Radar detectors are designed to give the driver a proximity or distance to the radar source.  This is signal strength or the Geiger Effect.  It means the closer you get to a radar gun the higher the signal strength and more immediate the warning. All detectors have different signal strengths either by a series of lights or numbers with accompanying sound of alert.


Police use radar at a very close range, usually less than 1,000 feet.  They are taught this as they must be able to visually identify a suspect vehicle in a group.  This is called a Valid Visual Tracking History as required by the courts.  In a recent Ohio Supreme Court Case, 126 Ohio St. 3d 5, 2010-Ohio-2420, decided June 2010, Barberton v. Jenny, the court ruled the officer’s visual history is enough to issue a speeding ticket even without a radar or laser reading. However they must be experienced in visual estimation. Officers are trained to estimate the speed of a vehicle and then use a radar / laser speed reading to substantiate the infraction. Ohio’s new law is effective 1 September 2011 allows radar/laser use.


In our radar reception test, test vehicles were located at 1 ½ miles from the transmit vehicle parked and not moving. Only the tested radar detector was on.  The officers or observer reported via radio the Geiger Effect
or signal strength indicated by the detector. Each detector was given two tries per band and radar guns used included: MPH K-15 X band at 10.525 GHz, Decatur Directional Handheld K band at 24.150 GHz, and a Stalker II handheld Ka band at 34.7 GHz. If detectors did not detect radar at 1 ½ miles they then went to a 1 mile cone. All detectors correctly reported the all radar bands at 1 ½ mile. The proximity test, i.e. Geiger Effect was measured during our Nine Mile test and discussed.


The Results:  4/7 means the detector’s signal strength recorded a signal of 4 or 7. Y means detected band. 

1½ miles

X band                    K band                    Ka band                        Detector

Y 2/6, Y 2/6            Y 6/6, Y 4/6            Y 3/6, Y 3/6                TPX Detector 2.0

Y 6/6, Y 6/6            Y 5/6, Y 5/6            Y 5/6, Y 5/6                Beltronics STi Magnum

Y 3/6, Y 4/6            Y 5/6, Y 5/6            Y 6/6, Y 5/6                Beltronics STi R Plus

Y 1/5, Y 1/5            Y 2/5, Y 2/5            Y 3/5, Y 3/5                Cobra XRS 9970G

Y 6/7, Y 6/7            Y 5/7, Y 6/7            Y 6/7, Y 6/7                Escort Redline

Y 3/7, Y 4/7            Y 7/7, Y 7/7            Y 6/6, Y 6/6                Passport 9500 iX

Y 5/7, Y 5/7            Y 7/7, Y 7/7            Y 6/6, Y 6/6                Passport 8500 ci Plus

Y 4/7, Y 4/7            Y 5/7, Y 6/7            Y 6/6, Y 6/6                Escort Solo S3

Y 3/9, Y 3/9            Y 5/9, Y 5/9            Y 9/9, Y 9/9                Whistler Pro 78 SE

Y 3/9, Y 3/9            Y 5/9, Y 5/9            Y 9/9, Y 9/9                Whistler XTR 690 SE

Y 3/9, Y 3/9            Y 5/9, Y 5/9            Y 9/9, Y 9/9                Whistler Pro 78 XRi

Y 5/8, Y 6/8            Y 8/8, Y 7/8            Y 8/8, Y 8/8                Valentine One


TPX Detector is from AdaptivTechnologies









Click on button to return to home page

 


Radar Reception