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How Does a Police Radar Gun Work?

Police Radar

Police officers in North America have been using radar guns to catch speeders since 1949. This relatively simple technology evolved from military applications before World War II, where long-range installations were the size of a medium-size apartment building. Modern radar guns aren’t quite pocket-sized, but they are easily transportable and can be hand-held or installed permanently in a police vehicle. Let’s look at how a radar gun works.

How Does Speed-Detecting Radar Work?

In simple terms, a radar gun transmits a narrow beam of radio-frequency energy out the front of the gun and looks for that signal to be reflected back to the gun after bouncing off an object. Unlike lidar and laser guns, the speed measurement is calculated by how much the received signal has changed in frequency after reflecting off the moving object. This phenomenon is called a Doppler effect and is the same reason that a car sounds different as it approaches and drives away from you.

Police Radar
Radio frequency signals bouncing off a stationary object are reflected to the source at the same frequency.

Please Explain Doppler Effect to Me!

Imagine that you have a tennis ball machine shooting balls at a stationary object once every second. The balls bounce back to the machine and arrive once per second. If you start to move the object toward the ball launching machine, the balls bounce back faster and faster as the object approaches the machine. This increase in return speed represents an increase in frequency.

Police Radar
Radio frequencies that bounce off of an object moving away from the radar gun are reflected at a lower frequency.

If an object is moving away from the tennis ball machine, it will take longer for each ball to bounce back, thus representing a decrease in frequency. The digital signal processor in modern radar guns is configured to analyze the changes in the reflected signal very quickly and display a speed reading in less than a second.

Police Radar
Radio frequencies that bounce off of an object moving toward the radar gun are reflected at a higher frequency.

Different Radar Bands

Police RadarIn North America, police officers use radar guns that operate in the X, K and Ka band frequency ranges. X band is the oldest technology and operates between 8 and 12 GHz; the K band is between 18 and 27 GHz; and the Ka band is between 27 and 40 GHz. X band radar is prone to interference from automatic door opening systems. K band (K is short for Kurz, which is the German word for short) and Ka (K-above band) radar are less resistant to atmospheric absorption than X band and less effective over long distances. Most of the new radar guns such as the Stalker II and the Kustom Talon use Ka band signals, so if your detector goes off, you know you need to react right away.

Radar Detectors Provide Early Warnings

Unlike lidar, the radar signal isn’t as precise at long distances, allowing it to spread well beyond the vehicle being measured. The high-sensitivity radar receiver in a radar detector is tuned to pick up extremely low-level signals and alert you that radar is in use. You need to act quickly when a radar detector goes off. Your local specialist mobile enhancement retailer can help you choose the perfect portable or custom-installed radar for your application and ensure that the system is installed cleanly. Drop by and find out what’s available today!

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, PRODUCTS, Radar Detectors, RESOURCE LIBRARY

Product Spotlight: KICKER KEYLOC

KICKER KEYLOC

There are a dozen or so high-quality line output converters available to help your installer integrate an amplifier into a factory-installed audio system. That said, most of them are simple devices that do nothing more than adjust voltage gain and perhaps apply some equalization to the signal. KICKER’s KEYLOC is a unique solution because it features a built-in digital signal processor that undoes equalization, delays, and all-pass filters applied to the factory signal. The goal is to establish a clean signal that you can build on. Let’s check out the outstanding KICKER KEYLOC.

Basic Features of the KICKER KEYLOC

Let’s start with the basics. The KEYLOC is a two-channel line output converter that can accept up to 10 volts of signal in low-level mode and an impressive 40 volts in high-level mode. In low-level mode, the KEYLOC presents a 60-ohm load to the driving amplifier. Many factory-installed source units and amplifiers will go into protection mode without a proper load. External resistors are available from KICKER if needed for high-level operation. The maximum output of the KEYLOC is 10 volts.

The KEYLOC measures 5.5 by 2.75 inches in footprint and is 1.375 inches thick. A Molex connector on the left side includes two speaker input channels, power and ground connections, and remote turn-on and remote output wiring. The remote output activates automatically when the KEYLOC detects a DC offset voltage on the input speaker wires, enabling an aftermarket amplifier to turn on. There are a pair of RCA output jacks on the right side of the chassis to feed your new amplifier.

The top panel of the KEYLOC features two stereo potentiometers and a display with five LEDs. The pots are for adjusting input sensitivity and output voltage. The LEDs indicate power and are part of the signal testing and KEY processing features of the KEYLOC.

