Dickey-john Radar II

Top-of-the-line ground speed sensor

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Category: Sensors & Monitoring

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Thumbnail showing Dickey-john Radar II Unit

Description

This top-of-the-line ground speed sensor delivers the truest velocity measurement available at mounting heights over 2 m.

Features

  • Installs easily.
  • Views actual ground surface for accurate speed measurement.
  • Can be mounted to look forward or backward from vehicle.
  • Velocity range 0.33-66 mph (0.53-96.6 km/h).
  • Mounts at 35±5° angle and at least 24 in. (610 mm) height from target surface (mounts anywhere from 2 to 8 ft. high).
  • Variety of factory output frequency settings available.
  • Sleek design—4 x 4 x 12.25 in. (10 x 10 x 31.1 mm).
  • Weighs only 4.5 lbs. (2.05 kg).
  • Achieves velocity errors of ±1-3% through in-field calibration.

Technical details

Velocity Range
0.53 to 96.6 km/hr (0.33 to 66 MPH)
Accuracy‡
True velocity errors of:
  • <±5%
    • 0.53 to 3.2 km/hr
    • (0.33 to 2 MPH)
  • <±3%
    • 3.2 to 107 km/hr
    • (2 to 67 MPH)
Response, Output Speed
<200 milliseconds lag for “combo” filter selection; [dv/dt =6.4 km/hr/sec (4.4 MPH/sec)]
Turn ON/OFF Delay
<305mm (12 inches) distance traversed, typical
Footprint, Target
Elliptical, 305mm (12 inches) major axis [at 601mm (24 inches) mounting height]
Mounting Angle
35 ±5° depressed from horizontal [from target surface]
Mounting Height
457 to 1219 mm (18 to 48 inches) 610mm (24 inches) nominal [from target surface]
DC Power Requirements
+Vbatt (unregulated battery voltage)
+9 to +16 VDC @ <0.6 Amp
Output Signal Characteristics
VOH = (+Vbatt – 1.5 VDC) – 1.051 (IOH);
VOL < 0.7 VDC @ IOL <6ma;
IOSS (Source) = 13 ma [+Vbatt = 16 VDC];
IOSS (Sink) = 25 ma [+Vbatt = 16 VDC];
where:
  • VOH
    • High level output signal voltage in VDC
  • VOL
    • Low level output signal voltage in VDC
  • IOH
    • High level output source current in ma
  • IOL
    • Low level output sink current in ma
  • IOSS (Source)
    • Maximum output source current for output short to ground
  • IOSS (Sink)
    • Maximum output sink current for output short to +Vbatt
Output Frequency
Factory selectable options:
  • 34.80 Hz/Km/Hr (58.94 Hz/MPH)
  • 26.11 Hz/Km/Hr (44.21 Hz/MPH)
  • 16.32 Hz/Km/Hr (27.64 Hz/MPH)
  • 10.06 Hz/Km/Hr (17.034 Hz/MPH)
Output Response Time
Factory selectable options:
  • Slow/fast combo
  • Slow
  • Fast
  • Superfast
Output Stage Characteristics
Transient/short protected NPN transistor;
ZOH = 1051 ohms;
ZOL = 63 ohms;
where:
  • ZOH
    • High level output source impedance
  • ZOL
    • Low level output sink impedance
Microwave Frequency
24.125 GHz ±50 MHz (except the United Kingdom which is 24.300 GHz)
Microwave Power Level
5mw, nominal
Overall Size
10 x 10 x 31.1 mm (4″ x 4″ x 12.25″)
Weight
2.05kg (4.5 lbs)
Agriculture Environmental Requirements
Product is immune to reverse polarity, EMI and electrical transients such as load dump, alternator field decay, inductive load switching, etc.
Operational temperature: -40°C to +85°C. Environmentally durable, i.e., not affected by chemicals, dust, salt spray, rain, wash, and mechanical shock or vibration.
Reference: Dj Product Specification and DJ Environmental Specification – Class I [Instrumentation requirements for critical control systems]
Connector
Amp 206429-1
Pin 1
Black
Ground
Pin 2
Green
Signal Out 0-12 VDC
Pin 3
Red
+12 VDC Battery
Pin 4
N/A
Radar Presence
Note: Pin 3 and Pin 4 are jumpered at the connector.
Matching Connector
Amp 206430-2
†Extended range available upon request.
‡ Basic Sensor Accuracy (Overall Instrumentation System velocity errors of ≤ ±1-3% can be achieved through in-field system calibration)