I also have a stratum 1 NTP server, it is on 44.13.151.3 (ntp.g1fef.ampr.org) and it is open to 44/8
It’s a Symmetricom S200 with Rubidium clock and GPS and is located in the UK for anyone in Europe it would be better choice than the US based clocks.
For people who want an easy stratum 1 server and don't have money for such gear, have a look at the LeoNTP. It is made by a UK radio amateur and it is a GPS locked NTP server in a very small package. It costs "only" 300 pounds (about $400). We have considered it for repeaters but unfortunately it cannot provide 10 MHz and 1PPS at the same time, which we do require.
Rob
I have a few stratum 1 NTP servers as it’s an interest of mine. A couple of them are Raspberry Pi’s - for under £25 you can make yourself a stratum 1 NTP Server. The performance, whilst not as good as my S200 with rubidium clock, is still quite acceptable.
Chris
On 10 Oct 2017, at 08:16, Rob Janssen pe1chl@amsat.org wrote:
I also have a stratum 1 NTP server, it is on 44.13.151.3 (ntp.g1fef.ampr.org) and it is open to 44/8
It’s a Symmetricom S200 with Rubidium clock and GPS and is located in the UK for anyone in Europe it would be better choice than the US based clocks.
For people who want an easy stratum 1 server and don't have money for such gear, have a look at the LeoNTP. It is made by a UK radio amateur and it is a GPS locked NTP server in a very small package. It costs "only" 300 pounds (about $400). We have considered it for repeaters but unfortunately it cannot provide 10 MHz and 1PPS at the same time, which we do require.
Rob
44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
I recall a rather heated debate from a number of years ago that was about whether a GPS-locked clock was a true stratum-1 or whether it should be considered a stratum 1.5 or something like that because it didn't really have direct access to an atomic clock. Of course NTP only has integer values for the stratum so the argument was somewhat moot, but it was somewhat thought-provoking "at the time".
In the US, the surplus equipment market occasionally had GPS-trained oscillators that could provide 10Mhz and 1pps clocking as well as NMEA output. They were parts of CDMA cellphone base stations, each of which had at least two. The one I have was made by HP. I also have one that is a Motorola device that was used to synchronize simulcast transmitters in repeaters. Unfortunately, both of these devices draw more electricity than I am willing to spend on running them, here in San Diego which has the most expensive electric rates in the country. - Brian
On Tue, Oct 10, 2017 at 10:11:18AM +0100, Chris via 44Net wrote:
I have a few stratum 1 NTP servers as it’s an interest of mine.
Well, an rPi can be a Stratum1 if it uses the PPS output from the GPS clock imho. (and from what I found on the net a few years ago) If it does not use PPS output it cannot be a Stratum1 imho because the jitter will be too high
73,
Ruben - ON3RVH
-----Original Message----- From: 44Net [mailto:44net-bounces+on3rvh=on3rvh.be@mailman.ampr.org] On Behalf Of Brian Kantor Sent: dinsdag 10 oktober 2017 11:26 To: 44net@mailman.ampr.org Subject: Re: [44net] new ntp server for amprnet
I recall a rather heated debate from a number of years ago that was about whether a GPS-locked clock was a true stratum-1 or whether it should be considered a stratum 1.5 or something like that because it didn't really have direct access to an atomic clock. Of course NTP only has integer values for the stratum so the argument was somewhat moot, but it was somewhat thought-provoking "at the time".
In the US, the surplus equipment market occasionally had GPS-trained oscillators that could provide 10Mhz and 1pps clocking as well as NMEA output. They were parts of CDMA cellphone base stations, each of which had at least two. The one I have was made by HP. I also have one that is a Motorola device that was used to synchronize simulcast transmitters in repeaters. Unfortunately, both of these devices draw more electricity than I am willing to spend on running them, here in San Diego which has the most expensive electric rates in the country. - Brian
On Tue, Oct 10, 2017 at 10:11:18AM +0100, Chris via 44Net wrote:
I have a few stratum 1 NTP servers as it’s an interest of mine.
_________________________________________ 44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
I have one of these on order https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-raspberry-pi/overvi...
On Oct 10, 2017 02:33, "Ruben ON3RVH" on3rvh@on3rvh.be wrote:
Well, an rPi can be a Stratum1 if it uses the PPS output from the GPS clock imho. (and from what I found on the net a few years ago) If it does not use PPS output it cannot be a Stratum1 imho because the jitter will be too high
73,
Ruben - ON3RVH
-----Original Message----- From: 44Net [mailto:44net-bounces+on3rvh=on3rvh.be@mailman.ampr.org] On Behalf Of Brian Kantor Sent: dinsdag 10 oktober 2017 11:26 To: 44net@mailman.ampr.org Subject: Re: [44net] new ntp server for amprnet
I recall a rather heated debate from a number of years ago that was about whether a GPS-locked clock was a true stratum-1 or whether it should be considered a stratum 1.5 or something like that because it didn't really have direct access to an atomic clock. Of course NTP only has integer values for the stratum so the argument was somewhat moot, but it was somewhat thought-provoking "at the time".
In the US, the surplus equipment market occasionally had GPS-trained oscillators that could provide 10Mhz and 1pps clocking as well as NMEA output. They were parts of CDMA cellphone base stations, each of which had at least two. The one I have was made by HP. I also have one that is a Motorola device that was used to synchronize simulcast transmitters in repeaters. Unfortunately, both of these devices draw more electricity than I am willing to spend on running them, here in San Diego which has the most expensive electric rates in the country. - Brian
On Tue, Oct 10, 2017 at 10:11:18AM +0100, Chris via 44Net wrote:
I have a few stratum 1 NTP servers as it’s an interest of mine.
44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
I used a adafruit GPS module on a Olinuxino, the advantage being that it has full fledged UART ports, so no GPIO is needed for PPS.
This is the main stratum 1 source for my network. It is available as stratum 2 on yo2tm.ampr.org.
Marius, YO2LOJ
On 10.10.2017 18:00, John D. Hays wrote:
I have one of these on order https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-raspberry-pi/overvi...
On Oct 10, 2017 02:33, "Ruben ON3RVH" on3rvh@on3rvh.be wrote:
Well, an rPi can be a Stratum1 if it uses the PPS output from the GPS clock imho. (and from what I found on the net a few years ago) If it does not use PPS output it cannot be a Stratum1 imho because the jitter will be too high
The unit I referenced has PPS. I plan to have a dedicated RPi running as ntp server.
On Oct 10, 2017 08:13, "Marius Petrescu" marius@yo2loj.ro wrote:
I used a adafruit GPS module on a Olinuxino, the advantage being that it has full fledged UART ports, so no GPIO is needed for PPS.
This is the main stratum 1 source for my network. It is available as stratum 2 on yo2tm.ampr.org.
Marius, YO2LOJ
On 10.10.2017 18:00, John D. Hays wrote:
I have one of these on order https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-ras pberry-pi/overview?view=all
On Oct 10, 2017 02:33, "Ruben ON3RVH" on3rvh@on3rvh.be wrote:
Well, an rPi can be a Stratum1 if it uses the PPS output from the GPS
clock imho. (and from what I found on the net a few years ago) If it does not use PPS output it cannot be a Stratum1 imho because the jitter will be too high
44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
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