So, you have purchased a MegaJet radio station, installed it in your car. And now the most interesting thing is left for you - to configure it. But how to do that? The method of arbitrary pressing of the buttons will not work. Reading instructions that are replete with scientific radio engineering terms is also not very interesting and takes time. We offer you a short article with practical tips for setting up your radio station:
- The first step is to switch the radio to 240 channel mode. To do this, enter the combination "AM / FM -> ON";
- If you press the buttons incorrectly, you can reset all settings, you need to press "CH9 -> ON" to reset the settings, the screen will display "Reset";
- To switch to the Russian grid, you need to dial the combination "DW / M2-> ON". After that, you can see on the screen that the frequencies end with 0. On the Euro grid, the frequencies end with 5, please note that most often drivers and truckers use the European band grid;
- You can check the radio in this way by turning on, for example, the channel for truckers C15E AM at a frequency of 27.135, where “C” is the grid, “15” is the channel number, “E” is the European band grid, “AM” is amplitude modulation;
- You can set up the antenna yourself. You can install the original antenna or purchase another brand that is compatible with your radio.
For full customization your radio station in any case, you need to read the instructions or take the help of specialists.
But if you do not want to deal with the manual or you simply do not have time for this, then we suggest using the services of our specialists in setting up and programming radio stations. They will professionally perform the work in a short time, give you valuable recommendations and tips on how to use it.
CB car/base radio (CB) range MegaJet MJ-3031M Turbo
The MegaJet MJ-3031M Turbo radio station has a power of up to 20 W, operates in the Russian and European frequency grids, 320 channels each. An interesting design of the front panel "under the tree" will decorate the interior of any car, and the rich functionality and high power transmitter makes this model very attractive.
Other features of the Megajet 3031 Turbo radio include quick switching between grids with one key and a high-contrast Black Matrix color display, which displays all the data on the CB transceiver's operating mode, including indication of the receive and transmit channel, operating frequency and signal level, and also the type of modulation, channel number, etc.
The transistors of the output stages are equipped with heatsinks to improve heat dissipation during transmission operation and to ensure stable radio signal parameters at power up to 20 watts.
A high-quality automatic noise reduction (ASQ) system cuts out some of the extra noise and makes operation simple and enjoyable. Fine-tuning of the frequency is provided by a microprocessor control system with phase-locked loop. Already mandatory for CB radio stations, the SCAN mode is supplemented by the ability to listen to two selected channels (Dual Watch).
Non-volatile memory ensures the safety of user settings and channels when the external power is turned off. Like all popular CB radio stations, the Megajet MJ-3031M Turbo model has the ability to connect an external speaker, the backlight of the panel and control buttons, a convenient frequency channel selector, the ASQ key and channel switching are duplicated on the control PTT, as well as the "0" button for quick transition to the "Russian" frequency grid.
The car radio station Megajet MJ-3031m Turbo differs from the Megajet MJ-3031m in the presence of increased output power - up to 20 W, the presence of a separate Europe-Russia grid switching button.
Features MegaJet MJ 3031M Turbo:
Maximum output power 20W
. Microprocessor control system with precision phase-locked loop (PLL) based on P516 (8995) processor
. Non-volatile memory of memory cells and settings
. Mahogany decorative front panel with large Black Matrix color LCD display
. Automatic Noise Reduction System
. Powerful heatsink for cooling the output stages
. Dual channel monitoring (DW)
. Scanning frequency channels
. RX/TX signal level indicator
. Frequency value display
. Control panel backlight
. Emergency tuning to emergency channels
. Connector for external speaker
. Memory for 4 frequency channel
. Country of manufacture: Korea.
Main characteristics
Frequency range, MHz | 25.615-28.755 MHz |
Number of frequency channels | 320R+320E |
Transmitter output power, W | up to 20 |
Type of modulation | Frequency (FM) and amplitude (AM) modulation |
Supply voltage, V | 13.8 |
Current consumption | no more than 2.5 A |
Antenna impedance | 50 ohm |
External speaker impedance | At least 8 ohm |
Working temperature | -10 to +50°C |
Dimensions, mm | 159 x 48 x 138 |
Weight, g | 870 |
Speaker | 84 mm; 8 ohm; 1.0 W |
Receiver
Transmitter
Contents of delivery:
Radio station 1 pc.
. PTT with cable and connector 1 pc.
. Radio station mounting bracket 1 pc.
. PTT mounting bracket 1 pc.
. Mounting screw set 1 pc.
. Spare fuse 1 pc.
. Instruction manual 1 pc.
. Package.
