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Building a Stratum 1 NTP Server Using Raspberry Pi

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  • K
    kiokoman LAYER 8
    last edited by kiokoman Jul 2, 2019, 1:24 PM Jun 30, 2019, 6:05 PM

    i will tell you in a few days, i'm waiting for the courier ...
    raspberry pi 4, but gps is from adafruit.
    this will be my first experiment with this toys
    ...
    reviced it today, i just had the time to install raspbian and soldered the gps hat, now i need to find a way to have a gps fix. i don't have the time now to do any test, the only first impression is that the board become very hot, i will probably buy something to cool it down

    @johnpoz maybe you know, do you think it will be possible to add a display on top of the gps hat or it will not work ? RX/TX pins are for gps data and pin #4 is used for PPS on my case

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    • K
      kiokoman LAYER 8
      last edited by kiokoman Jul 3, 2019, 5:13 PM Jul 3, 2019, 5:08 PM

      and this is how it work here, i have some trouble because the "howto" available are a little outdated, i need to do some research

      pi@raspberrypi:~ $ ntpq -crv -pn
      associd=0 status=0115 leap_none, sync_pps, 1 event, clock_sync,
      version="ntpd 4.2.8p13@1.3847-o Tue Jul  2 16:07:07 UTC 2019 (2)",
      processor="armv7l", system="Linux/4.19.50-v7l+", leap=00, stratum=1,
      precision=-20, rootdelay=0.000, rootdisp=1938.001, refid=PPS,
      reftime=e0c75f48.32187a6c  Wed, Jul  3 2019 19:07:20.195,
      clock=e0c75f56.2a9026ff  Wed, Jul  3 2019 19:07:34.166, peer=43403, tc=4,
      mintc=3, offset=-0.147120, frequency=-17.048, sys_jitter=0.036991,
      clk_jitter=0.118, clk_wander=0.024
      
           remote           refid      st t when poll reach   delay   offset  jitter
      ==============================================================================
      *172.16.0.100    193.204.114.232  2 u   32   32    3    0.468    0.169   0.027
      +31.14.131.188   195.113.144.238  2 u   56   64    1   18.466    0.815   0.075
      -213.251.52.250  193.0.0.229      2 u   55   64    1   21.270    4.187  21.794
      +85.199.214.99   .GPS.            1 u   54   64    1   35.809   -0.642   0.217
      -185.19.184.35   193.204.114.233  2 u   53   64    1   22.388    4.127  23.813
      o127.127.22.0    .PPS.            0 l   14   16    7    0.000   -0.147   0.037
       127.127.20.0    .GPS.            0 l    -   64    0    0.000    0.000   0.000
      

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      • K
        kiokoman LAYER 8
        last edited by kiokoman Jul 3, 2019, 8:11 PM Jul 3, 2019, 8:11 PM

        ok this is working now, i found out that on my raspberry pi 4 the gps is not on ttyAMA0 as all the tutorial around is based on, but under ttyS0, took my awhile to find out what was wrong ...

        pi@raspberrypi:~ $ ntpq -crv -pn
        associd=0 status=0115 leap_none, sync_pps, 1 event, clock_sync,
        version="ntpd 4.2.8p12@1.3728-o (1)", processor="armv7l",
        system="Linux/4.19.50-v7l+", leap=00, stratum=1, precision=-20,
        rootdelay=0.000, rootdisp=7938.582, refid=PPS,
        reftime=e0c78921.5335fc30  Wed, Jul  3 2019 22:05:53.325,
        clock=e0c7892f.6faf75ea  Wed, Jul  3 2019 22:06:07.436, peer=4517, tc=4,
        mintc=3, offset=-0.858325, frequency=-16.929, sys_jitter=0.000954,
        clk_jitter=0.406, clk_wander=0.000, tai=37, leapsec=201701010000,
        expire=201912280000
        
             remote           refid      st t when poll reach   delay   offset  jitter
        ==============================================================================
        *172.16.0.100    134.64.19.180    2 u   23   32    1    0.474    0.189   0.167
         it.pool.ntp.org .POOL.          16 p    - 1024    0    0.000    0.000   0.001
        x127.127.20.0    .GPS.            0 l   31   64    1    0.000   -1.180   0.001
        o127.127.22.0    .PPS.            0 l   14   16    1    0.000   -0.858   0.001
        +37.247.53.178   193.204.114.232  2 u   20 1024    1   12.891   -0.781   0.375
        -213.251.52.250  193.0.0.229      2 u   14 1024    1   21.182    3.930   0.230
        +85.199.214.99   .GPS.            1 u   13 1024    1   36.061   -1.087   7.806
        -185.19.184.35   193.204.114.233  2 u   12 1024    1   22.180    3.048   0.105
        

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        • S
          stephenw10 Netgate Administrator
          last edited by Jul 4, 2019, 6:05 PM

          Looks like it's marked the GPS as a false ticker. You probably need to adjust the fudge time.

