How does a radio receiver work? Setting up the radio

13.02.2021Heading: Rates

You can use a radio to pass the time on the road. Typically, drivers prefer to listen to music that is unobtrusive, so that it plays in the background and does not interfere with steering. An autoradio is most suitable for this, which first needs to be configured. But many people don’t know how to properly set up the radio on their car stereo.

Basically, setting up the radio consists of several simple steps. The broadcast range is selected and radio channels are searched and stored in the tuner’s memory. The search for radio stations occurs either automatically or manual mode. In the first case, radio channels are stored in descending order of broadcast quality.

Let's take a closer look at how to configure the radio on common car radios.

Pioneer

If you are wondering how to set up the radio on your Pioneer radio, don’t worry, setup is very easy. When automatically setting up the Pioneer, press FUNC, followed by BSM. To start searching for radio channels, press the right or up button; after finishing, the music of the first radio station found will turn on.

For manual installation in BAND mode, long press >>|. A search will be launched for any first station within this radius. After which the device will stop scanning and start playing the found station. Then you will need to save it; to do this, hold the key with the desired number for a long time. If you do not need the found station, you need to press the right key and hold it. Scanning will continue until a new station is found.

With this function, you can store up to 6 stations in the first bank. After this manipulation, press the BAND button and get into the second bank, it is shown on the display as F2. In the second bank, you can similarly store up to 6 stations in memory, and there is also a third bank. Most often there are three banks, but there are more. As a result, if you have three banks, you will have 18 stations active and saved. Now you know how to set up the radio on your Pioneer radio.

Sony

Setting up the radio in the Sony radio will also not be a problem. Searching for stations is usually carried out in two common ways: manually or automatically. Automatic memorization of radio stations:

Turn on the radio. Long press the Source button and wait until TUNER appears on the display.
The range is changed by pressing the Mode button. If you press the joystick, a menu of options will appear.
Rotate the joystick until the VTM option appears. Radio channels are assigned to numbered keys as standard.

To manually scan and save you need:

Turn on the radio and start searching for stations.
Once the desired radio station has been found, you need to press the number key from 1 to 6, after which the name “Mem” will appear. Note: when saving a radio station on a digital number that already has a radio station, the previous one is automatically erased.

Thus, you can set up a radio in a Sony radio in 5-10 minutes.

Supra

After pressing the MODE button, select the Radio function, then RADIO and the saved band with the broadcast frequency will be displayed on the screen. Pressing BND selects the desired broadcast band.

Press and hold the >>|| button.

Then click the button >>|| to select the desired station. If these keys are not pressed for up to ten seconds, everything will return to its original operating mode.

Automatic tuning and scanning of selected radio stations

Search for existing radio stations in memory:

Briefly press the AS/PS key to start searching for saved radio channels. Any station can be listened to for about a couple of seconds. To automatically save radio channels, hold down the AS/PS key. The receiver will tune in to six optimal stations, which are the most powerful in this broadcast range. This option can be used in any wavelength range. Once the automatic saving of stations is completed, the receiver will stop scanning them.

To tune into a specific radio station, press the >>|| button, this will scan and select radio channels with the best reception signal. By pressing the >>|| button, you can manually select the station you want. Hold down the key numbered 1 to 6 for about a couple of seconds to memorize the channel under the desired key.

J.V.S.

When tuning stations, it is possible to leave 30 FM radio channels and 15 AM channels in the tuner.

Installing stations manually:

Select a broadcast band by pressing the TUNER BAND key.
Click on button 4 to set the station.
Hold down the key with any selected number on the panel to memorize the station in the radio's memory. The selected number will start blinking, after which you will see the station stored under the selected number. For example: To tune to station number 14, press the +10 key, followed by the 4 key for approximately three seconds or more.
To store other radio stations in the device’s memory, you need to repeat steps one through three. And to change the settings of the entire station, you need to repeat the entire process from the beginning.

Tuning stations in automatic mode:

Stations will be given numbers by increasing the frequency range.