Instructions for using the car / base CB radio station MegaJet MJ-3031M
READ THIS TECHNICAL DESCRIPTION BEFORE USING YOUR MegaJet MJ-3031M RADIO.
INTRODUCTION
SPECIFICATIONS
APPOINTMENT OF GOVERNING BODIES
MULTI-FUNCTION LCD DISPLAY
INSTALLING THE RADIO IN THE CAR
INSTALLATION AND SETUP OF THE VEHICLE ANTENNA
TERMS OF USE OF THE RADIO STATION
INTRODUCTION
Car CB radio station MegaJet MJ-3031M is developed on the basis of modern technologies and is the first model of CBS radios of a new generation.
The MegaJet MJ-3031M radio transmitter has a maximum radiated power of 10 W for this class and high-quality modulation. In addition, the radio's receiver is a double-conversion superheterodyne with a dual-loop tunable input circuit, quartz and ceramic filters, and a low-frequency noise limiter.
Completely new design of the case and the control panel of radio station provides the maximum convenience at operation. Particular attention is paid to saving the time of access to the controls of the radio station.
DISTINCTIVE FEATURES
240 channels on sub-bands A, B, C, D, E and F
Latest Black Matrix LCD with current mode display
12-segment signal level/strength indicator
Return to the previous channel when scanning
Memorization of 4 channels at the choice of the user
Built-in automatic noise reduction system
Parallel listening to two channels
SPECIFICATIONS
RF band |
A: 25615 - 26055 kHz; D: 26965 - 27405 kHz |
Number of channels |
240 in the "European" grid |
Types of modulation |
Frequency (FM) and amplitude (AM) |
Antenna impedance |
|
Control |
Volume control with power switch, noise reduction control, channel tuning (up/down), multi-segment level meter, switches: NB, DW, CH9, SCAN AM/FM, memory 1, 2, 3 and 4. |
Speaker |
Square 78 mm; 8 ohm; 3.0 W |
Microphone |
dynamic microphone |
Supply voltage |
|
Dimensions |
159 x 138 x 48mm |
To improve reliability, the radio control system uses contactless switching on diodes and transistors. There is a built-in filter in the power circuit to eliminate the influence of interference from the car's ignition system.
RECEIVER
Sensitivity at 10 dB S/N |
0.8 μV (AM); 0.5 µV (FM) |
Selectivity |
60 dB at 5 kHz bandwidth |
AGC range |
|
Squelch range |
0.5 µV - 1000 µV |
Output sound power |
1.0W into 8 ohms at 10% distortion |
Distortion at 1000 µV input signal |
no more than 3% |
Audio frequency range |
400 - 2400 Hz |
Intermediate frequencies |
1st - 10695 kHz |
Selectivity for side channels of reception is not less than 45 dB
TRANSMITTER
Radiated power level |
|
Frequency stability |
no worse than 0.005% |
Spurious level |
no more than - 70 dB |
Current consumption |
no more than 2.0 A |
Modulation parameters |
|
Frequency deviation when working with FM |
APPOINTMENT OF GOVERNING BODIES
Rice. 1. View of the control panel.
Regulator SQUELCH - "Squelch". This knob is used to adjust the level of the noise threshold when no signal is being received. To achieve the maximum sensitivity of the receiver, this control must be set to a position at which own or terrestrial noise is just beginning to be suppressed. Turn the control clockwise until the noise in the speaker disappears. The received signal should be just above the squelch threshold level. Turning the knob further clockwise increases the squelch threshold for the signal that can be heard. When the knob is in the extreme right position, only very strong signals can be received.
Be careful when adjusting, as a careless setting of the squelch level can significantly degrade the sensitivity of the receiver, making it impossible to receive weak signals.
ON/OFF/VOLUME - "Power On/Off, Volume Control". Turn the knob clockwise to turn on the power and set the desired volume level.
L.C.R button - "Return to the Previous Channel". If the radio is scanning and stopped on a channel, and you need to return to the previous channel on which the signal was detected during scanning, then pressing the button "L.C.R." scan mode will stop and the radio will go to the previous channel. The previous channel number will be shown on the LCD panel.
ASQ - "Automatic Noise Reduction". Pressing this button activates the auto noise canceling function. During this function, the display shows "AQ" and manual noise reduction mode using the SQ knob do not work. To disable this feature, press this button again.
SCAN button - "Scanning". When you press this button, the radio station receiver automatically scans (tunes through channels) until it tunes in to a busy channel. In this case, if the button is not pressed again within 5 seconds, then scanning continues until the next busy channel. The mode is accompanied by an indication of the sign "SC" on the LCD display panel.
