[time-nuts] How to achieve best results from U-Blox survey-in

I have a U-Blox LEA-M8F eval module from CSG Shop and want to run a survey-in. Are there any “best practices” for doing this, e.g. using just GPS and disabling GLONASS et al? Any tips are much appreciated. ___ time-nuts mailing list --

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

On 29 Feb 2016, at 10:46 am, Hal Murray wrote: > What distro are you starting with? > > I'm using Debian. Their kernel includes PPS support, both Wheezy and Jessie. I’m using Raspbian Jessie. PPS over GPIO is now recognised in the stock kernel but kernel PPS isn’t. I

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

On 25 Feb 2016, at 9:07 pm, Jim Harman <j99har...@gmail.com> wrote: > On Thu, Feb 25, 2016 at 1:08 PM, Neil Green <nc...@hotmail.co.uk> wrote: > >> I’ve decided to build this: >> >> http://www.hackersbench.com/Projects/1Hz/ > > Good start! > > O

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

On 24 Feb 2016, at 6:50 pm, Hal Murray wrote: > How good is your antenna? How often does your current GPS setup run out of > satellites? It’s a puck antenna placed in a window. I rent, so having an external antenna installed unfortunately isn’t an option. I’ve never

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

On 24 Feb 2016, at 4:30 pm, Chris Albertson wrote: > A simple GPSDO is, well, simple. All you do is compare the phase of > the PPS to the phase of the 10MHz crystal and then adjust the > frequency of the crystal to keep the phase difference constant. Can > be done

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

On 24 Feb 2016, at 3:08 pm, David J Taylor wrote: > A BeagleBone Black might give half the jitter compared to the RPi, but not > the order of magnitude you may be seeking. > > http://www.satsignal.eu/ntp/BBB-vs-RPi.html > > Perhaps purely for serving the pool,

[time-nuts] Next step up from basic GPS/PPS timekeeping

I currently operate a stratum 1 NTP server in the NTP pool using a U-Blox Max-7Q GPS module with PPS attached to, variously, a Raspberry Pi via GPIO or a Celeron mini PC via serial DB-9. The machine does nothing but serve time to the pool. Operating systems of choice are Debian or FreeBSD.

[time-nuts] In search of ways to improve Raspberry Pi stratum 1 server

Hi all, This is my first post to the list. I have a Raspberry Pi B+ and a HAB Supplies U-Blox Max-M8Q set in stationary mode connected to a Virgin Media Superhub (broadband router) by a 0.5m cat7 ethernet cable. The GPS is attached to the Pi's GPIO and has an external active antenna placed on