Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Richard (Rick) Karlquist
This article was in the PTTI proceedings around 1990. Highly recommended. Rick Karlquist On 9/9/2011 6:58 AM, Jim Lux wrote: On 9/9/11 6:37 AM, ehydra wrote: Hi Bruce - Do you have a reference to read on for this? I imagine that's the standard cascade of limiters used in zero crossing detec

Re: [time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread Poul-Henning Kamp
In message <50393.12.6.201.2.1315603906.squir...@popaccts.quikus.com>, "J. Fors ter" writes: >On my Tek TDS the resolution of the bitmap is terrible. I'll take a 465 >and digital camera any day, and twice on Sundays. On my 540A the bitmap is exactly the same as on the screen. Make sure you have

Re: [time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread J. Forster
Hardly a surprise. Plotters use HP-GL. HP and Tektronix have been competitors for decades. HP won and Tek was sold out to corporate pirates. Tek had Plot 10, but it was incompatible with just about everything else. AFAIK, only Tek gear ran Plot 10. On my Tek TDS the resolution of the bitmap is te

Re: [time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread Marco IK1ODO
At 22:07 09/09/2011, you wrote: Has anybody had success with the Prologix GPIB adapter and Tektronix TDS320 scope? 1st goal is screen capture/plot 2nd goal would be to control the scope I have had good results using John Miles 7470.exe with a HP Spectrum analyzer, however I can't get it to wor

Re: [time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread Mark Spencer
Ditto, re controling the Tek2252. The programing was quite straight forwards. On Fri Sep 9th, 2011 4:09 PM EDT Poul-Henning Kamp wrote: >In message , Je >rome Peters writes: > >>Has anybody had success with the Prologix GPIB adapter and Tektronix TDS320 >>scope? > >I have success with the TDS54

Re: [time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread Poul-Henning Kamp
In message , Je rome Peters writes: >Has anybody had success with the Prologix GPIB adapter and Tektronix TDS320 >scope? I have success with the TDS540A, not sure if that helps you. see: https://github.com/bsdphk/pylt/blob/master/tds540a.py One of the tricks I had to do, is that the scope does

[time-nuts] Prologix GPIB adapter w/Tektronix TDS320

2011-09-09 Thread Jerome Peters
Has anybody had success with the Prologix GPIB adapter and Tektronix TDS320 scope? 1st goal is screen capture/plot 2nd goal would be to control the scope I have had good results using John Miles 7470.exe with a HP Spectrum analyzer, however I can't get it to work on the TDS320. I have also had g

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Bruce Griffiths
li...@lazygranch.com wrote: I don't have one handy, but didn't the Motorola ECL manual or maybe application guide show how to make wideband circuits (comparators for example) out of ECL gates. (1989 was the last time I did any ECL. What a pain in the arse technology.) ___

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread lists
I don't have one handy, but didn't the Motorola ECL manual or maybe application guide show how to make wideband circuits (comparators for example) out of ECL gates. (1989 was the last time I did any ECL. What a pain in the arse technology.) ___ time-

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Javier Herrero
El 09/09/2011 21:16, Bruce Griffiths escribió: Since the input signal slew rate is so high a transformer with a centre tap biased halfway between the LVDS input levels with a pair of inverse parallel clamp diodes across the secondary plus a couple of low value series resistors between the se

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Bruce Griffiths
Jim Lux wrote: On 9/9/11 6:37 AM, ehydra wrote: Hi Bruce - Do you have a reference to read on for this? I imagine that's the standard cascade of limiters used in zero crossing detectors.. google for JPL and Greenhall to get started. I can't remember the exact cite (or even if Greenhall wa

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Bruce Griffiths
Holzworth's HX2410 claims femtosecond jitter albeit with CMOS outputs. This is difficult to achieve (especially at the lower end of its input frequency range) with a comparator with 1ps of internal jitter. A simple differential pa

[time-nuts] Fwd: Re: Sine to LVDS

2011-09-09 Thread Bruce Griffiths
--- Begin Message --- Holzworth's HX2410 claims femtosecond jitter albeit with CMOS outputs. This is difficult to achieve (especially at the lower end of its input frequency range) with a comparator with 1ps of internal jitter.

