues of just lurking here. One thing I want to say to those that may not be as vocal here, asking questions here is good, as many others learn from the questions and answers. Hearing from these lurkers is also how much they appreciate reading the discussions and the answers from the big dragons and magicians sweeping in with their wisdom to share. It is good to keep this in mind as one provide answers, I try to and sometimes achieve it. I've found that corridor discussions have included redefinition of SI-second, quantum computers, optical clocks, security on PTP clocks, time-scale algorithms, uncertainty of different measures. Oh, and I just won a bottle of scotsh whiskey. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Effect of temperature on cheap puck style GNSS antennas?
Hi > On May 12, 2022, at 3:21 AM, Lux, Jim wrote: > > On 5/11/22 11:50 PM, Matthias Welwarsky wrote: >> Dear list members, >> >> My DIY GPSDO has a rather well defined dependence to the environmental >> temperature, which correlates almost linearly with a frequency shift of the >> OCXO. However, at times I see the error against the GNSS reference increasing >> with its case temperature not warranting such effect. >> >> My antenna is one of those cheap, magnetic, active antennas you'd put on a >> car >> roof. It's facing south and has full exposure to the sun, obviously. >> >> During sunrise I see the TIC error increasing 20ns-30ns over lets say 2000 >> seconds. The GPSDO case temperature rises, too, during that time as the room >> temperature increases, but it is only by 0.3°C. >> >> I'm wondering if the temperature of the antenna, which of course rises much >> faster than the room temperature, can have an effect of this magnitude? > > > Very possible. I've seen fairly large changes (nanoseconds over a 0-40C temp > range) in delay in the LNA and bandpass filter for GNSS receivers with > temperature. If they're using any sort of ceramic filter or ceramic antenna, > then that can have a fairly large tempco in the time delay. The ceramic typically used for antennas is unlikely to have that much change over any reasonable temperature range. The ceramic filters are very different beasts …. The impact of the antenna should be down in the “couple of ns” range at most. Since this is a “who knows what” antenna, there is no way to be *sure* of what it’s doing. A properly designed small / low cost antenna should do pretty well. Bob > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Effect of temperature on cheap puck style GNSS antennas?
On 5/11/22 11:50 PM, Matthias Welwarsky wrote: Dear list members, My DIY GPSDO has a rather well defined dependence to the environmental temperature, which correlates almost linearly with a frequency shift of the OCXO. However, at times I see the error against the GNSS reference increasing with its case temperature not warranting such effect. My antenna is one of those cheap, magnetic, active antennas you'd put on a car roof. It's facing south and has full exposure to the sun, obviously. During sunrise I see the TIC error increasing 20ns-30ns over lets say 2000 seconds. The GPSDO case temperature rises, too, during that time as the room temperature increases, but it is only by 0.3°C. I'm wondering if the temperature of the antenna, which of course rises much faster than the room temperature, can have an effect of this magnitude? Very possible. I've seen fairly large changes (nanoseconds over a 0-40C temp range) in delay in the LNA and bandpass filter for GNSS receivers with temperature. If they're using any sort of ceramic filter or ceramic antenna, then that can have a fairly large tempco in the time delay. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Re: Effect of temperature on cheap puck style GNSS antennas?
"During sunrise" Isn't it more likely to be due to changes in the ionosphere during sunrise/set that causes the timing discrepancies. Any changes to the antenna / LNA due to temperature will affect the reception of all satellites so should cancel out. Andy www.g4jnt.com On Thu, 12 May 2022 at 08:33, Matthias Welwarsky wrote: > Dear list members, > > My DIY GPSDO has a rather well defined dependence to the environmental > temperature, which correlates almost linearly with a frequency shift of > the > OCXO. However, at times I see the error against the GNSS reference > increasing > with its case temperature not warranting such effect. > > My antenna is one of those cheap, magnetic, active antennas you'd put on a > car > roof. It's facing south and has full exposure to the sun, obviously. > > During sunrise I see the TIC error increasing 20ns-30ns over lets say 2000 > seconds. The GPSDO case temperature rises, too, during that time as the > room > temperature increases, but it is only by 0.3°C. > > I'm wondering if the temperature of the antenna, which of course rises > much > faster than the room temperature, can have an effect of this magnitude? > > Best regards, > Matthias > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
[time-nuts] Effect of temperature on cheap puck style GNSS antennas?
Dear list members, My DIY GPSDO has a rather well defined dependence to the environmental temperature, which correlates almost linearly with a frequency shift of the OCXO. However, at times I see the error against the GNSS reference increasing with its case temperature not warranting such effect. My antenna is one of those cheap, magnetic, active antennas you'd put on a car roof. It's facing south and has full exposure to the sun, obviously. During sunrise I see the TIC error increasing 20ns-30ns over lets say 2000 seconds. The GPSDO case temperature rises, too, during that time as the room temperature increases, but it is only by 0.3°C. I'm wondering if the temperature of the antenna, which of course rises much faster than the room temperature, can have an effect of this magnitude? Best regards, Matthias ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