Select the range by pressing the TUNER BAND key.
Press and hold the AUTO PRESET button on the panel.
To set a different range, you need to go through steps one through two again.

To replace selected stations in automatic mode, you must use manual installation.

Kenwood

Kenwood radios offer three types of autoradio settings: automatic (AUTO), local (LO.S.) and manual.

Press SRC until “TUnE” appears.
Press FM or AM to select a band.

For automatic setup, click >>| or |.

In case of manual tuning, after all the above steps, ST will light up, indicating the found station.

Dear visitors!!!

If we compare outdated and modern models of radios, they of course have their differences both in design and in electrical circuits. But the basic principle radio signal reception- not changeable. For modern models radio receivers, only the design itself changes and minor changes are made to the electrical circuits.

As for tuning the radio receiver to the wave, receiving transmissions in the ranges for:

long waves\LW\;
medium waves \NE\,

- usually carried out using a magnetic antenna. In ranges:

— radio sound reception is received via a telescopic \outdoor\ antenna.

Figure 1 shows appearance and graphic designation of receiving antennas:

telescopic;

magnetic \antenna DV and SV\.

Reception by magnetic antenna

Figure No. 2 shows a visual representation of how radio waves bend around obstacles \for mountainous areas\. The radio shadow region is represented as a zone beyond the reach of radio waves by the receiver.

What is a magnetic antenna? — The magnetic antenna consists of a ferrite rod, and the magnetic antenna coils are wound on separate \isolated\ frames. The ferrite rod of a magnetic antenna for different radios has its own diameter and length. The winding data of the coils, accordingly, also have their own specific number of turns and their own inductance - for each of these magnetic antenna circuits.

As you understand, such concepts in radio engineering as each individual magnetic antenna circuit And magnetic antenna coil, - have the same meanings, that is, you can formulate your proposal in one way or another.

In radio receivers, a magnetic antenna for DV and SV is mounted in the upper part. In the photograph, the magnetic antenna looks like an oblong, cylindrical rod made of ferrite.

If each coil \circuit\ of a magnetic antenna has its own inductance, then it is designed to receive separate ranges of radio waves. For example, according to electrical diagram radio receiver You observe that the magnetic antenna consists of five separate circuits \L1, L2, L3, L4, L5\, two of which are necessary for the received range:

DV \L2\;
NE \L4\.

Other circuits L1 L3 L5 are communication coils, one of which, say L5, is connected to an external antenna. This explanation is not given specifically for each circuit, because the meaning of the symbols in the circuits may change, but a general concept of a magnetic antenna is given.

Reception-on telescopic antenna

telescopic radio antenna

Depending on the radio receiver circuit, the telescopic \whip antenna\ can be connected either to the input circuits of the long and medium wave ranges through a resistor and a coupling coil, or to the input circuits of the short wave range - through an isolating capacitor. From the taps of the coils of the DV, SV or HF circuits, the signal voltage is supplied to the input of the RF amplifier.

Winding data - antennas

The winding on the circuits is made with a single or double wire. Each circuit has its own inductance. The amount of loop inductance is measured in henry. To independently rewind a circuit, you need to know the winding data of this circuit. That is, you need to know:

number of turns of wire;
wire section.

All the necessary technical data for outdated models of radios could be found in reference books. At this time, there is no such literature for modern models of radios.

For example, for receivers:

Mountaineer-405;
Giala-404,

— the winding data of the coils coincided with each other. That is, let’s say the communication coil \and there are several of them - in the diagram\ with its designation, it could be replaced from one receiver circuit to another circuit.

A circuit malfunction is most often associated with mechanical damage to the wire \accidentally touching the wire with a screwdriver and so on\. When repairing a circuit \rewinding it\, the number of turns of the old wire is usually taken into account and then the same number of turns are performed with a new wire, where its cross-section is also taken into account.

In this article, we have partially gained an understanding of sound reception by a radio receiver. Follow the section, it will be even more interesting further.

Greetings! In this review I want to talk about a miniature receiver module operating in the VHF (FM) range at a frequency from 64 to 108 MHz. I came across a picture of this module on one of the specialized Internet resources, and I became curious to study it and test it.

