My rough draft here is a USB-serial interface with an isolated DC-DC converter and a isolated usb-serial interface, so you are at least mostly electrically and opto isolated from the SBJ. Plug into a USB and then power the SBJT. So USB to a small box, then cat5 to the SBJ. This is a small enough and fun project that it will probably just happen and fairly quickly - I need a few of these after the nightmare of the rackinjector (think of it as a working vacation).
I've also had on the todo a NTP all in one appliance, probably in the SBJ or SB12 box. That same code would make it into the rackinjector and any followon similar products. There are quite a few things ahead of it on the roadmap though... On Wed, Sep 6, 2017 at 2:45 PM, George Skorup <[email protected]> wrote: > 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" <[email protected]> wrote: > >> 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. >> > > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