          Steve

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          • K
            kiokoman LAYER 8
            last edited by Jul 4, 2019, 6:37 PM

            yes, indeed, it's still a work in progress

            as i say a have trouble because i was unable to find any recent howto, anyway now i have this

            pi@raspberrypi:~ $ ntpq -crv -pn
            associd=0 status=0115 leap_none, sync_pps, 1 event, clock_sync,
            version="ntpd 4.2.8p12@1.3728-o (1)", processor="armv7l",
            system="Linux/4.19.50-v7l+", leap=00, stratum=1, precision=-20,
            rootdelay=0.000, rootdisp=500.060, refid=PPS,
            reftime=e0c8c525.ed3084d9  Thu, Jul  4 2019 20:34:13.926,
            clock=e0c8c52a.0f3a2862  Thu, Jul  4 2019 20:34:18.059, peer=42571, tc=4,
            mintc=3, offset=0.000149, frequency=-19.939, sys_jitter=0.000954,
            clk_jitter=0.001, clk_wander=0.000, tai=37, leapsec=201701010000,
            expire=201912280000
            
                 remote           refid      st t when poll reach   delay   offset  jitter
            ==============================================================================
            o127.127.22.0    .PPS.            0 l    5   16  377    0.000    0.000   0.001
            *127.127.28.0    .GPS.            1 l    4   16  377    0.000  -146.34  85.899
            +193.204.114.232 .CTD.            1 u   41   64  377   30.981    0.240   0.166
            +193.204.114.233 .CTD.            1 u   38   64  377   30.653    0.695   0.148
            +79.36.117.15    .GPS.            1 u   60   64  377   37.111   -1.756   0.177
            +2001:4b20::beef 85.158.25.74     2 u   65   64  377   17.923   -0.204   2.899
            +2001:67c:8:abcd .PPS.            1 u   33   64  377   31.323    0.117   6.783
            +81.94.123.17    85.158.25.74     2 u    3   64  377   21.208   -2.684   5.947
            

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            • K
              kiokoman LAYER 8
              last edited by kiokoman Jul 7, 2019, 8:39 PM Jul 6, 2019, 12:33 PM

              ok i'm putting here what i have done so far, if someone can check and give feedback pls

              inside /boot/config.txt :

              dtoverlay=pi3-disable-bt
              force_turbo=1
              init_uart_baud=9600
              dtoverlay=pps-gpio,gpiopin=4
              

              inside /boot/cmdline.txt

              dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=b55c365b-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles nohz=off
              

              inside /etc/modules

              # /etc/modules: kernel modules to load at boot time.
              #
              # This file contains the names of kernel modules that should be loaded
              # at boot time, one per line. Lines beginning with "#" are ignored.
              
              i2c-dev
              pps-gpio
              

              i have created /etc/udev/rules.d/99-gps.rules :

              KERNEL=="pps0",SYMLINK+="gpspps0"
              KERNEL=="ttyAMA0",SUBSYSTEM=="tty",MODE=="0777", SYMLINK+="gps0"
              
              sudo apt update
              sudo apt dist-upgrade
              sudo systemctl disable hciuart
              sudo systemctl disable serial-getty@ttyAMA0.service
              sudo apt-get install pps-tools ntp dnsutils setserial
              

              inside /etc/rc.local

              systemctl stop ntp #otherwise the next command will not work
              stty -F /dev/ttyAMA0 raw 9600 cs8 clocal -cstopb #set to 9600bps as per adafruit spec
              setserial /dev/ttyAMA0 low_latency # improve latency.. maybe
              #we need only GPMRC out
              /bin/echo -e '$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n' > /dev/ttyAMA0 
              systemctl start ntp
              

              inside /etc/ntp.conf

              # /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
              
              driftfile /var/lib/ntp/ntp.drift
              
              # Leap seconds definition provided by tzdata
              leapfile /usr/share/zoneinfo/leap-seconds.list
              
              # Enable this if you want statistics to be logged.
              #statsdir /var/log/ntpstats/
              
              statistics loopstats peerstats clockstats
              filegen loopstats file loopstats type day enable
              filegen peerstats file peerstats type day enable
              filegen clockstats file clockstats type day enable
              