KICKER KEYLOC
The LED display on the front panel of the KEYLOC provides your installer with information about frequency response and correction processing.

Audio Analysis Tool

Depending on the design of your factory audio system, it might be difficult to find a full-range signal. The Low, Mid, and High LEDs on top of the KEYLOC can be used with the provided pink-noise test track to determine whether you have a full-range signal. The Low indicator illuminates when there is sufficient audio information in the 20 Hz to 200 Hz range. The Mid indicator monitors 200 Hz to 2 kHz, and the High LED monitors audio above 2 kHz. If you are missing low- or high-frequency information, the KEY processing will not produce a full-bandwidth signal for your new equipment.

The KEY to Audio Excellence

The KEYLOC uses KICKER’s patent-pending KEY algorithm to analyze a special audio test signal. The signal includes sine sweeps, pink noise, and impulses, which reveal frequency response, signal delay, and all-pass filter processing. Once measured, the KEYLOC applies its own signal processing to eliminate these attributes from the audio signal. The result is a flat frequency response signal that will allow new speakers, amplifiers, and processors to sound amazing. The process is fully automated and takes between two and 10 minutes to complete. Your installer can even temporarily bypass the correction to demonstrate how much the system has improved thanks to the KEYLOC.

KICKER KEYLOC
The KEYLOC is small enough to hide behind the radio in your dash, yet powerful enough to correct even the most complex audio signals.

Why You Need the KICKER KEYLOC

Factory-installed audio systems are typically designed to extract the best possible performance from inexpensive speakers. As such, radios and amplifiers include signal processing such as equalization, delays, and all-pass filters to create an optimized listening experience. Don’t be fooled: this processing is present even in simple “radio-only” systems and isn’t exclusive to premium systems with complex multi-channel amplifiers.

The goal of upgrading a car audio system is, of course, to make it sound better. As such, you are likely to add subwoofers and new speakers to the vehicle. The equalization that worked with the factory speakers is not likely to be ideal for the higher-performance options you’ve chosen. Eliminating factory processing with a product like the KICKER KEYLOC is crucial to achieving great sound in your car, truck, or SUV. The KEYLOC is also great for motorcycles, side-by-sides, and marine applications.

Visit a KICKER Dealer Today

When it’s time to make your vehicle’s stereo sound better, drop by an authorized KICKER retailer to find out whether the KEYLOC is needed to undo the signal processing built into your factory-installed audio system. You can find an authorized KICKER retailer near you using the Dealer Locator on the KICKER website.

Be sure to follow Kicker on Facebook, Instagram and YouTube to keep up with the latest product releases from our friends in Stillwater.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, PRODUCTS, RESOURCE LIBRARY Tagged With: KICKER

How Does a Police Laser Gun Work?

Police Laser

If you’ve ever driven past a speed trap or, worse, received a speeding ticket from a law enforcement officer using a laser gun, you may be curious about how these systems work. Also called a lidar gun, these speed measuring devices are not only very accurate, but they work quickly and reliably to let an officer know how fast you are traveling.

What Is Lidar?

Police LaserInvented in early 1960s, lidar (which is short for Light Detection And Ranging) was designed to measure distances. Lidar devices transmit a series of infrared light pulses that are focused into a beam toward an object. The system measures how long it takes for that pulse to reflect back to the laser receiver (a second lens on the front of the device). Knowing that light travels at a speed of 186,000 miles per second, the computer in the device can calculate how far away an object is, based on how long it took each the pulse of light to return.

The first practical application for lidar was when the National Center for Atmospheric Research used it to measure clouds. In 1971, the crew on the Apollo 15 mission used a laser altimeter to create a map of the moon’s surface.

How Police Laser Works

Police LaserPolice laser guns use a series of pulses to calculate speed. If the operator points the gun at a stationary object, each pulse takes the same amount of time to reflect back to the gun. The system compares these reflection times and looks for a change. When there is no change, the unit will display an object speed of 0 mph.

If the time it takes for each pulse to return is decreasing, the gun knows the object is moving toward the operator. If the reflection time is increasing, then the object is moving away from the operator. The rate of change of signal reflection time is used to determine the speed at which the object is approaching (or moving away from) the operator.

While this sounds complicated, most lidar guns can perform these calculations extremely quickly, often in 0.3 to 0.35 seconds. This incredible speed makes it impossible for a driver to slow down before the officer knows how fast he or she is driving.

