PRAIRIE PRECISION NETWORK TECHNICAL MANUAL 2016
9
TECHNICAL REFERENCE MANUAL
INSTALLATION
Modem Antenna Location:
If you are operating in areas of questionable cellular coverage utilize the supplied
external antenna mount and/or amplifier. Mount the cellular antenna as high as possible
and as perpendicular to the surface as possible.
Most high gain antennas require a “Ground Plane” for optimal operation. Refer to your
antenna’s documentation on the size of the ground plane as it relates to the operational
frequency (bigger is always safer, i.e. a 24” ground lane will work with frequencies all
the way down to VHF.
Also, an important consideration in determined the location to mount the PPN Modem is
to avoid mounting in close proximity to any of the GPS guidance antennas / globes as
poorly filtered GPS Receivers can be affected by any cellular / Wi-Fi device.
Recommended distance from GNSS receiver is 3 feet or more for the JDM-150 modem.
Internal GPS Antenna
The main requirement of the internal GPS Antenna is that the JDM-150 modem be
mounted vertically so that the internal GPS antenna has a good view of the sky. If it
does not, it may delay the acquisition of the correct position delaying the login time to
your RTK Provider and therefore it will take longer to achieve a Fixed RTK Position. In
the situation where the internal GPS receiver cannot obtain a GGA position, the PPN
Modem will fall back to the last stored/cached position after 3 minutes.
