Photo Radar Technical Information

Specifications are for the AutoPatrol PR-100, made by American Traffic Systems.

Power
Current: 5 amps
Voltage: 10 - 15V DC.

Radar unit
Transmission frequency: 34.6 gHz (+/- 10 mHz).
Transmitted power: 2.5 watts (max).
Half-power beam width: 5° horizontal, 15° vertical
Secondary lobe attenuation: Approximately 38 decibels
Measuring angle to direction of travel: 22.5°
Range: Up to 300 feet

Operating Unit
Measuring Direction: Approaching or receding traffic
Modes of operation: Every vehicle or selected individual release
Measuring range: 15 - 155 mph.
Accuracy: Up to 100 mph: +/- 1 mph, over 100 mph, +/- 1%

User Interface
Device: Notebook computer
Traffic data: All vehicles, time, speed

External Speed Display
Digit size: 9 or 12 inches
Mounting location: Variable

Central Control Unit
Measuring range: 15 - 155 mph
Measuring accuracy: Up to 100 mph: +/- 1mph; over 100 mph +/- 1%

Photo (still) Equipment
Film type: 35 mm, color or black-and-white
Lens: 150mm standard
Shutter speed: 1/1000 second, flash synchronized
Film roll length: 100 feet (650 exposures)
Film advance: Less than 0.5 seconds
Flash Duration: 1/5000 - 1/500 second
Flash Output: 50 - 400 watts
Recharge time: 1/3 second

Video Equipment
Format: NTSC
Recorder: Standard VHS
Monitor: Color
Overlay: All traffic speeds, camera viewfinder, operator, date, time, location.

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NMA Position on Speed Cameras

The NMA opposes the use of photographic devices to issue tickets. Speed cameras encourage artificially low speed limits and revenue-driven enforcement.