Police Laser
With light traveling at 11 feet 9 1/32 inches per nanosecond, police lidar guns use changes in reflection time to calculate how fast a vehicle is traveling.
Police Laser
As the car gets closer, the time it takes for the beam of light to reflect off of the vehicle and return to the gun decreases.

Police Lidar Accuracy

Police LaserAfter inspecting the specification sheets from companies like Stalker Radar, Kustom Signals and DragonEye Technology, most laser measurement systems are rated to provide a beam width of about 2.5 to 3 feet at a distance of 1,000 feet. This accuracy allows a police officer to select a single vehicle for measurement, even in dense traffic.

In terms of speed accuracy, all of the above manufacturers claim that the speed measurement is within 1 mile per hour. Though perhaps irrelevant for a discussion of policing, most laser (and radar) guns have a maximum measuring speed of about 180 to 200 miles per hour.

Why Is It Difficult to Jam Lidar?

Police LaserLaser or lidar jammers try to detect the pulses of light from the officer’s gun and determine the pattern being used. Once they detect the pattern, they transmit a similar series of laser pulses that are intended to confuse the gun and prevent an accurate reading. Laser jammer manufacturers are always working on software updates to support the newest anti-jamming technologies.

Protect Yourself with a Laser Jammer Today

If you are interested in learning about the technologies that are available for your car or truck to prevent officers from using laser guns to measure your speed, drop by your local specialist mobile enhancement retailer today. They can explain the solutions they carry and how they can install them on your vehicle. As always, we ask that you drive safely and obey all traffic laws on your next adventure or commute.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Radar Detectors, RESOURCE LIBRARY

Can You Upgrade The Stereo in a Hybrid or Electric Vehicle?

Hybrid Stereo

Hybrid and all-electric vehicles are a great platform for stereo system upgrade. While your local specialist mobile enhancement retailer can’t tap into the main battery pack, the electrical system on these cars or trucks is more than adequate to power an amplifier to drive new speakers or a subwoofer. There are several options for upgrades and accessories that can transform your vehicle – let’s check them out.

Limitations of Factory Sound Systems

Hybrid StereoAs with most new cars and trucks, the limiting factors in the performance of the factory audio system are weight and cost. While companies like Harman, Bose, Bowers & Wilkins and Rockford Fosgate are more than capable of delivering listening experiences that can rival a live performance, they are limited by the budget for each vehicle and the amount of weight that can be added. Weight negatively affects the handling, braking, acceleration and fuel economy. That results in audio systems that sound acceptable, but not great.

Upgrading Hybrid and Electric Vehicle Stereo Systems

In almost every case, adding a subwoofer to your car or truck will make the biggest impact on the overall performance of the sound system. Right now, look at the bass setting on your car radio. Is it turned up? Even one or two notches require the factory radio and speakers to work a lot harder. Imagine if you could turn the bass down and dedicate an amplifier and speaker to reproducing low-frequency information. Your speakers will sound better and the overall system will be more lifelike, play louder and deliver better clarity.

Subwoofer systems come in all shapes and sizes, from compact solutions designed to fit into the corner of a cargo area to unique cylindrical subwoofers that fit inside a spare tire. These all-in-one bass upgrades offer great value.

Hybrid Stereo
This all-in-one subwoofer system fits inside your vehicle’s spare tire wheel and features an 11-inch subwoofer and built-in amplifier.

If a product isn’t already available for your vehicle, talk to your local specialist car stereo shop about building a custom solution. The salesperson and installation team can design a solution that uses one of the many shallow subwoofers available to create an enclosure that fits your vehicle perfectly and delivers amazing bass.

Hybrid Stereo
Custom subwoofer solutions for a Tesla Model S and a Chevy Volt deliver amazing performance without affecting the vehicle’s functionality. Images provided by Audio Designs & Custom Graphics.

DSP and Speaker Upgrades

Modern audio systems often include incredibly advanced system tuning, and many vehicles include a center channel with an upmixer to ensure that the sound delivered to every seat in your vehicle sounds great. Understanding how to work with these systems and incorporating a digital signal processor requires specific training and experience. Make sure the shop you choose to work on your vehicle understands your needs and the complexity of these factory systems before they dive in.

Hybrid Stereo
If you’re picking an amplifier, choose one with an integrated digital signal processor so your installer can fine-tune the system to deliver amazing sound.

