[ANSS-netops] Timing: IRIG-B conversion to NMEA

[Kyle Persefield]

Mark,



It is not clear if your cable run is long or just too difficult to do?  I
know of no IRIG-B solution.  Maybe it’s your new million dollar idea?  Do
your K2’s have the external GPS port?  That’s serial data.



We use an external GPS receiver with a pair of fibermux’s.  Our solution is
pricy for the real long runs at about $3500 and the run is good out to
8km.  There might be cheaper Antenna, Receiver, F/O Mux-to-Mux deals out
there, I just have not explored any new solutions for quite some time.



For runs of about 120 feet to about 600 feet you can use an inline GPS
amplifier.  They run less than $200.  You have to do some cable loss
calculations in order to select the Db gain you’ll need (10-40Db gain).  We
use LMR400 low loss cable.



Lastly, there are also some GPS antenna, down/up converters that are good
on LMR400 to about 1500 feet.



There’s lots of choices.



Kyle sends…!!!





*From:* ANSS-netops [mailto:anss-netops-bounces at geohazards.usgs.gov] *On
Behalf Of *Meremonte, Mark
*Sent:* Wednesday, March 02, 2016 1:36 PM
*To:* anss-netops at geohazards.usgs.gov
*Subject:* [ANSS-netops] Timing: IRIG-B conversion to NMEA



Hi All,



Have a K2-Altus where difficult to install GPS coax cable to a skyview
location.   However, nearby is a network connection where IRIG-B is
available over the Ethernet.  Anyone have knowledge of an IP device that
could grab the IRIG-B signal, convert it to a standard RF GPS NMEA signal
to input over coax to K2 in this instance?



Or, I wonder if a logger that supported IP and NTP was installed, could
that IRIG-B be converted into a NTP signal for logger to utilize?



3rd option I entertained is use of an Fiber Optic Network System which has
a pair of devices which provides a standard RF GPS NMEA coax signal to
device.  (very expensive system though).



Regards,

mark



-- 

*********************************************************
Mark Meremonte         Geophysicist
U.S. Bureau of Reclamation:  Seismology, Geomorphology, and Geophysics Group

Denver Federal Center            Work: 303-445-3298  Cell: 303-808-3894

POBox 25007, 85-833000      Email: mmeremonte at usbr.gov
Denver, CO  80225                  Web: http://www.usbr.gov

Ship:  U.S. Bureau of Reclamation, DFC, Bldg. 67-10th Floor, Denver, CO
80225

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