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Sets a new standards in waterflow management.

When Stalker Radar, The World Leader in Speed Measurement, began development of its new Pro II Surface Velocity Radar, it began with its newest radar platform, the Pro II. Based on the Stalker II law enforcement radar, the Pro II is backed by Stalker's nearly two decades' experience in microwave radar and its 22 accumulated patents in the industry. In addition, Stalker Radar's manufacturing process is registered to ISO9001:2000.

Pro II Ideally Suited for Water Flow Measurement
The Pro II SVR features a rugged cast-metal exterior and the world's most sensitive transmitter/receiver as well as miniaturized and modernized electronics. Its direction sensing software and updated algorithms position the Pro II as a new-generation radar ideal for the task of accurate and reliable water flow measurement. Moreover, the Pro II's Ka Band performance measuring water flow is superior to the K Band used by some of its competitors' radars.

Automatic Vertical Tilt Compensation
To make it better suited for the different elevated perspectives in comparing water flow at different times or locations, Stalker Radar engineers developed automatic vertical tilt compensation. Simply put, Stalker's SVR automatically adjusts its speed reading based on the angle the radar points at the target flow. With a vertical angle accuracy of ±2° and vertical angle resolution of 1°, if an operator takes one reading pointing down at 45°, then takes another at 50°, both flow readings will be adjusted and directly comparable.

Wide Speed Range & Settings
The Stalker Pro II SVR has a speed range of 0.2 m/s to 18.0 m/s – from below 1 mph to over 40 mph – with an accuracy of ±0.1 m/s. And it measures in meters/second, feet/second, centimeters/second, miles per hour, and kilometers per hour.

Software Upgradeable
Utilizing a state-of-the-art Digital Signal Processor (DSP), Stalker Pro II SVR provides a level of performance, convenience, and accuracy previously unavailable. The DSP performs the critical filtering and timing functions required for speed measurement in its software, as opposed to hardware. This provides less unit-to-unit variation, more reliable performance, and easier maintenance. One unique feature is that it can be upgraded in the future by simply installing new software, preventing obsolescence!

And a Lot More
Tilt compensation, settings’ range, and DSP, combined with direction sensitivity, horizontal angle adjustment, and 4 levels of sensitivity all make the Stalker Pro II SVR the new standard in water flow measurement.

Stalker's SVR automatically adjusts its speed reading based on the angle the radar points at the target flow.

    Features of the Stalker Pro II SVR (Surface Velocity Radar)

• User adjustable tilt compensation adjusts speed reading based on angle to target.

• Measures:
meters/second, feet/second, centimeters/second, miles per hour, and kilometers per hour.

• Digital Signal Processing.

• Senses flow direction - moving away, closing, or both directions.

• 4 levels of sensitivity.

Stalker Pro II SVR

General Specifications


Surface Velocity Radar Sensor

Operating Frequency

34.7 GHz (Ka-Band)


+/-100 MHz

Power Requirements

Voltage: 9-16 VDC

Current: (at 12 VDC nominal)

Transmitter on: 470 mA

Transmitter off: 100 mA


Operating: -30° to +70°C, 90% relative humidity

Non-operating: -40°C to +85°C


Weight: 2.15 lb. (0.98 kg) with battery handle attached )

Length: 7.35 in. (18.5 cm)

Width – 2.83 inches (7.2 cm)

Radar Body Material – Aluminum and Magnesium die castings

Handle Case Material – ABS polymer


+/- 0.1 M/S

Auto Self-Test

Performed every 10 minutes while transmitting

Speed Range

0.2 M/S to 180 M/S

Verticle Angle Accuracy


Verticle Angle Resolution

Microwave Specification


Conical horn



3DB Beamwidth

12° +/-

RF Source

Gunn-Effect diode

Receiver Type

Two Direct-Conversion Homodyne receivers using four low-noise Schottky battier mixer diodes

Power Output

20 mW minimum

25 mW nominal

50 mW maximum

Power Density

2 mW/cm2 maximum at 5 cm from lens

Factory Configuration


FT/S (feet.sec), CM/S (centimeters/sec), M/S (meters/sec), MPH (miles/hour), or KPH (kilometers/hour)

Leading Character Zero

Space (ASCII 20h) or “0” (ASCII 30h) for ASCII formats (A, B, S)

Serial Port Baud Rate

The serial port operates at 8 data bits, no parity and 1 stop bit (8N1) with the following selectable baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400

Serial Port Data Format

None – no data output

‘A’ – Averaged velocity output (continuous)

‘AP’ – Peak Speed only (continuous)

Communications Protocol


Auto Test Mode

Automatic test runs always or only when the radar transmitter is on.

Field Configuration


Turns the microwave transmitter On or Off

Radar Zone

Away, Closing or Auto directional sensitivity may be selected

Horizontal Angle

Angles from 0° to 60° may be selected in 5° increments


4 levels of field sensitivity may be selected (1/2/3/4 max)

Test Mode

Initiates a speed sensor self-test followed by a 60 second tuning fork mode, during which time directionality screening is disabled and the speed sensor will respond to any target direction (away or closing) or to non-directional targets (like tuning forks)