I have a special awe for radios; I have loved collecting them since school. There were diagrams from the magazine “Radio”, and there were just construction kits. Every time I wanted to build a better and smaller receiver. The last thing I assembled was a design on the K174XA34 microcircuit. Then it seemed very “cool”, when in the mid-90s I first saw a working circuit in a radio store, I was impressed)) However, progress is moving forward, and today you can buy the hero of our review for “three kopecks”. Let's take a closer look at it.

View from above.

View from below.

For scale next to the coin.

The module itself is built on the AR1310 chip. I couldn’t find an exact datasheet for it, apparently it was made in China and its exact functional structure is not known. On the Internet you can only find wiring diagrams. A Google search reveals: "This is a highly integrated, single-chip, stereo FM radio receiver. The AR1310 supports the FM frequency range of 64-108 MHz, the chip includes all FM radio functions: low noise amplifier, mixer, oscillator and low-dropout stabilizer. Requires a minimum of external components. Has good audio signal quality and excellent reception quality. AR1310 does not require control microcontrollers and no additional software, except 5 buttons. Operating voltage 2.2 V to 3.6 V. consumption 15 mA, in sleep mode 16 uA ".

Description and specifications AR1310
- Reception of FM frequencies range 64 -108 MHz
- Low power consumption 15 mA, in sleep mode 16 uA
- Supports four tuning ranges
- Using an inexpensive 32.768KHz quartz resonator.
- Built-in two-way auto search function
- Support electronic volume control
- Supports stereo or mono mode (when contacts 4 and 5 are closed, stereo mode is disabled)
- Built-in 32 Ohm Class AB headphone amplifier
- Does not require control microcontrollers
- Operating voltage 2.2V to 3.6V
- In SOP16 housing

Pinout and overall dimensions of the module.

AR1310 microcircuit pinout.

Connection diagram taken from the Internet.

So I made a diagram for connecting the module.

As you can see, the principle couldn’t be simpler. You will need: 5 tact buttons, a headphone jack and two 100K resistors. Capacitor C1 can be set to 100 nF, or 10 μF, or not at all. Capacitances C2 and C3 from 10 to 470 µF. As an antenna - a piece of wire (I took a MGTF 10 cm long, since the transmitting tower is in my neighboring yard). Ideally, you can calculate the length of the wire, for example at 100 MHz, by taking a quarter wave or one eighth. For one eighth it will be 37 cm.
I would like to make a remark regarding the diagram. AR1310 can operate in different bands (apparently for faster station search). This is selected by a combination of pins 14 and 15 of the microcircuit, connecting them to ground or power. In our case, both legs sit on VCC.

Let's start assembling. The first thing I encountered was the non-standard pin-to-pin pitch of the module. It is 2 mm, and it will not be possible to fit it into a standard breadboard. But it doesn’t matter, I took pieces of wire and just soldered them in the form of legs.

Looks good)) Instead of a breadboard, I decided to use a piece of PCB, assembling a regular “fly board”. In the end, this is the board we got. The dimensions can be significantly reduced by using the same LUT and smaller components. But I didn’t find any other parts, especially since this is a test bench for running.

After applying power, press the power button. The radio receiver worked immediately, without any debugging. I liked the fact that the search for stations works almost instantly (especially if there are many of them in the range). The transition from one station to another takes about 1 s. The volume level is very high, it is unpleasant to listen to at maximum. After turning off the button (sleep mode), it remembers the last station (if you do not completely turn off the power).
Sound quality testing (by ear) was carried out using Creative (32 Ohm) drop-type headphones and Philips vacuum-type headphones (17.5 Ohm). I liked the sound quality in both. There is no squeakiness, a sufficient amount of low frequencies. I'm not much of an audiophile, but I was pleasantly pleased with the sound of the amplifier of this microcircuit. I couldn’t turn up the maximum volume in the Philips, the sound pressure level was painful.
I also measured the current consumption in sleep mode 16 μA and in working mode 16.9 mA (without connecting headphones).

