I'm pretty sure the one I looked at used the GPS receiver in the cell modem to supply the time vs. CDMA.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "George Skorup" <george.sko...@cbcast.com> To: af@afmug.com Sent: Wednesday, September 6, 2017 12:28:30 AM Subject: Re: [AFMUG] GPS'd NTP Well, yeah, you can do CDMA for clock sync, too. I've seen Arduino and Pi add-on cards that contain a GPS receiver and you basically feed the 1PPS via GPIO or something like that. I don't really want to go there. I'll keep looking around and see what I can find for standard-ish PC hardware. On 9/5/2017 9:56 PM, Mike Hammett wrote: USB cell modem? I've asked all of our GPS capable vendors to provide this on the radio. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "George Skorup" <george.sko...@cbcast.com> To: af@afmug.com Sent: Tuesday, September 5, 2017 9:19:28 PM Subject: [AFMUG] GPS'd NTP I've got a few CentOS machines running around the network doing various tasks, one being NTP for radios, routers, switches, etc. I've been having some issues with us.pool.ntp.org lately. I switched to time-(a,b,c,d).nist.gov. Apparently those are pretty busy. So is anyone else using GPS to feed NTPd? From what I've been reading, I guess I need a 1PPS capable receiver. Does that exist in a simple USB package? That would be ideal, preferably with an SMA female for an external antenna where needed. Looks like none of the cheap shit I'm finding on Amazon has PPS output.
