Radar electrical circuits working principle. Putting together a personal short-range radar

"Antiradar" in analysis. ( Radar detector - a passive receiver of police radar signals, warning the driver about the need to comply with the established speed limit.)

Today we will focus on electronic warfare devices on our roads.
While antiradars and radar detectors are not prohibited in our country, we do not have electronic warfare, but in some countries the war is in full swing. We can only prepare.

Electronic warfare (EW) is a type of armed struggle, during which radio emissions (radio interference) are applied to the radio-electronic means of enemy control, communications and reconnaissance systems in order to change the quality of military information circulating in them, to protect their systems from similar influences, as well as to change conditions (properties environment) propagation of radio waves. Wikipedia

How to resist someone who is trying to remove information about you without your knowledge and how to protect your "personal data" from unauthorized removal.

Radars, radar detectors, radar detector detectors. About what there are, how to make / saw yourself both.
(Thanks to the online store fonarimarket.ru for the equipment provided)

Radars

The world's first radar

World's first car radar

Some of the first police radars of the mid-20th century:

blogs.sydneylivingmuseums.com.au/justice/index.php/2011/04/05/a-deterrent-for-scorchers

RF radar (Doppler radar) emits a high frequency X-, K- or Ka-band radio signal towards the vehicle. The frequency of the reflected signal changes in proportion to the speed of the object. After receiving the reflected signal, the radar measures the frequency deviation and calculates the vehicle speed. The obtained speed value is displayed on the radar display or transmitted to the situation center, if the radar is stationary.

Traffic police radar ranges are determined by international agreements. In Russia, three ranges are certified, the frequencies of all radars used by the traffic police in our country must be within their limits.

X-band (operating frequency 10.525 GHz). The first detectors worked in this range, but today they have almost completely given way to equipment using other frequencies, although some foreign and Russian (BARER, SOKOL) continue to use it.

K-band (carrier frequency 24.150 GHz). Basic for the vast majority of traffic police radars in the world. The devices operating in it are more compact, but have a greater detection range than X-band devices.

L-band (1-2GHz).

Range VG-2 (16000 MHz) is the band that the police of some European countries (where radar detectors are prohibited) use to detect vehicles with radar detectors.

The promising K a and K u ranges have not yet been certified in Russia, and we do not use radar cameras in these ranges. The detectors used by motorists are tuned to the traffic police radar ranges of all frequencies used in our country.

The second type of police radar is laser radar(lidar) or, as it is often called, optical. Lidar emits short laser pulses outside the visual range (IR), at a fixed time interval, towards the vehicle. These pulses are reflected from the vehicle and received by a laser meter. Lidar records the change in the distance to the object by the delay time of each reflected pulse. A digital lidar device calculates the speed of a vehicle using data on the change in range over a fixed period of time.

Big Brother's guns

Radar "Iskra-1"

The Iskra-1 radar is a reliable and efficient speed meter operating in the K-band. For 15 years, the radar has been successfully used by road checkers to control the speed limit on the roads of Russia. Iskra-1 operates at the doubled K-band frequency, which significantly increases the reliability of measurements in adverse weather conditions. A distinctive feature of the Iskra-1 models is the monopulse speed measurement method. This mode ensures high performance of the device: the radar calculates the parameters of the car movement in just 0.2 seconds. At the same time, the radar is practically invisible to all foreign-made radar detectors not adapted to Russian conditions: all of them perceive the Iskra's short-pulse signal as interference.

Specifications
Device type radar


, patrolman (on the move)

Speed \u200b\u200bmeasurement range 30-220 km / h

The lineup
Iskra-1V is designed to operate in a stationary mode, mainly in one direction. The radar makes it possible to identify in the traffic flow the vehicle with the highest speed in almost any conditions, exceeding the speed of the traffic by only 5 km / h.