              # By default, exchange time with everybody, but don't allow configuration.
              restrict default kod notrap nomodify nopeer noquery limited
              restrict -6 default kod notrap nomodify nopeer noquery limited
              
              # Local users may interrogate the ntp server more closely.
              restrict 127.0.0.1
              restrict -6 ::1
              
              # Needed for adding pool entries
              restrict source notrap nomodify noquery
              
              # Clients from this (example!) subnet have unlimited access, but only if
              # cryptographically authenticated.
              restrict 192.168.1.0 mask 255.255.255.0
              
              # If you want to provide time to your local subnet, change the next line.
              # (Again, the address is an example only.)
              #broadcast 192.168.123.255
              
              # If you want to listen to time broadcasts on your local subnet, de-comment the
              # next lines.  Please do this only if you trust everybody on the network!
              #disable auth
              #broadcastclient
              logfile /var/log/ntp.log
              
              server 127.127.20.0 mode 17 minpoll 4 maxpoll 4 iburts prefer
              fudge 127.127.20.0 flag1 1 time2 0.350 refid GPS
              
              pool 0.it.pool.ntp.org
              pool 1.it.pool.ntp.org
              pool 2.it.pool.ntp.org
              pool 3.it.pool.ntp.org
              

              result is:

              pi@raspberrypi:~ $ ntpq -crv -pn
              associd=0 status=0418 leap_none, sync_uhf_radio, 1 event, no_sys_peer,
              version="ntpd 4.2.8p12@1.3728-o (1)", processor="armv7l",
              system="Linux/4.19.50-v7l+", leap=00, stratum=1, precision=-19,
              rootdelay=0.000, rootdisp=1.180, refid=GPS,
              reftime=e0cb6dbc.b9fa8540  Sat, Jul  6 2019 20:58:04.726,
              clock=e0cb6dc9.863ed46d  Sat, Jul  6 2019 20:58:17.524, peer=65419, tc=4,
              mintc=3, offset=-0.000335, frequency=-18.876, sys_jitter=0.001907,
              clk_jitter=0.002, clk_wander=0.000, tai=37, leapsec=201701010000,
              expire=201912280000
              
                   remote           refid      st t when poll reach   delay   offset  jitter
              ==============================================================================
              o127.127.20.0    .GPS.            0 l   13   16  377    0.000    0.000   0.002
               0.it.pool.ntp.o .POOL.          16 p    -   64    0    0.000    0.000   0.002
               1.it.pool.ntp.o .POOL.          16 p    -   64    0    0.000    0.000   0.002
               2.it.pool.ntp.o .POOL.          16 p    -   64    0    0.000    0.000   0.002
               3.it.pool.ntp.o .POOL.          16 p    -   64    0    0.000    0.000   0.002
              -213.251.52.250  193.0.0.229      2 u   21   64  377   20.446    3.853   0.146
              -94.177.187.22   193.204.114.233  2 u   14   64  377   16.930   -0.241   0.118
              -147.135.207.213 85.199.214.99    2 u   17   64  337   28.742   -0.525   0.150
              -212.45.144.3    193.204.114.232  2 u   18   64  377   11.872    0.162   0.148
              -188.213.165.209 193.204.114.232  2 u   19   64  377   17.956    0.459   0.136
              -80.211.52.109   85.199.214.99    2 u   22   64  377   21.608   -1.141   0.134
              #5.158.71.217    94.177.187.22    3 u   17   64  377   30.960   -3.933   0.626
              +85.199.214.99   .GPS.            1 u   13   64  377   35.659   -0.337   0.172
              +37.247.53.178   193.204.114.233  2 u   16   64  377   12.341    0.191   0.159
              +185.19.184.35   193.204.114.233  2 u   21   64  377   22.090    3.996   0.139
              -80.211.178.99   194.146.251.100  2 u   10   64  377   18.669   -2.758   6.145
              