When connecting a load of 32 Ohms, the current was 65.2 mA, and with a load of 17.5 Ohms - 97.3 mA.

In conclusion I will say that this module The radio receiver is quite suitable for domestic use. Even a schoolchild can assemble a ready-made radio. Among the “cons” (more likely not even cons, but features) I would like to note the non-standard pin spacing of the board and the lack of a display to display information.

I measured the current consumption (at a voltage of 3.3 V), as we see, the result is obvious. With a load of 32 Ohms - 17.6 mA, with 17.5 Ohms - 18.6 mA. This is a completely different matter!!! The current varied slightly depending on the volume level (within 2 - 3 mA). I corrected the diagram in the review.

Planning to buy +113 Add to favorites I liked the review +93 +177

The high-frequency block contains a converter stage, input and heterodyne circuits. In receivers of the first and highest classes, as well as in the VHF range, there is a high-frequency amplifier in front of the converter. Checking and adjusting the high-frequency unit can be divided into three stages: 1) checking local oscillator generation; 2) determining the boundaries of the range, often called range laying; 3) pairing of input and heterodyne circuits.

Laying ranges. The tuning of the receiver to the received station is determined by the tuning of the local oscillator circuits. Input and UHF circuits only increase the sensitivity and selectivity of the receiver. When tuning it to different stations, the local oscillator frequency must always differ from the received frequency by an amount equal to the intermediate one. To ensure constant sensitivity and selectivity over the range, it is desirable that this condition be met at all frequencies in the range. However, this is the frequency ratio over the entire range

is ideal. With one-handed setup, it is difficult to obtain such a pairing. Local oscillator circuits used in broadcast receivers provide precise matching of the settings of the input and local oscillator circuits in each band at only three points. In this case, the deviation from ideal conjugation at other points of the range turns out to be quite acceptable (Fig. 82).

For good sensitivity on the KB range, two precise pairing points are sufficient. The necessary relationships between the frequencies of the input and heterodyne circuits are achieved by complicating the circuit of the latter. The heterodyne circuit, in addition to the usual tuning capacitor C 1 and tuning capacitor C2, includes an additional capacitor SZ, called a mating capacitor (Fig. 83). This capacitor (usually a fixed capacitance with a tolerance of ±5%) is connected in series with a variable capacitor. The inductance of the local oscillator coil is less than the inductance of the input circuit coil.

To correctly determine the boundaries of the range, you must remember the following. The local oscillator frequency at the beginning of each range is mainly affected by a change in the capacitance of the tuning capacitor C 2, and at the end of the range - by a change in the position of the inductor core L and the capacitance of the mating capacitor SZ. The beginning of the range can be considered the maximum frequency to which the receiver can be tuned in a given range.

When starting to set up the local oscillator circuits, you should find out the sequence of settings by range. In some receiver circuits, the CB band loop coils are part of the DV band loop coils. In this case, you need to start tuning with medium wave and then tune to long wave.

Most receivers use a band switching scheme that allows each band to be adjusted independently. Therefore, the configuration sequence can be any.

The range is set using the two-point method, the essence of which is to set the limit of the highest frequency (beginning of the range) using a tuning capacitor, and then the lower frequency (end of the range) with the core of the loop coil (Fig. 84). But when setting the limit of the end of the range, the setting of the beginning of the range is somewhat lost. Therefore, you need to check and adjust the beginning of the range again. This operation is performed until both points in the range are in compliance with the scale.

Pairing of input and heterodyne circuits. The setting is made at two points and checked at the third. The exact coupling frequencies in receivers with an intermediate frequency of 465 kHz for the middle of the range (f cf) and ends (f 1 and f 2) can be determined by the formulas:

The circuits are paired at design points, which for standard broadcasting ranges have the following values

In individual radio models, the pairing frequencies may vary slightly. The lower precision coupling frequency is usually selected 5...10% higher than the minimum frequency of the range, and the upper frequency is 2...5% lower than the maximum. Capacitors with variable capacitance allow you to tune the circuits to exact matching frequencies when turning at angles of 20...30, 65...70 and 135...140°, measured from the position of the minimum capacitance.