Iskra-1D is the first Russian radar capable of operating in all directions in a moving patrol car. In one second, the radar manages to make a fivefold measurement of the target's own speed and speed, eliminate possible errors, process the measurement results and display them on a display that sequentially displays the target's speed, its own speed and time since the beginning of the measurement.

Radar "Sokol-M"
The Sokol-M mobile radar is an autonomous radar speed meter operating in the outdated X-band. The device is designed to determine the speed of oncoming vehicles only. Dimensional, easy-to-use, the radar is able to control the speed of both individual cars and those moving in the stream at a distance of 300-500 m. It is perfectly recognized by "white" radar detectors of any price category. The Sokol-M radar was discontinued in 2008, but due to its high reliability, ease of use and relatively low price, it is now very widely used in Russia and the countries of the commonwealth.

Specifications
Device type radar
Operating frequency of the speed meter 10500-10550 MHz (X-band)
Controlled driving directions all directions
(in move)

The lineup
Sokol-M-S is designed for stationary speed control and has an adjustable range. All Sokol-M models operate in the Ultra-X pulse mode, which makes these radars elusive for lower-price radar detectors and models that are not adapted for use in Russian conditions.

"Sokol-M-D" is designed to measure the speed of oncoming and passing vehicle in a moving patrol car.

"Sokol-Visa" - a mobile complex for measuring speed and video recording is a radar "Sokol-M", working in tandem with a digital video camera. The system operates in a stationary mode (it is installed mainly on a stationary patrol car) and can measure the speed of only oncoming cars. The Sokol-Visa complex records on video not only violations of the speed limit, but also traffic at red lights and the intersection of continuous lanes - it is almost impossible to protest such accusations of traffic violations.

Radar "Binar"
A special feature of "Binar" is the presence of two video cameras: the first serves for a wide view of the traffic situation, the second takes close-up shots of the intruder's car with a distinguishable license plate at a distance of up to 200 meters. The device is capable of operating stationary or while the traffic police patrol car is moving. The presence of two video recordings in addition to the radar readings simplifies the monitoring of the situation on the road and increases the reliability of identifying the offender. Binar is equipped with a non-volatile memory card in SD format, is lightweight, can be charged from the vehicle's on-board network and can be synchronized with a computer. The radar is controlled by a remote control or a touch screen.

Specifications

The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled driving directions all directions
Speed \u200b\u200bmeasurement mode stationary, patrol
Detection range up to 300 m

Measurement error ± 2 km / h

Radar "Radis"
Radar "Radis" has high accuracy and fast measurement speed with the ability to choose the nearest or the fastest vehicle from the traffic stream. The device is capable of measuring the speed in both the opposite and passing directions, is equipped with two displays with bright backlighting and has a simple control using the on-screen menu. The radar is capable of measuring speed while charging from the vehicle's on-board network. The weight of the device is only 450 g. "Radis" can be installed in the cabin, as well as on the hood or roof of a patrol car using a magnetic stand. With a remote control the radar can be controlled remotely.

Specifications
Device type radar
The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled driving directions all directions
Speed \u200b\u200bmeasurement mode stationary, patrol
Detection range up to 800 m
Speed \u200b\u200bmeasurement range 10-300 km / h
Measurement error ± 1 km / h

Radar "Berkut"
Police radar "Berkut" is designed to control the speed of single vehicles or cars in heavy traffic. Has the ability to choose the closest or fastest car. The radar is equipped with illumination of the indicator and buttons, which allows the traffic police inspector to record the speed of the car in the dark. "Berkut" can work for 10 hours without recharging and measure speed both stationary and in patrol mode. The radar is easy to use and can be easily mounted on the car dashboard. Depending on the situation, you can attach a handle, bracket or video clip to the device.