              pi@raspberrypi:~ $ sudo lsof /dev/pps0 /dev/gps0
              COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
              ntpd    11340  ntp    4u   CHR 204,64      0t0 1165 /dev/ttyAMA0
              ntpd    11340  ntp    5u   CHR  242,0      0t0 1495 /dev/pps0
              

              from what i understand there is no need for gpsd as it was causing alot of offset/jitter
              plus from what i have read around ntp now bind to /dev/pps0 and /dev/ttyAMA0 (GPS) automatically. mode 17 is 16+1 so 9600bps + GPMRC
              rif. https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html
              fudge 127.127.20.0 flag1 1 this flag tell ntp to use PPS, i can set flag1 0 and eventually add 127.127.0.22 back and adjust offset, but i don't see why if ntp do the work for me?
              my score on pool.ntp.org si now 20 and identified as stratum 1

              pi@raspberrypi:~ $ iperf -c 192.168.1.90
              ------------------------------------------------------------
              Client connecting to 192.168.1.90, TCP port 5001
              TCP window size:  232 KByte (default)
              ------------------------------------------------------------
              [  3] local 192.168.1.89 port 52616 connected with 192.168.1.90 port 5001
              [ ID] Interval       Transfer     Bandwidth
              [  3]  0.0-10.0 sec  1.08 GBytes   931 Mbits/sec
              

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              T 1 Reply Last reply Jul 4, 2020, 2:14 PM Reply Quote 0
              • T
                tman222 @kiokoman
                last edited by Jul 4, 2020, 2:14 PM

                Hi @kiokoman - thanks for posting your experience using a Raspberry Pi 4. I'm looking to give this project another go this summer and catching up again on the instructions/advice in this thread and the equipment I would need to purchase. Do you mind listing what exact equipment you ended up using and any steps you took that weren't detailed in your prior posts? At this point, I'm looking to generally follow this guide I found, however, using a Raspberry Pi 4 B instead of the Odroid C2 board.

                https://nguvu.org/pfsense/network%20time%20protocol%20(ntp)/ntp-server/

                At the time this was written the Pi 4 had not been released yet and the Odroid presented a better option over the Pi 3 given true gigabit network support. I also like the PoE hat integration which helps simplify cabling.

                Thanks in advance for any help and advice you can provide.

                1 Reply Last reply Reply Quote 0
                • K
                  kiokoman LAYER 8
                  last edited by Jul 4, 2020, 2:52 PM

                  1. Raspberry PI 4
                  2. Memory Card with raspian
                  3. GPS Adafruit ultimate GPS hat
                  4. battery cr1220
                  5. external active antenna
                  6. uFL to SMA converter

                  https://www.kiokoman.eu.org/index.php/per-non-dimenticare/24-howto-raspberry-pi-4-headless-ntp-stratum-1-gps-pps

                  https://www.ntppool.org/scores/ntp.kiokoman.eu.org

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                  • T
                    tman222
                    last edited by Nov 28, 2020, 10:09 PM

                    Thanks @kiokoman for sharing your setup and instructions, I really appreciate it. I wanted to bring this thread back up because I'm looking into this again as a small tinkering project and was also curious to learn more about the alternative APU2 based Stratum 1 NTP server setup @q54e3w mentioned above. @q54e3w - could you share some more details on your setup? Thanks in advance.

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                    • Q
                      q54e3w
                      last edited by Nov 28, 2020, 10:30 PM

                      I had a half finished build and setup guide I was in the process of putting finishing touches to but didn't get to. I'll push it to the top of the list.
                      The downside of the PTP protocol is that the accuracy isn't preserved across the LAN unless you have hardware that supports it and because of the clients who typically care about this level of accuracy, its seems to be only available in more expensive switches etc, take a look here for a starter and please follow up if you find any more home lab friendly pieces.
                      https://en.wikipedia.org/wiki/List_of_PTP_implementations
                      My hardware solution that data came from was a Intel i210 based SBC that supports IEEE1588 and a regular GPS received running stock debian with mild kernel optimization.

                      I've migrated from using NTP to Chrony which syncs up quicker especially from a cold start which was one of the drawbacks of the NTP implementation. I tried the Odroid C4 which is an updated C2 but the earlier kernels didn't have PPS deciding included and I didn't have the time to build a custom kernel. Im sure things have evolved since then.

