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2 – Set Up
18 DL™ User Manual Rev 3
• Model 503 - for use with high-performance position-reference stations (features a built-in choke-ring ground plane
to minimize the effects of multipath interference)
• Model 512 - for installation on aircraft (features aerodynamic styling)
Each of these models offers exceptional phase-center stability as well as a significant measure of immunity against
multipath interference. Each one has an environmentally sealed radome.
A choke ring’s unique construction substantially reduces the multipath effect on the GPS signal. The choke ring actually
reduces the antenna gain at low elevation, where the multipath is more prone to affect system accuracy. By reducing
measurement errors due to multipath, the result is greater accuracy in your positioning calculations.
WARNING: While there may be other antennas on the market that might also serve the purpose, please note that
the performance specifications of the DL are guaranteed only when it is used with a NovAtel model 531 (L1) or model
502 (L1/L2) GPSAntenna.