Specifications
Device type radar
The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled driving directions all directions
Stationary speed measurement mode
Detection range up to 800 m
Speed \u200b\u200bmeasurement range 20-250 km / h
Measurement error ± 2 km / h

Radar "Vizir"
While determining the speed, the "Vizir" radar carries out photographs and video recording of the offender's car, which helps the traffic police inspector in resolving disputes. The results of measurements of speed, as well as the control date and time are entered into the picture taken by the "Vizier". The device makes measurements in all directions and is capable of operating both stationary and in a patrol car. The radar has a built-in LCD display and a simple menu with conveniently located control keys. The device has a function of automatic measurement of speed and recording of traffic violations. "Vizir" can be connected to an external monitor and transfer data to a computer.

Specifications
Device type radar, video fixer
The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled driving directions all directions
Speed \u200b\u200bmeasurement mode stationary, patrol
Detection range up to 600 m
Speed \u200b\u200bmeasurement range 20-250 km / h
Measurement error ± 2 km / h

Strelka radar complex
The "Strelka" radar system accurately measures the speed of all vehicles within its coverage area (500 m from the installation site), regardless of the traffic density. The Strelka camera records the excess of the set speed limit at a distance of 350 to 50 m to the installation site and photographs the intruder's car with clearly distinguishable license plates. The received data is processed by a computer and transmitted to the information processing center via a fiber-optic line or radio channel.

Specifications

The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled directions of movement all directions (up to 4 lanes)
Speed \u200b\u200bmeasurement mode stationary, patrol
Detection range up to 500 m
Minimum detection range 50 m
Speed \u200b\u200bmeasurement range 20-300 km / h
Measurement error ± 1 km / h

The lineup
Strelka-01-ST is a stationary device installed above the roadway and transmitting information to the control center via fiber-optic communication.

“Strelka-01-STR” is a stationary device installed above the roadway and transmitting information to the control center via radio communication.

Strelka-01-STM is a mobile version of the device that can be installed on a patrol car.

Radar complex "Arena"
The hardware and software complex "Arena" is designed for automatic control of the speed limit on a certain section of the road. Preparing the complex for work takes about 10 minutes. "Arena" is installed on a tripod 3-5 m from the edge of the roadway. Vehicles that exceed the speed threshold are automatically photographed, and data on violations are transmitted to the traffic police post or stored in the device's memory. The radar complex is powered by a battery located nearby in a special box.

Specifications
Device type radar, photofixator, APC
The operating frequency of the speed meter is 24050-24250 MHz (K-band)

Stationary speed measurement mode
Detection range up to 90 m
Speed \u200b\u200bmeasurement range 20-250 km / h
Measurement error ± 2 km / h

Photoradar complex "Chris"
Photoradar complex "Chris" is designed for automatic recording of traffic violations, recognition of vehicle numbers, checking them against federal or regional databases and transmitting data to a remote traffic police post. The device is equipped with an infrared camera, which allows it to work at night. "Chris" is installed on a tripod near the edge of the roadway and will measure the speed of only those cars that are in the frame.

Specifications
Device type radar, photofixer
The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled driving directions all directions
Stationary speed measurement mode
Detection range up to 150 m
Speed \u200b\u200bmeasurement range 20-250 km / h
Measurement error ± 1 km / h

The lineup
"Chris-S" is the standard model of the photoradar complex.

"Chris-P" is an improved model with a new photoradar sensor.

Rapira-1 radar
Rapira-1 radar is used only for stationary measurement of vehicle speed; it can operate separately or as part of various hardware and software systems. The radar is installed at a distance of 4-9 meters above the road at an angle of 25 ° and allows you to determine the speed of the car in a narrow control zone.

Specifications
Device type radar, photofixer
The operating frequency of the speed meter is 24050-24250 MHz (K-band)
Controlled directions of oncoming traffic
Stationary speed measurement mode
Detection range up to 20 m
Speed \u200b\u200bmeasurement range 20-250km / h
Measurement error ± 2 km / h

Laser radar "Lisd-2"
Laser radar "Lisd-2" is designed to measure the speed and range to various objects, uses a narrow beam of light that allows you to identify a specific car in a dense traffic flow. The lidar is made in the form of binoculars with a telescopic sight, it works only stationary, but measures the speed in all directions. A shoulder strap can be attached and the device can be mounted on a tripod.