To configure tube radio receivers and achieve pairing, the output signal of the generator is connected to the input of the radio receiver (Antenna, Ground sockets) through the all-wave equivalent of the antenna (Fig. 85). Transistor radios that have an internal magnetic antenna are tuned!: using a standard field generator, which is a loop antenna connected to the generator through a non-inductive resistor with a resistance of 80 Ohms.

The decade divider at the end of the generator cable is not connected. The antenna frame is made square with a side of 380 mm from copper wire with a diameter of 4...5 mm. The radio receiver is located at a distance of 1 m from the antenna, and the axis of the ferrite rod should be perpendicular to the plane of the frame (Fig. 86). The magnitude of the field strength in μV/m at a distance of 1 m from the frame is equal to the product of the readings of the generator's smooth and step attenuators.

In the KB range there is no internal magnetic antenna, so the signal from the generator output is supplied to the external antenna socket through a capacitor with a capacity of 20...30 pF or to a whip antenna through an isolation capacitor with a capacity of 6.8...10 pF.

The receiver is tuned on a scale to the highest precise coupling frequency, and the signal generator is adjusted to the maximum voltage at the receiver output. By adjusting the tuning capacitor (trimmer) of the input circuit and gradually reducing the generator voltage, we achieve a maximum increase in the output voltage of the receiver. Thus, pairing is carried out at this point in the range.

Then the receiver and generator are tuned to a lower precise coupling frequency. By rotating the core of the input circuit coil, the maximum voltage is achieved at the output of the receiver. For greater accuracy, this operation is repeated until the maximum voltage at the receiver output is reached. After adjusting the contours at the edges of the range, check the accuracy of the pairing at the middle frequency of the range (third point). To reduce the number of tunings of the generator and receiver, the operations of setting the range and pairing the circuits are often performed simultaneously.

Setting up the LW band. The standard signal generator remains connected to the receiver circuit through the equivalent of an antenna. The generator is set to the lower frequency of the range 160 kHz and output voltage 200...500 µV at a modulation depth of 30...50%. The lower coupling frequency is set on the receiver scale (the rotation angle of the KPI rotor is approximately 160...170°).

The gain control is moved to the maximum gain position, and the band control is moved to the narrow band position. Then, by rotating the core of the heterodyne circuit coils, the maximum voltage is achieved at the output of the receiver. Without changing the frequencies of the generator and receiver, the coils of the UHF circuits (if any) and input circuits are adjusted in the same way until the maximum voltage is obtained at the output of the receiver. At the same time, the generator output voltage is gradually reduced.

Having adjusted the end of the DV range, set the variable capacitor to the position corresponding to the coupling point at the highest frequency of the range (KPI rotation angle 20...30°). The generator frequency is set to 400 kHz, and the output voltage to 200...600 µV. By rotating the trimming capacitors of the circuits, first the local oscillator, and then the UHF and input circuits, the maximum output voltage of the receiver is achieved.

Tuning the circuits at the highest frequency of the range changes the tuning at the lower frequency. To increase the accuracy of the settings, the described process must be repeated in the same sequence 2...3 times. When re-adjusting the rotor, the KPI should be placed in the previous position, i.e. in the one in which the first adjustment was carried out. Then you need to check the accuracy of the pairing in the middle of the range. The frequency of the exact pairing in the middle of the LW range is 280 kHz. By setting this frequency on the generator and receiver scale respectively, the calibration accuracy and sensitivity of the receiver are checked. If there is a dip in the sensitivity of the receiver in the middle of the range, then it is necessary to change the capacitance of the coupling capacitor and repeat the tuning process.

The final stage is checking that the settings are correct. To do this, a test stick, which is an insulating rod (or tube) with a ferrite rod fixed at one end and a copper rod at the other, is inserted into the tuned circuit first with one end and then with the other end. If the adjustment is made correctly, then when any end of the test stick is brought to the circuit coil field, the signal at the receiver output should decrease. Otherwise, one end of the stick will reduce the signal, and the other will increase it. After the LW band is configured, you can similarly configure the MW and HF bands. However, as already noted, on the HF band it is enough to pair at two points: at the lower and upper frequencies of the range. In most radio receivers, the KB range is divided into several subbands. In this case, the exact pairing frequencies have the following values!

