I know that Brian at Baltic built a bunch of custom MT-based setups for one of his customers that came with a USB GPS receiver that output NEMA that the MT could read.
----- 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 3:45:42 PM Subject: Re: [AFMUG] GPS'd NTP Apparently there are USB sticks that are basically a GPS receiver and a PL2303 for $30-40. So you get the date/time. Cool. Then they take the 1PPS output to blink a f***ing LED. Really!? I was reading some blogs where folks have opened them up and wired a super tiny jumper from 1PPS to DCD. That was about 5-6 years ago using older SiRF receivers, too. Meh. A GPS+GLONASS SBJ basic and USB kit would be pretty cool. Could the USB interface also power the box, up to say 20-25 feet? The other thing is, all of the machines I'm working with have a serial port. So maybe just skip the USB altogether? I was thinking, maybe take the daisy-chain output from a SyncInjector/PowerInjector/RackInjector since those switch the pipe/box to NMEA anyway, but I don't think I'd want a path from the tower-mounted gear to server(s). And other funky stuff like noise making it into the timing for the radios would be ungood. On 9/6/2017 2:10 AM, Forrest Christian (List Account) wrote: I could tell you how to wire a syncbox junior up to a usb port if you'd like. Requires a TTL level usb to serial cable. I'd you wait a month or so until the gps+glonass version is out it well even speak nmea. Heck, now I think about this it might make a good product.... syncbox basic plus a USB dongle. On Sep 5, 2017 8:19 PM, "George Skorup" < george.sko...@cbcast.com > wrote: <blockquote> 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. </blockquote>