Specifications


Controlled driving directions all directions
Stationary speed measurement mode
Detection range up to 400 m
Speed \u200b\u200bmeasurement range 1-200 km / h
Measurement error ± 2 km / h
The lineup
"Lisd-2M" is the standard model of the lidar.
"Lisd-2F" is an improved model equipped with a photofixation unit.

Laser radar "Amata"
Laser radar "Amata" is able to accurately measure the speed and distance of vehicles and record traffic violations using photo or video. The device works on the basis of a laser speed meter, which allows you to reliably select the car that the traffic police inspector needs from a dense traffic stream. Lidar "Amata" is equipped with a target mark, which on the display of the device or in a photograph coincides with the direction of the laser beam and is proof of the measurement of the speed of a particular car.

Specifications
Device type lidar, photofixator
Laser wavelength 800-1100 nm
Controlled driving directions all directions
Speed \u200b\u200bmeasurement mode stationary, patrol
Detection range up to 700 m
Speed \u200b\u200bmeasurement range 1.5-280 km / h
Measurement error ± 2 km / h

Radar detector

Legality
The use of radar detectors is officially allowed in Russia, Ukraine, Belarus, Moldova, Kazakhstan and all other countries of the commonwealth, in the USA (except for the state of Virginia and Washington, DC), Great Britain, Iceland, Bulgaria, Romania, Slovenia, Albania, Israel, Japan, India, Pakistan, Taiwan, New Zealand.

Radar detectors are prohibited for use in Canada (except for the states of British Columbia, Alberta and Saskatchewan), Brazil, Finland, Norway, Sweden, Belgium, Ireland, Switzerland, Denmark, Germany, Austria, Holland, Luxembourg, France, Spain, Portugal, Italy , Greece, Croatia, Serbia, Slovakia, Poland, Hungary, Bosnia, Czech Republic, Estonia, Latvia, Lithuania, Turkey, Jordan, Singapore, Malaysia, Egypt, Saudi Arabia, UAE, South Africa, Australia (excluding Western Australia).

History


The world's first radar detector for motorists

Such gadgets were promoted through the Popular Electronics magazine (1961):

Later models:

Radar Detector Museum - www.radardetectormuseum.com

The insides of a modern radar detector SHO-ME 520 STR


Bottom view

With the radiator removed (in the comments, it was corrected - this is an HF screen. It is it that shields the heterodyne radiation, and also protects the receiving path from external interference. Thank you). Top left - laser detector, copper horn antenna below. Center - RF module. To the right - 3 control buttons. Right (white) - display

Under the HF screen

detailed description of components on a similar device

False signals are radio signals from outside devices operating in the ranges of police radars, but having nothing to do with the latter. For example, automatic shop doors can operate in the X- and K-bands, signals from satellite equipment can be detected by a radar detector in the X-band, radio signals of all ranges, as well as laser signals, can be detected in areas adjacent to airports.

Radar detectors use software and hardware methods to protect against false radio signals. Hardware methods involve installing specialized filters in the receiver of a radar detector, while software methods include special algorithms that can identify the radar signal and cut off its signal from interference. But sometimes these methods are not enough, especially when using a radar detector in an urban environment with a lot of interference from foreign devices. For this, all modern radar detectors have a manual change in the sensitivity of the device - switching between the "City" and "Highway" modes. Depending on the "jamming" situation, the driver can independently adjust the sensitivity of his device and minimize the number of false alarms of the radar detector.

Active radar detectors

Antiradar is an active type device. It is equipped not only with a radio receiver to detect the signal, but also a radio transmitter that emits a signal-interference. It is this signal that disrupts police radars: it mixes the radar signal with radio noise ("white noise"). The radar receiver receives a distorted signal and cannot determine the vehicle speed at which the radio signal was directed.