Features of setting the HF range. When tuning the HF band, the signal from the generator can be heard in two places on the tuning scale. One signal is the main one, and the second is the so-called mirror signal. This is explained by the fact that on the HF band the mirror signal is suppressed much worse, and therefore it can be confused with the Main signal. Let us explain this with an example. A voltage with a frequency of 12,100 kHz is applied to the receiver input, i.e., the beginning of the HF range. In order to obtain a frequency equal to the intermediate frequency at the output of the frequency converter, i.e. 465 kHz, it is necessary to adjust the local oscillator to a frequency equal to 12,565 kHz. When the local oscillator is tuned to a frequency of 465 kHz below the received signal, i.e. 11,635 kHz, an intermediate frequency voltage is also provided at the output of the converter. Thus, the intermediate frequency in the receiver will be obtained at two frequencies, the local oscillator, one of which is higher than the signal frequency by the amount of the intermediate frequency (correct), and the other lower (incorrect). In percentage terms, the difference between the correct and incorrect local oscillator frequencies is very small.

Therefore, when setting the HF range, you should choose from two local oscillator settings the one that is obtained with a lower capacitance of the circuit capacitor or with a more inverted coil core. The correct setting of the local oscillator is checked at a constant frequency of the generator signal. When increasing the capacitance (or inductance) of the local oscillator circuit, the signal should be heard in one more place on the receiver scale. You can also check the correctness of the local oscillator settings while keeping the receiver settings unchanged. When the frequency of the generator signal changes to a frequency equal to two intermediate ones, i.e., 930 kHz, the signal must also be heard. The higher frequency in this case is called the mirror frequency, and the lower frequency signal is the main one.

Setting up the antenna filter. Setting up the high frequency unit begins with setting up the antenna filter. To do this, the output signal of the generator is connected to the input of the receiver through the equivalent of an antenna. On the frequency scale of the generator, a frequency of 465 kHz and a modulation depth of 30...50% are set. The output voltage of the generator must be such that the output meter connected to monitor the output voltage of the receiver shows a voltage of the order of 0.5... 1 V. Receiver range switch set to the DV position, and the tuning pointer to the frequency of 408 kHz. By rotating the core of the antenna filter circuit, achieve a minimum voltage at the receiver output, while increasing the output voltage of the generator as the signal weakens.

After completing the setup, all adjusted cores of the loop coils and the positions of the magnetic antenna coils must be fixed.

Sometimes the most ordinary things are confusing. Setting up the radio receiver on individual car brands is done differently. In this article we will examine in detail how this mysterious process occurs in the Kia Rio.

RADIO CONTROL

Selecting the FM/AM frequency range

Press the FM-AM button to select the frequency band as follows: FM AM FM

Manual radio tuning

To manually tune to a radio station, press the or button and hold it down for at least 2 seconds. Then press the or button to increase or decrease the radio frequency.

Automatic search for radio stations

When you press the or button briefly, the automatic search in ascending or descending order of radio reception frequency.

The search will stop when the radio finds the next highest frequency radio station. If, after a complete traversal of the range, no new station is found, the radio receiver will stop at the frequency with which the search was started.

Radio station preset buttons

To select a preset radio station, briefly (no longer than 2 seconds) press the corresponding button.
If the button is pressed for more than 2 seconds, the currently received radio station will be stored in the memory instead of the previously programmed radio station.
Six radio stations can be programmed for the FM and AM bands.