                      All of this is perhaps irrelevant though as Ive had great success with a LeoNTP server, unbelievably accurate and consistent across the year through temperature fluctuations etc and outperforms a non temperature controlled Pi substantially.
                      http://leobodnar.com/shop/index.php?main_page=product_info&products_id=272
                      When I update that guide I'll include some performance graphs etc.

                      T 1 Reply Last reply Nov 28, 2020, 10:46 PM Reply Quote 0
                      • T
                        tman222 @q54e3w
                        last edited by Nov 28, 2020, 10:46 PM

                        @q54e3w said in Building a Stratum 1 NTP Server Using Raspberry Pi:

                        I had a half finished build and setup guide I was in the process of putting finishing touches to but didn't get to. I'll push it to the top of the list.
                        The downside of the PTP protocol is that the accuracy isn't preserved across the LAN unless you have hardware that supports it and because of the clients who typically care about this level of accuracy, its seems to be only available in more expensive switches etc, take a look here for a starter and please follow up if you find any more home lab friendly pieces.
                        https://en.wikipedia.org/wiki/List_of_PTP_implementations
                        My hardware solution that data came from was a Intel i210 based SBC that supports IEEE1588 and a regular GPS received running stock debian with mild kernel optimization.

                        I've migrated from using NTP to Chrony which syncs up quicker especially from a cold start which was one of the drawbacks of the NTP implementation. I tried the Odroid C4 which is an updated C2 but the earlier kernels didn't have PPS deciding included and I didn't have the time to build a custom kernel. Im sure things have evolved since then.

                        All of this is perhaps irrelevant though as Ive had great success with a LeoNTP server, unbelievably accurate and consistent across the year through temperature fluctuations etc and outperforms a non temperature controlled Pi substantially.
                        http://leobodnar.com/shop/index.php?main_page=product_info&products_id=272
                        When I update that guide I'll include some performance graphs etc.

                        Thanks @q54e3w, I really appreciate the response. If you don't mind me asking, where did you purchase the LeoNTP server? Is there a US distributor or did you purchase directly from the UK? Thanks again.

                        Q 1 Reply Last reply Nov 28, 2020, 10:56 PM Reply Quote 0
                        • Q
                          q54e3w @tman222
                          last edited by Nov 28, 2020, 10:56 PM

                          @tman222 https://v3.airspy.us/product/upu-leontp/

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                          • K
                            kiokoman LAYER 8
                            last edited by kiokoman Dec 1, 2020, 8:38 PM Dec 1, 2020, 8:34 PM

                            yesterday I received the waveshare max-m8q GPS hat for raspberry, I have configured it with the shared memory with gpsd, I still need to understand how to remove unnecessary GPS sentences, this is based on ublox, the adafruit was easier to configure. it seems to me that with SHM the offset is more unstable

                            UBLOX
                            status=0115 leap_none, sync_pps, 1 event, clock_sync,
                            version="ntpd ntpsec-1.1.3 2019-11-18T06:04:00Z", processor="armv7l", system="Linux/5.4.72-v7l+", leap=00, stratum=1, precision=-20, rootdelay=0.0, rootdisp=1.135, refid=PPS, reftime=e37124c1.ed9d57a5 2020-12-01T20:23:29.928Z,
                            clock=e37124cb.3ec99709 2020-12-01T20:23:39.245Z, peer=13250, tc=4, mintc=0, offset=0.000691, frequency=-18.836975, sys_jitter=0.000413, clk_jitter=0.000419, clk_wander=0.000275, tai=37, leapsec="2017-01-01T00:00Z",
                            expire="2021-06-28T00:00Z"
                                 remote                                 refid      st t when poll reach   delay   offset   jitter
                            =====================================================================================================
                            *SHM(0)                                .GPS.            0 l   10   16  377   0.0000   2.6169   1.5005
                            oPPS(0)                                .PPS.            0 l    9   16  377   0.0000   0.0007   0.0004
                            -192.168.10.200                        .GPS.            1 u   63   64  377   0.0923  -2.0291   0.0163
                            -151.3.106.211                         .GPS.            1 u   64   64  376  31.6928  -1.2702   1.2323
                            +193.204.114.232                       .CTD.            1 u   27   64  377  39.7531   0.6983   0.9118
                            +193.204.114.233                       .CTD.            1 u   20   64  375  30.1307   5.2933   0.7851
                             0.it.pool.ntp.org                     .POOL.          16 p    -  256    0   0.0000   0.0000   0.0010
                             1.it.pool.ntp.org                     .POOL.          16 p    -  256    0   0.0000   0.0000   0.0010
                            -194.0.5.123                           85.199.214.100   2 u   58   64  377  20.8733  -0.5592   1.2309
                            +37.247.53.178                         193.204.114.232  2 u    -   64  375  19.3794   0.6783   0.8454
                            
