10 Oct
2017
10 Oct
'17
3:16 a.m.
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
10 Oct
10 Oct
5:11 a.m.
New subject: new ntp server for amprnet
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(a)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
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5:26 a.m.
New subject: 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.
5:31 a.m.
New subject: new ntp server for amprnet
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(a)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(a)mailman.ampr.org
https://mailman.ampr.org/mailman/listinfo/44net
11 a.m.
New subject: new ntp server for amprnet
I have one of these on order
https://learn.adafruit.com/adafruit-ultimate-gps-hat-for-raspberry-pi/overv…
On Oct 10, 2017 02:33, "Ruben ON3RVH" <on3rvh(a)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(a)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(a)mailman.ampr.org
https://mailman.ampr.org/mailman/listinfo/44net
_________________________________________
44Net mailing list
44Net(a)mailman.ampr.org
https://mailman.ampr.org/mailman/listinfo/44net
11:11 a.m.
New subject: new ntp server for amprnet
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/overv…
On Oct 10, 2017 02:33, "Ruben ON3RVH" <on3rvh(a)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
>
11:32 a.m.
New subject: new ntp server for amprnet
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(a)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(a)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
>
>
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days inactive
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6 comments
6 participants
participants (6)
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Brian Kantor -
Chris -
John D. Hays -
Marius Petrescu -
Rob Janssen -
Ruben ON3RVH