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2 – Set Up
16 DL™ User Manual Rev 3
SETTING UP IN THE FIELD
Figure 3 displays how you might typically use the DL in the field – for example, collecting data while receiving
differential information over a radio modem from a base station. In this situation, the GPS antenna is connected to the RF
port, the radio modem is connected to the COM1 port, and power is supplied by means of two batteries that are connected
to the Power port.
Figure 3: Typical DL Configuration – Field
For differential data collection in the field, a typical configuration is described below. This assumes that schedule and
logging parameters have already been loaded to the DL (see Chapter 3), and that a portable terminal is not being used. If
a portable terminal was being used, then at Step #7, when power was supplied, the DL would accept configuration
commands from the terminal.
1. Mount or place the DL on a secure, stable structure that will not sway or topple. For example, attach the DL to a
tripod leg using the optional mounting bracket (see Figure 14: Mounting Bracket and Figure 15, Appendix I).
Although the unit has a moisture and dust-resistant enclosure, shelter it from adverse environmental conditions when
possible.
2. Position the antenna at the desired location – e.g. on a tripod over a survey marker. The recommended antenna
depends on which model of the DL you purchased (see Choose the Right Antenna, Page 17). For maximum
positioning precision and accuracy, as well as to minimize the risk of damage, ensure that the antenna is securely
mounted on a stable structure that will not sway or topple. Where possible, select a location with a clear view of the
sky to the horizon so that each satellite above the horizon can be tracked without obstruction. The location should
also be one that minimizes the effect of multipath interference. For a discussion on multipath, please refer to the
appendix on Multipath Elimination Technology in the MiLLennium GPSCard Command Descriptions Manual.
3. Route and connect RF coaxial cable between the antenna and DL (see RF Port & Cables, Page 21).