These devices are banned almost everywhere. This device is included in the list of devices included in the Law "On Counteracting Traffic Authorities".

Hack old school police radar

Having found grandfather's radar in the attic, the craftsman poked around with the oscilloscope and soldered the adapter from the radar to the laptop through the audio input. And then he successfully processed the signal on the computer.

P.S.

Bearded story

Two California Highway Patrol officers sat in ambush with radar on I-15, just north of the Marine Airfield at Miramar.
One of them set out to measure the speed of the cars leaving the hillock that is directly in front of them.
Suddenly ... the radar began to show 500 km / h.
The policeman tried to reset the radar program, but the program refused to reset, and then the radar itself turned off.
Then a deafening roar emanating from somewhere in the treetops explained that the radar was tracking a Marine F / A-18 Hornet (made by Northrop-Grumman), performing a low flight exercise nearby.

A police department captain has filed a complaint with the Marine Base Commander.
The answer that came back was in true Marine style:

“Thank you for your letter. We can finally close the folder with this incident. You may be interested in the fact that Hornet's tactical computer detected the presence and began tracking your enemy radar, which is why it sent a suppression signal, which caused your radar to shut down.
Further, the Air-to-Ground missile, which is part of the ammunition of a fully armed aircraft at that time, also automatically aimed at the location of your equipment.
Fortunately, the Marine pilot flying the Hornet correctly assessed the situation and, quickly responding to the missile system's alarm status, was able to intercept the automatic defense system before the missile was fired to destroy the enemy radar location.

The pilot also suggests that you keep your mouth shut when you swear at him, since the video system on this type of aircraft is very high-tech. Sergeant Johnson, the policeman holding the radar, needs to consult his dentist about a left posterior molar. It looks like the seal is loose.
In addition, his holster clasp is broken.

Thank you for your concern.

Semper Fi "

Tags:

• antiradar
• radar detector
• direction finder
• Electronic warfare

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ANTI-RADAR SCHEME

Probably every driver at least once had an idea to acquireanti-radar, especially after another racket of the traffic police on the road. So get down to business! But let's clarify right away:antiradar is an overwhelming devicepolice radar, and assembling it is a very difficult task. Here we look at more simple scheme antiradar - the so-calledradar - a detector that signals that an inspector is scanning your car.

To measure the speed of a car, the traffic police radar receives radiation reflected from the car, and the radar detector - direct, so the radar detector is always able to detect the radar earlier than it measures the speed of the car! So, if a traffic cop scans from his radar 500 m from the car, this is the range of the Vizir device, then before the car approaches a visible distance of 100 m you have the opportunity to slow down.

This anti-radar circuit is quite common on the network, and although I personally did not collect it, I had to fix such a homemade device. There, a microwave diode - the detector stood in a small funnel made of tin and the whole structure fit into a body soldered from foil PCB, the size of a pack of cigarettes. Under microwave irradiation, it blinked and peaked. Here is another version of the anti-radar circuit from the magazineRadio:

All radars in service with the traffic police operate at frequencies of 10525 MHz, 24150 MHz and 34700 MHz. These radar detectors are capable of detecting all of them.

Customization antiradar circuits can be performed while standing near a person with a radar;

Or so as not to light up, near the stationary radar - camera:

Sometimes they are placed a couple of kilometers in front of the traffic police post:

Recently, the authorities have adopted: The VIZIR radar video recording speed meter, consists of two independent units - a speed meter and a digital photo and video camera. The camera turns on both automatically when the driving car exceeds the pre-set speed limit, and manually - by an auto inspector. Surveillance cameras with built-in radar. The device works constantly, and when the speed is exceeded, a sensor is activated, which activates the camera.

You can find hundreds, maybe even thousands of different radar detectors on the market, but not all of them are equally good. What is the difference between a radar for 1000 rubles (for example, from aliexpress) and a device for 10-15 tons. Rubles? The price is naturally not justified by marketing "chips" of manufacturers, and today we will tell you what is inside modern radar detectors and how to choose the one that will not upset you on the road.

