GPS for concentrator and NTP server simultaneously. Possible?

(Bjoern A) #1


i have a little question if this is possible or not.

I thought about adding GPS with PPS to my Raspberry based Gateway. I know it is not necessary at the moment and Class B is not implemented yet.
On the other hand i thought about converting my Pi into an Stratum 1 NTP source just for the fun of it.

As far as i understand, when the packet forwarder grabs /dev/ttyAMA0 it is no longer accessible by the ntp daemon.

I will connect the GPS breakout with an USB FTDI adapter and want to use /dev/ttyUSB0 for NTP. On the other hand i also want to connect the TX line of the GPS breakout to the RX on GPIO. So the forwarder should access the signal over /dev/ttyAMA0.
The same was planned for the PPS signal. On connection to the iC880A and on to the GPIO header.

Should this work or am I missing something?

THX for the help.



There is a topic on Internet with : The Raspberry Pi as a Stratum-1 NTP Server
Folowing this link : or
You find the setup to make off your Raspberry at NTP server.
With some reading’s i think you can combine it with your own setup as Gateway.