Speakers are, without a doubt, the most important aspect of any audio system. Imagine spending thousands on a home audio CD transport, a stand-alone DAC and an amazing amplifier, only to connect a set of speakers that your uncle or cousin rescued from bulk recycling day. Upgrading the speakers in your vehicle with something truly awesome, then re-tuning the system with a signal processor to work with those new speakers, is a truly night-and-day experience.

Can I Upgrade the Radio in My Hybrid or Electric Vehicle?

In almost every case, the answer to “Can I upgrade my radio in a hybrid or electric vehicle?” is no. Does this mean you can’t upgrade the audio system? Not at all. Many companies make interfaces that are designed specifically to work with factory-installed source units to make adding amplifiers and new speakers easy and reliable.

Hybrid Stereo
Many hybrid and electric vehicles have touchscreen displays that include climate controls, navigation and vehicle information.

Choose Your Installer Wisely

Upgrading the audio system in a hybrid or electric vehicle isn’t much harder than in a conventional gasoline or diesel-powered car, truck or SUV. With that said, be sure that you choose a mobile enhancement retailer who is knowledgeable about the requirements for your specific vehicle and has the training to deliver the results you want.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, RESOURCE LIBRARY

Is it Possible to Underpower a Speaker?

Underpowered Speakers

One common misconception about speakers is that underpowering them can cause damage. This fallacy is supported by minimum power ratings from several manufacturers, which adds to the confusion. Never fear, we’re here to explain why you simply can’t damage a speaker by providing it with only a little bit of power, and we’ll clarify how this myth originated.

What Damages Speakers?

Underpowered SpeakersOther than poking a dust cap or punching a hole in the cone or surround with a screwdriver, only two things will damage a speaker: too much power and too much excursion. Too much power will cause the adhesives that bond the voice coil winding to the voice coil former to fail, subsequently allowing it to unravel and get jammed in the motor. Too much excursion can cause the spider to be damaged or the voice coil former to smash into the backplate and become deformed.

Why Do Speakers Need Power?

Underpowered SpeakersIf you want to produce sound, you need to send some amount of power to your speakers. How much power you send determines how much sound is produced. More power is fine, up to the physical or thermal limits of the speaker design.

If you feed a speaker with 1 watt of pink noise, it will play pretty loud. Depending on the size and design, a pair of conventional coaxial speakers getting 1 watt of pink noise can easily produce more than 95 dB of output in a typical vehicle. From a theoretical standpoint, an additional watt of power will increase the output to 98 dB, and doubling the power again to 4 watts produces roughly 101 dB. The process continues until the speaker cones can’t move any farther or the driver fails.

Underpowered SpeakersGoing the other way, those same speakers will provide 92 dB with 0.5 watts of power, and 89 dB with 0.25 watts. With only 0.125 watts you get 86 dB, 0.0625 watts would be 83 dB and 31.25 milliwatts produces 80 db. That’s about the same noise level as a modern sedan cruising at 65 mph. Power and output levels continue to decrease at a logarithmic rate until you simply can’t hear the music. Clearly, less power won’t cause any damage to your speakers.

Underpowered Speakers
A chart showing the increase or decrease in output of a speaker rated at 95 dB efficiency relative to the amount of power supplied from an amplifier.

What About The Myth of Not Having Enough Power?

The myth about not having enough power and damaging speakers is based around what happens when you drive an amplifier into clipping. Let’s say you have a radio with a 20-watt amplifier rated at 1% distortion. You “can” get a lot more power out of that amp, but it will include a LOT of harmonic information. If you were playing a 1 kHz tone at a total output level of 30 watts, you would hear significant 2 kHz, 4 kHz, 8 kHz and 16 kHz energy being produced. This addition of high-frequency energy can strain the thermal capabilities of the tweeters in your system.

Underpowered Speakers
A graphical representation of how an amplifier behaves when driven into distortion. You can see significant harmonic content alongside the 1 kHz fundamental frequency.

If you don’t have a powerful enough amplifier to reach the volume levels you want, you can damage the speakers by feeding them too much high-frequency energy by driving the amplifier into clipping. It’s the extra power in these harmonics that damages speakers.

Choose the Right Amp for Your Speakers

If you’re considering upgrading your car stereo system, visit your local specialist mobile enhancement retailer so you can audition different speakers for your vehicle. Choose speakers with a smooth and accurate response and an amp with excellent noise and distortion specs and that can produce as much power as the speakers are rated for. This combination, when installed and configured properly, will sound amazing and last for years.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

Filed Under: ARTICLES, Car Audio, RESOURCE LIBRARY

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