AM/FM switch - "AM/FM". Select the type of modulation AM or FM. AM is used for short to medium range communications for the most natural sound. FM provides high-quality sound and information exchange at any range, including a large one, when the received signal is strong enough and reception is possible. But, above all, the modulation of your radio station must match the modulation of your correspondent's radio station.
Switch DW (Dual Watch) - "Parallel Listening to Two Channels". This feature is equivalent to having two receivers in one radio. In this mode, you can listen to two different, preset channels. Determine the channels you want to listen to (for example: 10th and 20th). After tuning to the 10th channel, press the switch "DW". A flashing sign will appear on the LCD display "DW". Then tune in to channel 20 and, having set the desired noise reduction level, press the button "DW" secondarily. Now the radio station will tune in to the 10th and 20th channels alternately with an interval of 0.5 seconds. If necessary, you can contact the subscriber on one of the two selected channels, and after the end of the connection, the radio will again switch to the parallel listening mode for the 10th and 20th channels. To disable this mode, press the button again. "DW".
Four buttons 1, 2, 3, 4 (Memories) - "Memory of 4 Channels". The radio has a memory function for any four channels. To memorize a specific channel selected by the tuning knob, press and hold for up to 3 seconds. one of the four buttons. The channel will be stored in the memory cell under the number of this button. If you need to call this channel, just press the button with this number and the indication of its number will appear on the left side of the LCD display panel.
Button CH9 - "Channel 9". The factory setting is to enable the emergency channel. To enter an emergency, just press the button "CH9". Multigrid mode 240 CH. To configure the radio station in multi-grid mode, you must turn on the station using the knob "VOLUME" while simultaneously pressing the buttons "DW" and "CH9". Button "CH9" now used to switch grids - A, B, C, D, E and F. To switch the station to single-grid mode, turn off the station and turn it on again while simultaneously pressing the buttons "DW" and "CH9"(the station automatically switches to single-grid mode after the voltage is removed from the power connector).
Switch CH (CHANNEL) - "Channel Switch". This is a reversible knob with which you can tune to the selected channel.
BEP- When this button is pressed, the display shows "VR". This means that pressing any function key will be accompanied by a beep. To disable this feature, press this button again.
Button FRQ (Frequency/Channel) - "Channel Frequency/Channel Number". By successively pressing this button, the LCD display panel will display the channel frequency or channel number, respectively.
Scoreboard SRF - LCD Display. Information board for monitoring the status and modes of operation of the radio station.
U.P.- By pressing this button on the headset, you can switch to the next channel instead of using for this purpose CH switch.
DN- By pressing this button you can switch to the previous channel instead of using for this purpose CH switch.
AQ - "ASQ on the mic". For convenience, you can enable (disable) the automatic noise reduction function from the microphone.
MULTI-FUNCTION LCD DISPLAY
The design of the radio station uses the latest multifunctional liquid crystal display (LCD) of the Black Matrix type with storing the current mode and with additional backlighting.
Particularly convenient when using the LCD display are the 16 mm channel number indicator digits.
The information panel of the LCD displays the main functional parameters of the operating modes of the CB radio station. Assignments of mnemonic characters displayed on the display panel are shown in Fig.1.
1, 2, 3, 4 - The numbers of memory cells in which four pre-selected channels are stored.
AM FM - AM / FM. The indication of one of these signs means the choice of the type of modulation AM or FM.
SC (Scan) - Scanning. Sign indication "SC" means the receiver is in auto scan mode.
To use this function, turn on the power of the radio and set the desired volume. Adjust noise reduction. Click the button "SCAN" and the scan will start. The symbol will appear on the LCD. "SC". When a channel is detected with a signal that exceeds the squelch level, scanning stops for 5 seconds. and resumes again until you press the PTT or button "SCAN".
DW (Dual Watch) - Parallel Listening to Two Channels. Sign indication "DW" means the inclusion in the radio station of the functional mode of parallel listening to two channels.
If the radio station scan is paused on a specific channel that is occupied by the desired correspondent, press the PTT to start the session. This stops scanning and the radio switches to transmit mode.
NB (Noise Blanking) - Noise compensation. Sign indication "NB" means the inclusion of a compensation system for amplitude periodic low-frequency impulse noise when receiving in AM mode (in FM mode, the operation of the compensation system is indistinguishable).
LOC (Local) - Local Communication Mode. Sign indication "LOC" means that the RF amplification provides communication in the local mode.
"40d" / "27.40 5 " - Indication of Channel Number / Frequency. The 5-digit digital indicator in the central part of the LCD displays the number of the selected channel or its frequency.
SRF (S / RF - meter) - Level Indicator. A 12-segment meter shows relative received signal levels or transmitter output power.