Re: [time-nuts] 60hz west coast electric grid gone berserk

2011-09-09 Thread Chris Albertson
On Fri, Sep 9, 2011 at 10:17 AM, Hal Murray wrote: >> What software do you use for the monitoring? > > Things are pretty simple if you have a Linux box.  Here is the code I'm using: >  http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz.py You really don't even need software as the Linux PPS

Re: [time-nuts] 60hz west coast electric grid gone berserk

2011-09-09 Thread Doug Calvert
The OP mentioned something about pulling data from Washington (i think he was in nevada/utah). Where can you access power grid data like that over the internet? On Fri, Sep 9, 2011 at 1:17 PM, Hal Murray wrote: >> What software do you use for the monitoring? > > Things are pretty simple if you ha

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Luis Cupido
I had similar need some time ago and I found that a differential pair with two (pnp) BFR93 worked much better than any comparator(three or four tested, but not the adcmp604). (was a pll reference and I judged the impact of such observing the phase noise at microwaves). lc. ct1dmk. On 9/9/201

Re: [time-nuts] 60hz west coast electric grid gone berserk

2011-09-09 Thread Hal Murray
> What software do you use for the monitoring? Things are pretty simple if you have a Linux box. Here is the code I'm using: http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz.py Kernel support to capture PPS info into NTP was developed many years ago. The API gives you a time stamp and

Re: [time-nuts] Lucent RFTG-u-IIXO Question

2011-09-09 Thread paul swed
On rs 485 most laptops today can take the minus out as I recall to your rs 232 in. Think you have to use the rs 422 minus in with a resistor and ground the plus. Been quite a while but this works well. On Thu, Sep 8, 2011 at 12:07 AM, Bob Martinson wrote: > A Maxim MAX232 chip will do the conver

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Jim Lux
On 9/9/11 6:37 AM, ehydra wrote: Hi Bruce - Do you have a reference to read on for this? I imagine that's the standard cascade of limiters used in zero crossing detectors.. google for JPL and Greenhall to get started. I can't remember the exact cite (or even if Greenhall was one of the aut

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread ehydra
Hi Bruce - Do you have a reference to read on for this? Thanks - Henry Bruce Griffiths schrieb: Sub picosecond jitter is feasible if one cascades a series of low pass filtered limiter stages. -- ehydra.dyndns.info ___ time-nuts mailing list -- ti

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-09 Thread paul swed
The link worked fine at the nist site for me though it is slow. On Fri, Sep 9, 2011 at 4:13 AM, Pierpaolo Bernardi wrote: > On Wed, Sep 7, 2011 at 19:27, Mike Fahmie wrote: > > On a visit to NIST Boulder (then known as NBS) many years ago (1978), I > was > > presented with a copy of NBS Monograp

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Javier Herrero
Thanks for the reminder :) Te available 180MHz signal has that level, and it is quite heavily bandpass filtered, since it comes from a multiplier chain from an 45MHz OCXO, so the ADCMP604 will fit nicely Best regards, Javier El 09/09/2011 13:07, Bruce Griffiths escribió: Javier Herrero wro

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread Bruce Griffiths
Javier Herrero wrote: Hello all, I think that the same question that has been discuted here a zillion times but usually around 10MHz... anyway, what would be the best way to convert a sine wave to a LVDS clock (preferably duty cycle 50%) at 180MHz? Texas Instruments suggest a LVDS receiver

[time-nuts] Sine to LVDS

2011-09-09 Thread Javier Herrero
Hello all, I think that the same question that has been discuted here a zillion times but usually around 10MHz... anyway, what would be the best way to convert a sine wave to a LVDS clock (preferably duty cycle 50%) at 180MHz? Texas Instruments suggest a LVDS receiver as a comparator http://

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-09 Thread Pierpaolo Bernardi
On Wed, Sep 7, 2011 at 19:27, Mike Fahmie wrote: > On a visit to NIST Boulder (then known as NBS) many years ago (1978), I was > presented with a copy of NBS Monograph 155, "From Sundials to Atomic Clocks" > by one of the authors.  I found it to be a fantastic read, it answers all of > those quest

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-09 Thread Ken , VK7KRJ
Many thanks Randall, that downloaded first go. I guess nist must be blocking some ip's for whatever reason. And thanks to everyone else who replied also, your suggestions were appreciated. On 2011-09-09 08:32, Randall Prentice wrote: Have uploaded a copy in NZ. http://prento.homelinux.net/179