Re: [time-nuts] Stuff

2018-08-16 Thread John C. Westmoreland, P.E.
Bob, Sorry - this may not have come through - my e-mail: j...@westmorelandengineering.com On Thu, Aug 16, 2018 at 5:14 PM, John C. Westmoreland, P.E. < j...@westmorelandengineering.com> wrote: > Bob, > > Can you please send me your personal email address so we can have a brief > discussion

Re: [time-nuts] Stuff

2018-08-16 Thread John C. Westmoreland, P.E.
Bob, Can you please send me your personal email address so we can have a brief discussion off-list? Thanks, John Westmoreland (I'm just nuts, and not only about time! Ha!) 408-772-6237 On Thu, Aug 16, 2018 at 2:56 PM, Bob Martin wrote: > Hello, > > I am not a Time-Nut but I did work in

[time-nuts] Stuff

2018-08-16 Thread Bob Martin
Hello, I am not a Time-Nut but I did work in the field for Dr. Sam Stein of Timing Solutions from the time he founded the company in 1991. Ultimately I became one of his three partners and designed the hardware and firmware for most of his products. While I chose not to continue with the

Re: [time-nuts] High-end GPSDO's

2018-08-16 Thread Bob kb8tq
Hi Getting into the ~2 ns region is not as hard as it once was. The real gotcha is needing a L1/L2 receiver to do it *consistently*. If you just have L1, then you can easily get more than a couple of ns over a day due to various atmospheric effects. It’s not at all clear what sort of GPS

[time-nuts] High-end GPSDO's

2018-08-16 Thread Ralph Devoe
I've seen several spec sheets on high end GPSDO's that seem to have performance approaching a low-noise cesium standard, but only cost $3-6$K new. One is the SRS FS740 which appears to combine a GPSDO with the interpolator of the SR620 counter. This gets down below 10(-13) in one day and

[time-nuts] Choosing a GPS IC for carrier phase measurements

2018-08-16 Thread Nicolas Braud-Santoni
Hi, I've been working on a self-designed GPSDO (on and off for the last couple of years now), and while I got it working decently well, I've been thinking about using GPS carrier phase measurements for better accuracy. The main issue I'm running into is that most timing GPS modules will happily