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The PD420 is capable of detection to past 255 feet. The default configuration can detect a vehicle sized target out to ~300 to ~315 feet.
However, in the default configuration the lane variables can only be set to a maximum of 255 feet (start and stop range) as the lower byte of the L1 through L6 variable specified the lane start in feet and the upper byte specified the lane stop in feet. A byte can only hold a maximum value of 255.
However, starting from firmware version 152 and higher, you can change the behavior of the L1 through L6 variables that define the lane start/stop range for the 6 lanes.
If you set bit #10 (counting from 0) in the MD variable, the L1 through L6 variables operate as following:
Lower 9 bits hold the lane start in feet
Upper 7 bits hold the lane width in feet
You don’t need to do this calculation manually. Simply install the latest version of the Houston Radar Stats Analyzer/Configuration tool and if this bit is set, the GUI will allow you to set lane starts out to 512 feet.
The attached radar configuration file can be downloaded to the radar and will set MD to this correct “range extended” value.
RadarConfiguration-ExtendPD420LaneRangeSetup.rcfg
It is possible to extend the detection past the ~320 feet as well (to perhaps 400+ feet depending on target). Please contact us if you have an application for this.
There is no material trade-off just to extending the lane start to 512 feet (except lanes can now only be a maximum of 127 feet wide- probably not an issue as you can set up multiple lanes). However, if you wish to extend the detection past the ~320 feet value, you will have to sacrifice the range resolution. Please contact us via email if you wish this discuss this further.
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