Tuning the radio using the list of radio stations

By successively pressing the button, the mode of the list of radio stations will change as follows. as follows: List mode (list of radio stations) Preset mode (pre-programmed radio stations) List mode (list of radio stations)

Selecting a radio station from the list

Select station list mode or preset station mode by pressing the button
Press the or button to select the next or previous radio station from the list of radio stations or from preset radio stations.
If the tuning mode for pre-programmed radio stations is turned on, you can select one of six radio stations, the frequencies of which are stored in the radio's memory cells. However, in the radio station list mode, you can memorize up to 50 radio stations with a sufficiently strong signal in the FM or AM frequency ranges.
If, when the radio station list mode is on, hold the button down for more than 2 seconds, the radio receiver finds and remembers the operating frequencies of radio stations with the strongest signal, broadcasting in the FM or AM range. It may take some time to update the list of radio stations.
If the radio station that is received in this moment, is not an RDS radio station, then instead of the name of the radio station, the broadcast frequency is displayed.
The RDS radio data system allows, simultaneously with the main FM radio signal, to transmit additional information in encoded digital form. The RDS system supports various information and service functions, such as displaying the name of the radio station, receiving traffic messages and local news, and automatically searching for a radio station broadcasting a program of a certain genre.

Alternate Frequency (AF)

The AF function for selecting alternative radio frequencies can operate in any mode except for receiving AM stations.

To enable this mode, press the SETTING button, the setup menu will appear on the display. Select the Audio Settings menu and press the (Down) button to enter AF mode, then press the ENTER button to ON. Each time you select the AF function, its status alternates between ON and OFF. When the AF function is turned on, “AF” appears on the display.

Automatic radio tuning function

The radio receiver compares the power of radio signals at all alternative frequencies, and automatically selects and tunes to the broadcast frequency that provides the best conditions for receiving radio transmissions.

Search by information type code (PI)

If, as a result of searching through the list of alternative frequencies AF, the radio receiver does not find any acceptable stations, then it automatically proceeds to search for a radio station using the PI code. During a PI code search, the radio searches for all RDS radio stations with the same PI code. During PI code searching, the sound is temporarily muted and “SEARCHING” appears on the display. The PI code search stops as soon as the radio finds a suitable radio station. If, after checking the entire frequency range, no station could be found, the search stops and the radio returns to the previously tuned frequency.

Extended EON Network Data Update (This function also works when AF function is off)

Receiving Enhanced EON Network data allows you to automatically retune the frequencies of pre-programmed stations to the same radio network. In addition, it becomes possible to use additional service functions provided by the network, for example, receiving traffic messages. If the radio operates in the FM band and is tuned to an RDS radio station that is part of the EON extended network, the EON indicator appears on the display.

PS function (radio station name display)

When the radio is tuned to an RDS station (manually or semi-automatically), reception of RDS radio data begins and the name of the station being received is shown on the display.

Function to interrupt the current mode with an alarm signal (ALARM INTERRUPTION-EBU SPEC FOR INFO)

If the radio receiver receives the PTY31 alarm code, the current operating mode of the audio system is automatically interrupted and a message broadcast begins with the message “PTY31 ALARM” indicated on the display. The volume level will be the same as when transmitting traffic messages. After the warning message ends, the audio system will immediately return to its original operating mode.

Local radio reception mode (REG)

Some local radio stations are united into a regional network, since each of them covers only a small area due to the lack of the required number of repeaters. If the signal received from a radio station becomes too weak during a trip, the RDS system automatically switches the audio system to another local radio station with a stronger signal.

If you turn on REG mode when the radio is on the FM band and tuned to a local radio station, the radio setting will be saved and switching to other local radio stations will not occur.

To enable this mode, press the SETTING button, the setup menu will appear on the display. Select the Audio Settings menu and press the (Down) button to move to REG mode, then press the ENTER button to ON. When you select the REG function sequentially, it alternates between ON and OFF. When the REG function is turned on, “REG” appears on the display.

Traffic announcement mode (TA)

This function can operate in any mode except for receiving AM stations.

To enable this mode, press the SETTING button, the setup menu will appear on the display. Select the audio system settings menu and press the ‘ (down) button to enter the TA mode, and then press the ENTER button to the ON position. Each time the TA function is selected, its state alternates between ON and OFF. When the TA function is turned on, the inscription “TA” appears on the display.

