Re: [time-nuts] Generating a solid PPS from 10Mhz source

Attila, On 01/20/2016 03:21 PM, Attila Kinali wrote: On Wed, 20 Jan 2016 14:13:11 + "Poul-Henning Kamp" wrote: The test results showed a quite more detailed structure with few delays over 100ps and most being between 20ps and 80ps. Interestingly, some were close to

Re: [time-nuts] HP 5372A advice

Hi Morris, On 01/20/2016 09:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, I strongly advice you to download the manuals. It is an instrument that is puzzling at times, so the manuals are needed. The upside is that they are really interesting. The operators and programming

Re: [time-nuts] HP 5372A advice

In message <569fde69.2020...@rubidium.dyndns.org>, Magnus Danielson writes: >Good, then I have not remembered completely wrong. The 5371 and 5373 manuals are not without relevance either, and don't overlook the app-notes and the HPJ (1989-02) articles either. -- Poul-Henning Kamp

Re: [time-nuts] PRS10 C900 replacement

Hi Tantalums can benefit from a 1K resistor sort of “rebuild”. On any part made in the last 30 years by a major outfit, it should not be required. Moisture is sort of a weird issue. Epoxy and humidity do strange things. Getting it back out is not easy. It also combines with the “guts” of the

Re: [time-nuts] HP 5372A advice

Has anyone published a summary of the differences between the '71 & '72? > On Jan 20, 2016, at 15:11, Poul-Henning Kamp wrote: > > > In message <569fde69.2020...@rubidium.dyndns.org>, Magnus Danielson writes: > >> Good, then I have not remembered completely

Re: [time-nuts] Generating a solid PPS from 10Mhz source

Hi > On Jan 20, 2016, at 6:28 AM, Attila Kinali wrote: > > On Mon, 18 Jan 2016 14:34:56 -0500 > Bob Camp wrote: > >> The nice thing about a FPGA (or CPLD) is that they come with a cute timing >> analyzer. You can indeed >> answer questions like this with a

Re: [time-nuts] Generating a solid PPS from 10Mhz source

Hi Poul, Your comment about on-chip PLLs got me to wondering about the dsPIC33FJ128MC804 I'm using in my GPSDO. So, I put it on the 5370A to see what's up. Input to the gate port is the drive signal for an LED that I flash at 1PPS (controlled by an on-chip timer). I delay that with a 10ft

Re: [time-nuts] Generating a solid PPS from 10Mhz source

On Wed, 20 Jan 2016 14:13:11 + "Poul-Henning Kamp" wrote: > >The test results showed a quite more > >detailed structure with few delays over 100ps and most being between > >20ps and 80ps. Interestingly, some were close to 0ps, for which > >we have no explanation good

Re: [time-nuts] Generating a solid PPS from 10Mhz source

In message <20160120122824.39fb655285dd0e68c3884...@kinali.ch>, Attila Kinali w rites: >The test results showed a quite more >detailed structure with few delays over 100ps and most being between >20ps and 80ps. Interestingly, some were close to 0ps, for which >we have no explanation good

Re: [time-nuts] PRS10 C900 replacement

On Tue, 19 Jan 2016 20:44:15 -0600 "Graham / KE9H" wrote: > You will need to know the capacitance value. Usually expressed in uF > (micro Farad). > Then some idea of the physical size, so the replacement will fit in the > current space. According to the schematics sheet

Re: [time-nuts] HP 5372A advice

On 01/20/2016 03:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, [...] I have downloaded what's there, unfortunately there's no operator's manual but I did the "Getting Started Guide" with the instrument. The prog manual might stimulate me to get GPIB up and running.

Re: [time-nuts] PRS10 C900 replacement

Do tantalum then benefit from being 'reformed' in a similar fashion to wet electrolytics? Do they recover from moisture ingress by baking in a similar fashion to SMD chips that have been stored incorrectly? On 20 Jan 2016 14:10, "Bob Camp" wrote: > Hi > > > The only thing I

Re: [time-nuts] HP 5372A advice

Morris and Gary, On 01/20/2016 03:36 PM, Gary Chatters wrote: On 01/20/2016 03:59 AM, Morris Odell wrote: Thanks very much for your reply Magnus, [...] I have downloaded what's there, unfortunately there's no operator's manual but I did the "Getting Started Guide" with the instrument. The

Re: [time-nuts] Pendulum clocks based on John Harrison's writing

Hi Ron, That's a nice article. For more information on Clock B see: http://leapsecond.com/pend/clockb/ Under "technical links" you'll see a copy of my presentation at the Harrison conference last year in Greenwich, with all the charts, graphs, and ADEV plots a time nut could wish for... /tvb

Re: [time-nuts] Thinderbolt 10 Mhz output level?

time-nuts@febo.com said: > Has anyone actually measured the 10 Mhz level on their thunderbolt? More > than +10 dbm? My scope says 5V p-p unterminated. Half that into a 50 ohm terminator. [My brain doesn't think in dB. You will have to do the conversion.] -- These are my opinions. I hate

Re: [time-nuts] Thinderbolt 10 Mhz output level?

I have now: +11.7 dBm on the 8568A spectrum analyzer with 2nd & third harmonics at -60 dBc. So yes, mine is a dB or two above +10dBm. Orin. On Tue, Jan 19, 2016 at 6:29 PM, Chris Arnold via time-nuts < time-nuts@febo.com> wrote: > Has anyone actually measured the 10 Mhz level on their

Re: [time-nuts] Thunderbolt 10 Mhz output level?

Chris wrote: Has anyone actually measured the 10 Mhz level on their thunderbolt? More than +10 dbm? Yes. In my experience, generally +12.4 to +13.3 dBm into a 50 ohm load (nominally 1vrms). Best regards, Charles ___ time-nuts mailing list --

Re: [time-nuts] PRS10 C900 replacement

david wrote: It's a 2.2uF cap, with a 0.125" lead spacing, and I'm looking for 125dC temp rating. I wondered if there were other characteristics such as ESR/ESL I need to keep in mind. You're on the right track. Get the highest temperature rating available (which is probably 125C), buy

Re: [time-nuts] Thinderbolt 10 Mhz output level?

Hi If it’s below 10 dbm, it’s broken in some way. That’s often something simple like the output coupling components or a solder joint on the coax connector. Bob > On Jan 19, 2016, at 9:29 PM, Chris Arnold via time-nuts > wrote: > > Has anyone actually measured the 10

Re: [time-nuts] PRS10 C900 replacement

Hi The only thing I would add to that is: Get it from Mouser or Digi-Key. That way you have a pretty good chance of it being one that really came from the manufacturer you think it’s coming from. You also are a lot less likely to get one that has been on the shelf forever and ever. One

Re: [time-nuts] Generating a solid PPS from 10Mhz source

On Mon, 18 Jan 2016 14:34:56 -0500 Bob Camp wrote: > The nice thing about a FPGA (or CPLD) is that they come with a cute timing > analyzer. You can indeed > answer questions like this with a quite high level of confidence. That > *assumes* that you bother to set > up the timing

Re: [time-nuts] HP 5372A advice

Thanks very much for your reply Magnus, > I strongly advice you to download the manuals. It is an instrument that > is puzzling at times, so the manuals are needed. The upside is that they > are really interesting. The operators and programming manuals get you > understand what it really does.