Re: [time-nuts] Three-cornered hat on timelab?

On Thu, Apr 27, 2017 at 12:48 PM, Bob Stewart wrote: > So, back to my question: Where are the large ionospheric phase moves? > This question has been causing me doubt since I started on this project. > Or don't I still have enough data collected for this to happen? > > Bob >

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, This is a phase plot of a rubidium to an M12 from a test that I did back in 2008. The offset and ageing have been removed, but there is still a bit of wander. As with your plot, constellation related issues appear the most obvious. Peak to peak is fairly similar too. Angus. On Thu,

Re: [time-nuts] Three-cornered hat on timelab?

Hi Jim, I'm not sure you're plotting what you think you are, but perhaps I misunderstood.  The phase error data contains both the position uncertainty of the Adafruit (constellation, ionosphere, etc) and an error caused by correcting the OCXO using that phase error.  IOW, the fact that the

Re: [time-nuts] TAPR Oncore M12+ kit

On this product people are going to want holes drilled and I think a "D" shape hole for the DB type connector. The holes would allow easy clamping but in a two step operation.If I were making these I'd first clamp the stock over a pair of 123 blocks, mill the holes, then after I hade a batch

Re: [time-nuts] Three-cornered hat on timelab?

Hi Magnus, OK, a couple of things about my location.  I'm in West Houston, and it's not summer yet, so there's a lot of variation in temperature from day to day.  Some nights it's in the 40sF and some nights it's in the high 70s or low 80sF.  Lots of variation in the days, as well.  My antenna

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, For that receiver, you have a pretty good result. If you haven't moved your antenna, the average result should be fine. However, with a cesium around you can experiment with minor adjustments of position. Best would be to build carrier phase pseudo-range measurements and compare with

[time-nuts] TAPR Oncore M12+ kit

I'd say screw the gasket / inset crud and go with flat stock or pcb material (my Star-4 GPSDO came in a very similar housing and uses PCB endplates. It's much easier and cheaper. I doubt that very many people will be installing these outdoors, etc and need the fancy pants end plates and

[time-nuts] TAPR Oncore M12+ kit

OSHPARK has made several boards for me with cutouts. You put the cutout on the milling layer and they recommend putting the word "CUTOUT" within the cutout area. It's been a few years since I had any made that way... best to ask them. Also inquire about the milling bit radius... you can't

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, On 04/27/2017 06:48 PM, Bob Stewart wrote: Hi Magnus, Try as I might, the weather and the local power company had other ideas about my long term capture. I'm running everything but the 5370 from a UPS. I guess I'm going to have to get batteries for my other UPS and run the 5370 from