The TA mode is activated by pressing the TA button. After turning on this mode, the TA indicator lights up on the display. TA mode works regardless of whether AF mode is on or off.

Function to interrupt the current mode with traffic information

If the TA function is turned on, then when the radio detects a traffic announcement, reception of the current radio station or CD playback is interrupted. The message “TA INTERRUPT INFO” appears on the display, followed by the name of the radio station broadcasting the traffic announcement. The sound volume will be adjusted to the preset level.

After the traffic announcement ends, the audio system returns to the previously selected signal source and previously set volume level.

If the audio system is tuned to an EON radio station and another EON network radio station is broadcasting a traffic announcement, the radio will automatically switch to the EON radio station broadcasting the traffic announcement. When the traffic announcement ends, the audio system will return to the previous signal source.

The interruption of the initial mode for broadcasting a traffic announcement is canceled if the TA button is pressed during the broadcast of a traffic announcement. In this case, the TA function returns to standby mode.

This function can operate in any mode except for receiving AM radio stations. The RTU mode is activated if the PTY ON state is activated in the RTU program type selection menu, or if the RTU button is pressed to the ON state. The PTY symbol appears on the display

Radio program type selection mode PTY

To install the required type of RTU radio program, do the following.

Press the SETTING button.
Press the (down) button to move to MOUTH, then press the ENTER button.
Select the desired program type from the menu, then press the ENTER button to confirm your selection.
Set the RTU function to ON. During successive selections of the RTU function, it is alternately turned on (ON) and turned off (OFF).

After setting, to return to normal display mode, press the | Press the CD or FM-AM button three times or once.

Search function by specified PTY program type

The audio system is switched on to the search mode for a given type of RTU program when you press the search button or

If a radio station broadcasting the selected type of program is found during the search, the radio will stop at that radio station and the sound volume will be adjusted to the preset level for the RTU function. If you want to find another radio station broadcasting the same type of program, press the search button again.

The PTY standby mode can be turned on when the audio system is operating in any mode except for receiving AM radio stations.

Press the PTY button to turn off PTY standby mode. The PTY indicator on the display will go off.

If the radio detects a program with the required PTY code from the radio station to which the receiver is tuned or an EON radio station, an interrupt signal is sounded and the name of the PTY radio station is displayed. The name of the interrupting PTY radio station will appear on the display and the sound volume will be adjusted to the level set for the PTY function

If you press the TA button in PTY interrupt mode, the radio will return to the previous playback source. However, in this case, the interrupt standby mode is of the type PTY programs remains on.

In PTY interrupt mode, if you press the FM-AM frequency band selection button or the CD player button, the audio system will switch to the corresponding signal source. However, the PTY interrupt standby mode remains enabled.

If the radio is tuned to a station that does not broadcast RDS/EON radio data, when you switch the audio system to CD playback mode, the radio will automatically retune to an RDS/EON radio station that broadcasts this data.

After returning to radio mode, it continues to receive the preset radio station.

Automatic retuning of the radio receiver is carried out in the following cases:

If, with the AF function turned on and the TA function turned off, there is no RDS radio data for 25 seconds. or more.
If, with the AF function turned off and the TA function turned on, the radio receiver for more than 25 seconds. does not receive a signal from a station transmitting npoi traffic messages.
If, when the AF and TA functions are turned on, the radio receiver for more than 25 seconds. does not receive a signal from the RDS station broadcasting the traffic program.

Volume control mode

To set the SPEED VOL function (volume compensation level depending on the speed of the vehicle), as well as to set the volume level for the PTY/TA functions, do the following:

Press the SETTING button.
Press the (down) button to move to Audio, then press the ENTER button.
Press the (Down) button to move to “Speed Sensitive Volume” or PTY/TA, then press the ENTER button.
Press the (Left) or (Right) button to adjust the volume.
Press the ENTER button to confirm your selection.

To return to normal display mode, press the button twice or press either CD or FM/AM button once.

Note: If this function is active, the higher the vehicle speed, the higher the volume level.

Thus, the multimedia radio system conceals some secrets that can surprise with their applicability and simplification of the life of a car enthusiast.

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