                            ADAFRUIT
                            status=0415 leap_none, sync_uhf_radio, 1 event, clock_sync,
                            version="ntpd ntpsec-1.1.3 2019-11-18T06:04:00Z", processor="armv7l", system="Linux/5.4.72-v7l+", leap=00, stratum=1, precision=-20, rootdelay=0.0, rootdisp=100.12, refid=GPS, reftime=e37127b4.87c1698d 2020-12-01T20:36:04.530Z,
                            clock=e37127bc.a80fc6d1 2020-12-01T20:36:12.656Z, peer=52517, tc=6, mintc=0, offset=-0.392457, frequency=-12.429184, sys_jitter=1.986283, clk_jitter=2.402087, clk_wander=0.192477, tai=37, leapsec="2017-01-01T00:00Z",
                            expire="2021-06-28T00:00Z"
                                 remote                                   refid      st t when poll reach   delay   offset   jitter
                            =====================================================================================================
                            oNMEA(0)                               .GPS.            0 l    8   64  373   0.0000  -0.3925   1.9863
                            +192.168.10.203                        .PPS.            1 u   30   64  377   0.1134   2.0148   0.2716
                             193.204.114.232                       .CTD.            1 u    -   64  375  31.0446   6.9845   0.8522
                             193.204.114.233                       .CTD.            1 u   30   64  377  32.4280   6.2898   0.5521
                             0.it.pool.ntp.org                     .POOL.          16 p    -  256    0   0.0000   0.0000   0.0010
                             1.it.pool.ntp.org                     .POOL.          16 p    -  256    0   0.0000   0.0000   0.0010
                            +212.45.144.88                         193.204.114.233  2 u   60   64  377  18.1799   1.5251   1.2220
                            +95.110.248.206                        193.204.114.233  2 u   14   64  377  29.5371   3.1092   0.6852
                            -162.159.200.123                       10.48.8.4        3 u   83  128  257  45.1323  -3.8529  11.8599
                            -80.211.178.99                         216.239.35.0     2 u   33  128  337  29.3981   3.7633  20.6043
                            

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                            • Q
                              q54e3w
                              last edited by q54e3w Dec 2, 2020, 4:45 AM Dec 1, 2020, 8:44 PM

                              How long has it been running? Give it 24 hours to find its groove.

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                              • K
                                kiokoman LAYER 8
                                last edited by kiokoman Dec 1, 2020, 9:15 PM Dec 1, 2020, 9:14 PM

                                yeah i'm still playing with both.. you know start / restart / reconfigure / compare :)

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                                  q54e3w
                                  last edited by Dec 1, 2020, 10:05 PM

                                  You really need to compare over a long time window, add both NTP sources to pfSense's NTP server, enable monitoring and you can observe long term trends under diagnostics.

                                  pfSense.local.lan - Status: Monitoring 2020-12-01 14-05-08.png

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                                    kiokoman LAYER 8
                                    last edited by kiokoman Dec 5, 2020, 12:44 PM Dec 5, 2020, 12:44 PM

                                    @johnpoz do you still have that uptronic running? it's basically the same one I have but from another vendor
                                    would you mind sharing your ntp.conf?
                                    i actually have this on my ntp.conf but compared to the adafruit is not that good

                                    ublox config ->

                                    server 127.127.20.0 mode 89 iburst prefer
                                    fudge 127.127.20.0 flag1 0 flag3 0 time1 0.0 time2 0.048 refid GPS
                                    
                                    server 127.127.22.0
                                    fudge 127.127.22.0 flag3 1 time2 0.0 refid PPS
                                    