Let's start with the very basics. What is a radar detector? Radar is a passive radio signal receiver emitted by police speed cameras. I want to say right away that in this article we will analyze precisely the design of passive radar detectors, and not antiradar detectors (a radar detector is an active jammer that makes it impossible to measure vehicle speed).

• Radar detectors with active horn part
• Radar detectors with active horn and GPS
• GPS radars
• Signature radar detectors (technically, they can be classified as conventional radars, but in practice this is a completely new type of device).

The first group - this can be said to be where it all began. The simplest and most understandable type of device. From the name it is clear that you will not find anything in these devices except a horn and simple electronics.

It looks something like this

There is a horn antenna in front, which turns into a radio unit, next to it you see a unit for receiving laser signals. Of course, we will not talk about the scattering of transistors and the microcircuits themselves. All you need to pay attention to is the horn, the laser receiver and of course the processor itself. It should be understood that all old radar detectors and modern devices up to 3000 rubles are built on the same principle, we are of course interested in the latter. What is the disadvantage of this design? And the fact that the manufacturer is trying to save on almost everything. Pay attention to the antenna itself.

On the left, you see the horn of a modern radar detector, and on the right, an outdated one. I think the difference is visible even to an inexperienced user. And it seems to me, there is no need to tell which radar detector is more jam-resistant.

But it should be understood that conventional radar detectors without GPS are outdated technology and at the moment you should not pay attention to them, since there are cameras that cannot be detected by a radio signal (for example, AUTODORIA).

Radar detectors with an active horn and GPS are a more modern type of radar, but even here there are devices that should not be paid attention to. The selection principles are about the same. It is worth buying a radar - detectors with the most efficient radar part and a modern processor. How do you choose a really effective radar, you ask? That is why we are writing this article.

At the moment, the best offer in terms of price-quality ratio can be called Playme devices. All the brand's radar detectors are assembled at a Korean plant, and this really plays a big role (since the Korean radars can be called the accepted quality standard). For comparison, this is how the radar part of the Chinese radar looks like

It's not worth talking about circuitry. The board contains inexpensive transistors, the soldering quality leaves much to be desired, and the radar part itself is almost 2 times less (2 times less than that of the same PlaymeHARD)

It is also worth noting that at the moment the Korean radar is not synonymous with high cost. In this example, we used 2 devices. Korean Playme HARD and Chinese Omni RS-500. At the moment, HARD costs 5390, and the Chinese device is 7250.

Why is there such a difference, you ask? Why is the Korean radar detector cheaper? Because in Playme radar detectors you do not overpay for unnecessary features and marketing, which is very rare in modern devices. As an example, let's take a look at Neoline X-COP 5700 (which at the time of writing this review costs about 10,000). If we talk about the circuitry of the device, then you will not find anything special here. In almost all tests, the device showed itself to be average. The only functional difference of neoline is that the manufacturer has fastened to a conventional radar, which should cost no more than 5,000 rubles, the Motion Control function (turning off the sound warning with a wave of the hand) that is what we call marketing overpayment.

GPS radars are an obsolete type of radar. At the moment, there are practically no such devices. This is not surprising, since almost every second DVR has a GPS base of posts, radars and cameras, well, almost every radar has a GPS module. Why do we need GPS? We have already told, whether it is worth buying a device without a radar frequency, it's up to you to decide. At a fairly considerable price, GPS radars are inferior in functionality to conventional ones and have only one plus - this is size.

Signature radar detectors - as already mentioned, this is technically a conventional radar. The only difference is a super powerful processor that allows the device to analyze any incoming signals in a split second. For those who do not know, signature radars are called radars that are able to recognize a speed camera by its "signature". At the moment, only Playme devices can boast of truly working signature radars, which at the same time cost quite adequate money.

