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Chapter 1
Introduction
The DL-4 is a high performance, high accuracy, GPS receiver with fast data update rates and
integrated memory (Compact Flash Card) for data logging. The DL-4’s front panel also features a
liquid crystal display (LCD) panel and keypad for on the fly observations.
Depending on which model you purchase, the DL-4 is capable of receiving and tracking the L1 C/A
code, L1 and L2 carrier phase and L2 P-Code (or encrypted Y-Code) of up to 12 satellites. Patented
Pulsed Aperture Correlator (PAC) technology combined with a powerful microprocessor make
possible multipath-resistant processing and excellent acquisition and re-acquisition times.
Once you connect the DL-4 to an antenna and power supply, it begins operating as a fully functional
GPS system (see Chapter 2, Typical Setup on Page 19 and Chapter 3, DL-4 Setup Considerations on
Page 24, for more information on this topic). Figure 1 shows the DL-4 without an antenna or
connecting cables.
Figure 1: DL-4 Receiver
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