Radar - Introduction

What effect occurs when, in a two piece unit, the antenna is pointed at the counting box?

When moving radar has an overload of signals, this is known as the harmonic effect.

In 1974, the first year of the nationwide 55 mph speed limit, fatal traffic crashes reduced by how much?

Auto-Lock features on radars in NC are not authorized but they are required to have an ___ ___ feature.

Strict enforcement of the speed limit:

Stats in 2009 show the % of fatal crashes that occur in a 40 mph zone or less is about 15%. 65% of all fatal 55+ zone.

This law prohibits driving faster than a specified numeric speed.

"Famous Firsts." The first traffic law in America was passed on _ by _ limiting riding horses at a gallop in the city.

Angular effect in moving radar can produce a ___ than true patrol speed causing erroneous target vehicle speeds.

General Statute for Basic Speed Law in NC is 20-141.

If there is any doubt in your mind as to which target vehicle is being tracked, you should:

K-Band radar is 24.150 Ghz, 24,150,000,000 waves per second, and has a wavelength of ___ centimeters.

About 25% of fatal crashes occur in local jurisdictions.

The radar antenna shapes, forms, ___, and receives microwave energy.

Moving radar instruments measure two speeds. They are ___ and ___.

When there is relative motion between a radar and solid object, the frequency of the reflected signal is ___.

What effect occurs when the vehicle in front of the patrol vehicle is picked up as the patrol speed?

The basic goal of all police work is :

KA-Band radar has a range of 33.4 - 36 Ghz, an average of 34,700,000,000 waves per second, and a wavelength of ___ cm.

Serious research of the use of a radio echo started in the late 1930's because of what?

When adjusting a radar units range, you are adjusting its sensitivity.

What effect occurs when the radar unit is moved while in stationary mode and a speed measurement is being made?

What year was a conv. of speeding over 7 mph through the streets viewed as a reckless disregard of the rights of others?

Four elements of a speed offense?

_____ has been the target in almost all successful challenges to RADAR.

Law states no person shall drive on a hwy at a speed greater than is reasonable and prudent under existing conditions?

Who is the Austrian physicist that discovered, in 1842, that relative motion causes a signal's frequency to change?

Excessive speed increases the severity of crashes.

What does "RADAR" stand for?

What year was the first automobile speed regulation in Hartford, CT (12 mph in the country and 8 mph in the city)?

A radar beam will travel infinitely until absorbed, reflected, or refracted.

In moving radar, the antennas should be aimed as close to ___ degrees as possible.

Research shows excessive speed is a major contributing factor to motor vehicle crashes.

The greater the angle of the stationary radar to the target vehicle, the ___ the indicated radar speed will be.

Radio energy is constant and travels at the speed of light, 30 billion centimeters per second, or___?

Raising the speed limit from 55 to 60 would increase wrecks by 1 - 2% but the number of fatalities would increase___?

The general rule in NC requires an officer to have an opinion ___ of any speed measurement equipment used.

In N.C., the angle between the radar and target vehicle can be no greater than ___ degrees?

Radar is only a tool

Interference is the natural and/or man-made energy that affects either transmitted or reflected radar beams.

RADAR operator course goal is to :

The change in radio frequency is known as the Doppler Shift.

Following the 1973 oil embargo, what year was the nationwide 55 mph maximum speed imposed to conserve fuel?

The average person has an approximate reaction time of __ of a second.

X band is 10.525 gigahertz (10,525,000,000 waves per second) and is 3 centimeters long.

Angular/Cosine effect works to the motorist advantage in stationary mode.

Speed at first sight/glance is known as Prima Facie and we do not have this law in NC.

A beam whose angle is _ degrees will be more than _ ft. wide at a point _ feet down the road and 57' wide at 300'.