Summing up, I would like to say that this article serves as a kind of LIKBEZ for choosing radar detectors. Naturally, no online store will allow you to disassemble the radar before buying and make sure if everything is really so. I would like to express special gratitude to the engineers of the Playme company, who did not hesitate before this article (like most of the manufacturers we contacted) and provided us with their devices so that we could disassemble them and show you what is inside the most modern radars.

In this article from the What's Inside? we take a look inside the radar detector. Consider the Cobra iRad 500, this radar detector is designed to be paired with a mobile phone via a Bluetooth connection and should display various warnings on the phone screen. Initially, when this radar detector first appeared, its retail price was $ 130.

Overview

There is quite a lot of electronics inside the relatively simple housing of this radar detector. For example, there are 4 separate boards and 10 chips. Opening the case is quite simple, you only need to unscrew 4 screws. Electronic components located on a very neat module, which can be seen below.

Radar detector without housing

The main microcontroller can be seen on the underside of the main board. Interestingly, the female connector that can be seen above the ARM microcontroller protrudes from the bottom of the plastic case and is then covered with an FCC ID sticker.

Bottom side of the main board

Radar detector receiving horn

Top of the receiving horn antenna of the radar detector

The main part of any radar detector is its receiving horn antenna. The receiving horn of the radar detector is used to direct the radar waves to the detection circuit. After loosening a few screws, the horn splits in two, exposing the PCB.

Radar signal detection circuit

This board contains a superheterodyne receiver that is used to detect radars in three bands: X band (8 to 12 GHz), K band (18 to 27 GHz) and Ka band (27 to 40 GHz). This PCB does not contain simple copper tracks, but gold-plated ones. In addition, this board is made of a special dielectric designed for operation at ultra-high frequencies.

Additional board at the bottom of the receiving horn

Another PCB is attached to the bottom of the receiving horn. This option board amplifies and processes the signal detected by the receiver. These two printed circuit boards are connected by four soldered pins. The receive horn module is connected to the main board via a 2x4 connector. These PCBs have been soldered and can be seen in the image below.

Both boards of the receiving horn of the radar detector

Power supply

Two linear voltage regulators

Since the radar detector must always be connected to the network during operation, it uses several linear stabilizers to obtain the voltage necessary for the rest of the electronics to work. This device uses two 7800 series linear voltage regulators to supply 5V and 8V busbars. In addition, the third regulator is used to power the 3.3V rail.

One of the unique features of this particular radar detector is the built-in bluetooth module for transmitting data to a smartphone with the iRadar app installed. The bluetooth module is based on the single-chip CSR BC417143B system. This IC was designed to reduce the number of components required to implement a bluetooth radio.

Bluetooth chip

There are several ICs and passive components on the top side of the board, and there are circuit components on the bottom side as well. Most of the space on the underside of the Bluetooth module is taken up by the MX29LV800T flash memory module manufactured by Macronix International.

Flash memory chip

Audio

Another interesting design aspect of this radar detector is the number of components that have been added to create sound effects. The first component is a synthesizer originally manufactured by OKI Semiconductor. In 2014, OKI Semiconductor changed its name to Lapis Semiconductor. The radar detector uses a chip labeled L22422. This is very similar to the ML22420 from Lapis Semiconductor. It is interesting to note that both the ML22420 and L22422 have built-in amplifiers for 8 ohm speakers. This radar detector uses a separate audio amplifier to power an 8 ohm speaker.

Audio synthesizer and serial flash memory

A 16 Mbit Macronix MX25L1606E serial flash memory is connected to the speech synthesizer, which contains all the audio clips that the radar detector reproduces. The audio synthesizer accepts and uses data from flash memory to create sound effects. The audio signal from the speech synthesizer is then fed to an amplifier, which powers the speaker inside the radar detector.

Audio amplifier and auxiliary circuit

Since the radar detector is used in a car, where it can be quite noisy, its sound should be loud. A separate amplifier IC drives an 8 ohm speaker. At maximum volume, the speaker sounds surprisingly loud for its size.