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Precision Farming Bulletin
IMPORTANT
Notice for all Precision Agriculture Customers using Mid-Tech,
TeeJet, Raven or Trimble products
Many
agricultural GPS systems currently use WAAS (Wide Area
Augmentation System) which is the United States Government free
DGPS correction system. The WAAS signal is currently
transmitted by 3 geostationary satellites that broadcast
correction signals for North America: PRN-122, PRN-134 and
PRN-135. A new satellite, PRN-138, became available for use
starting July 11, 2007.
PRN-122
and PRN-134 will be decommissioned on July 31, 2007
This means that if your receiver is locked onto either of these
2 satellites, your system
will no longer function. You
will need to adjust your receiver to one of the 2 remaining
satellites PRN-135 or PRN-138. Customers using a
subscription service for GPS satellite will not be affected.
The
action required varies by manufacturer. Links are provided so
that you may take corrective action.
Newton
Crouch Inc. strongly advises all customers with WAAS GPS to be
proactive in their response to this situation. There will be a
rush to correct problems and these tech support areas will be
crowded. It is in your best interest to immediately verify
settings and test equipment prior to field use.
If you
have
Products
The
following link takes you to their Tech Support. You will be
provided with a list of affected products. TeeJet has a return
program plus a lookup on the web that will guide you through the
process of adjusting your receiver.
http://teejet.com/english/home/tech-support/technical-updates.aspx
If you
have
Products
The
following link takes you to their Tech Support. You will be
provided with a list of affected products. Raven has detailed
instructions on changing your satellite settings depending on
receiver model.
http://ravenprecision.com/us/CurrentWAAS.jsp
If you
have
Products
Trimble recommends that you upgrade firmware on your AgGPS
receiver or EZ-Guide lightbar to use the new satellites. From
here you can read the support note AgGPS Receiver Firmware
Version 3.00: Enabling New WAAS Satellites
http://trimble.com/aggps132_ts.asp?Nav=Collection-33059
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