                                    gps output

                                    pi@raspberrypi3:~ $ cat /dev/gps0
                                    $GNRMC,124146.00,A,4520.67417,N,01147.19928,E,0.138,,051220,,,A*6C
                                    $GNZDA,124146.00,05,12,2020,00,00*7A
                                    

                                    ublox ->

                                    *127.127.20.0    .GPS.            0 l   46   64  377    0.000    9.572   0.800
                                    o127.127.22.0    .PPS.            0 l   45   64  377    0.000    4.465   0.339
                                    

                                    adafruit part of it.pool.ntp.org ->

                                    oNMEA(0)                                 .GPS.            0 l    1   64  377   0.0000   0.0042   0.0199
                                    

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                                    johnpozJ 1 Reply Last reply Dec 5, 2020, 1:06 PM Reply Quote 0
                                    • johnpozJ
                                      johnpoz LAYER 8 Global Moderator @kiokoman
                                      last edited by johnpoz Dec 5, 2020, 2:03 PM Dec 5, 2020, 1:06 PM

                                      what are you looking for exactly? I am running ntpsec

                                      Keep in mind the sat signal just meant to get you close - the thing that keeps your time the pps

                                      The signal from gps will almost never be the selected source..

                                      And unless you don't have internet to get you close via another ntp source the gps signal doesn't mean all that much...

                                      Your looking for a ntp server that time is stable and doesn't drift, that comes from the pps signal.

                                      I don't bother playing with the fudge factors trying to get the gps to be inline with other time sources with very little offset, because in the big picture it doesn't matter.

                                      But this does remind me that should prob update my ntpsec version.. Its a bit dated.. 1.2 came out back in oct.

                                      Here is what I used to setup mine when I switched to ntpsec
                                      https://www.ntpsec.org/white-papers/stratum-1-microserver-howto/

                                      edit: Well this turned into a bit more than just clockmaker --update ;) updating my pi to buster from stretch.. Lets hope it works ;) I didn't bother to take a backup.. And just doing a dist-upgrade.. Either be real simple - or will force me to do a clean install.. Seems openssl doesn't have package for tls 1.3 support in stretch.. It's always something, and the new version of ntpsec seems to want that to compile.

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                                      • K
                                        kiokoman LAYER 8 @johnpoz
                                        last edited by kiokoman Dec 9, 2020, 3:20 PM Dec 5, 2020, 2:18 PM

                                        @johnpoz
                                        i was referring to the offset and jitter , it's much loweron the adafruit,
                                        the difference between the adafruit and the ublox is that the adafruit have the pps signal inside /dev/gps0 so i only need
                                        server 127.127.20.0
                                        and with flag1 1 I have gps+pps
                                        you see it because NMEA have the 'o' instead of only the '*'

                                        with the ublox instead i have to use /dev/gps0 and /dev/pps0 but it end up with larger offset/jitter and it drift up and down very mutch during the day compare to the adafruit, i will wait another 24h and i'll show you how the graph from the adafruit is linear but the ublox is not

                                        I'm not using gpsd / shm but direct driver, thanks for the link i will try that if i'm unable to achieve better results with my config

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                                        johnpozJ Q 2 Replies Last reply Dec 5, 2020, 2:37 PM Reply Quote 0
                                        • johnpozJ
                                          johnpoz LAYER 8 Global Moderator @kiokoman
                                          last edited by johnpoz Dec 5, 2020, 2:57 PM Dec 5, 2020, 2:37 PM

                                          Ok... So I just rebooted and updated mine to ntpsec 1.2 so current values a bit off..

                                          ntpq> version
                                          ntpsec-1.2.0+ 2020-12-05T14:15:31Z (git rev 9842b560f)
                                          

                                          But looking over the data for last 2 days so can see 5 min entries.. This looks pretty stable to me

                                          finetome.png

                                          Those are micro seconds.. Not miliseconds.. Max offset of 0.42 ms, or 0.00042 seconds..

                                          That clock jitter is pretty flat..

                                          edit: Question for you, your running min pi install right? Or did you install the gui on your pi?

                                          edit2: If your looking for some tuning advice check out
                                          https://gpsd.gitlab.io/gpsd/gpsd-time-service-howto.html#_performance_tuning

                                          An intelligent man is sometimes forced to be drunk to spend time with his fools
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                                          K 1 Reply Last reply Dec 5, 2020, 4:15 PM Reply Quote 1
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