Seven radar units, six different models, from four different manufacturers were tested for problems. The study listed several recommendations based on problems encountered with some of the radars in the test. All the radar units tested operate at X band, two test models were handheld, five test models were multi-piece radars.
|CMI (handheld)||Speedgun 6||D|
|CMI (handheld)||Speedgun 8||E|
|M.P.H. Industries||K-55||B and F|
The test data does not identify the exact radar model used but instead categorizes the radar units as A, B, C, D, E, F, and G. The test revealed several operational and multiple interference problems.
|A||B||C||-||-||F||G||100%||Panning Error (All 2-piece units)|
|A||B||C||D||E||F||86%||Patrol Speed Shadowing (moving mode)|
|A||B||D||E||F||G||86%||Internal 100 watt Mobile Radio|
|A||B||C||D||F||G||86%||Internal CB Radio Transmissions|
|A||B||E||F||G||71%||Internal 2 watt Hand-held Radio|
|B||C||D||E||57%||Internal AC and Heater Fan / Motor|
|B||D||F||43%||Speed Bumping or Batching (moving mode)|
|A||B||F||43%||External Police Radios 20-30 feet distance|
|C||D||29%||Ignition and Alternator|
|F||14%||External CB Transmissions|
|F||14%||Transmit out of band (+900 kHz)|
Radars D and E (CMI Speedgun 7 and 8) were hand held, panning error does not apply.
Test radar F had the most problems (10), test radar B had the second most problems (9), both are believed to be the same model, M.P.H. Industries K-55.
Forty two percent, 5 out of 12, tuning forks tested were mislabeled or mis-calibrated. Four were low by 1 mph, one was high by 1 mph.
|Radar B traveling 40 mph||
- tracked 37 mph Pinto
- lost track several seconds
- tracked car well behind Pinto
|Radar D traveling 41 mph||
- tracked 57 mph truck well behind 35 mph Pinto
- eventually picked up Pinto
|Radar G traveling 41 mph||- tracked 57 mph truck 100 yards behind 33 mph Pinto|
|Beamwidth:||13.3° - 24.8°|
|Effective Radiated Power (ERP):||26.3 - 134 milliwatts|
|Low Voltage Condition:||6 - 11.9 Vdc|
|Maximum Detection Range:||105 feet - 1.1 miles|
MAXIMUM DETECTION RANGE TEST
86 moving mode test conducted
3 different target vehicles;
Two stationary mode test with one radar and one target vehicle, the Pinto.
- 2 door Ford Pinto,
- 2 door Ford Thunderbird,
- Augmented Winnabego Mobile Home.
|Low Voltage (volts)||11.9||6.0||7.6||10.2||10.3||6.6||11.9||10.2||9.2|
Radar A - Kustom MR-9
Radar B - MPH K-55
Radar C - Decatur MV-715
Radar D - CMI Speedgun 6
Radar E - CMI Speedgun 8
Radar F - MPH K-55
Radar G - Kustom MR-7
Based on the test results the report suggested several recommendations as summarized below.
NHTSA recommended standards based on the 1980 test may be found under the title: Performance Standards for Speed Measuring Devices, United States Department of Transportation and National Highway Traffic Safety Administration, Federal Register, Volume 46, Number 5, January 8, 1981. Below is a list of some of the recommended specifications.
10.525 ± 25 MHz
24.150 ± 100 MHz
|Minimum Detection Range||500 feet|
± 1 mph
± 2 mph
|Tuning Fork Tolerance||0.5 %|