INSTALLING THE RADIO IN THE CAR
The radio is designed for use in vehicles with a 12-volt battery and a grounded minus.
Before installing the radio, check that your vehicle meets this requirement.
A mounting bracket and a microphone holder are designed to mount the radio in a car.
WHERE TO INSTALL THE CB RADIO?
The radio station is installed in the car in such a place that its use does not create inconvenience and does not distract the driver from driving. The best place for this purpose is under the dashboard of the car.
Attention: Make sure that when choosing a location for the installation of the radio station, it does not interfere with the driver and does not impair access to the vehicle controls. Observe the safety requirements when laying connecting cables. If the radio or connecting cables are in an awkward position, you may lose control of your vehicle.
MECHANICAL INSTALLATION
Step 1. Being careful, use the mounting bracket as a template to mark the mounting holes under the dashboard. To mark the drilling locations, use an awl or other sharp tool designed for marking on metal.
Step 2: Drill two 3mm holes for each mounting plate mounting screw. Fasten the bracket under the dashboard with the supplied 10mm self-tapping screws (see fig.2). Be especially careful when drilling holes so as not to damage the wiring harnesses and electronic devices located under the panel.
Fig.2. Mounting the radio with a mounting bracket.
RADIO INSTALLATION
Step 1: Slide the radio into the mounting bracket until it aligns with the tabs (See Figure 3). Set the optimal angle of the radio body for easy access.
Step 2: Attach the radio's latches, making sure there is room for connecting external cables to the back of the radio.
Rice. 3. Mounting the radio station with clamps.
INSTALLING THE MICROPHONE HOLDERDrill two holes near the radio on the dashboard of the car to install the microphone bracket (see Fig. 4). Secure the holder with two 10mm self-tapping screws from the kit to the radio. |
|
CONNECTING AN EXTERNAL SPEAKER (not included)On the rear wall of the radio station there is a socket for connecting an external speaker "EXT. SP" (see Fig. 5). Insert the plug from the external speaker into it. This disables the built-in speaker. |
CONNECTING THE POWER
Since the MegaJet MJ-3031M radio station is equipped with a power filter to eliminate interference from the engine ignition system, it can be connected to the car's on-board network at any point. To reduce interference, it is better to use a wire in the form of a twisted pair.
Step 1: Disconnect the power cables from the battery terminals to prevent short circuits that may occur when powering up the radio.
Step 2: Securely connect the black "negative" wire from the radio directly to the vehicle body. For best performance, your radio requires good metal-to-body contact.
Step 3. Connect the red "positive" wire from the radio with built-in fuse holder to the fuse box ("cigarette lighter" or directly to the positive battery terminal). The fuse block is usually the most convenient point for connecting the radio. You can connect the power cable to the ignition switch contacts, in which case the radio will turn off automatically when the ignition is turned off, which will prevent accidental battery discharge.
Step 4: Reconnect the power cables to the battery terminals. Connect the plug of the power cord to the power socket on the back of the radio.
INSTALLATION AND SETUP OF THE VEHICLE ANTENNA
In the CB band, antennas with vertical polarization are most widely used. This is due to the fact that it is difficult to place an effective antenna with horizontal polarization on a car, and CBS communication is mainly used for mobile objects. For the same reasons, antennas with a circular radiation pattern of the "GP" (Ground Plane) type are used.
In general, there are two types of antennas for mobile CB radios - a full-size 1/4-wave whip (2.75 m) and a shortened matched whip antenna (from 0.5 to 1.9 m). Due to the large length of full-size antennas on vehicles, mainly shortened antennas with a length of at least 1.2 m are used, in various designs with mounting through a hole in the roof, on a bracket for a drain flanging or on a magnetic base (see Fig. 6 ).
Rice. 6. Typical installation locations for car antennas.
Magnetic base antennas have the advantage of being easy to stow inside the car when parked, and the strength of the magnet keeps the car secure when shaking and driving at high speeds.
The antenna pattern depends on the location of the antenna. When installing the antenna in the middle of the roof, the radiation pattern approaches circular. If the antenna is installed on the right edge of the roof, then its maximum gain will be directed to the left of the vehicle axis. When placing the antenna on the rear trunk, its diagram will be directed forward.
Here are some basic rules to consider when choosing an antenna installation location:
Install the antenna at the highest point of the car.
The more of the antenna above the roof, the better.
Install the antenna in the center of the surface that is selected for installation.
Lay the antenna cable as far as possible from sources of interference such as ignition wires, electromagnetic devices, etc.
Be sure to securely connect the shield of the lead cable to the metal of the body at the point where the antenna is located.
If the antenna is equipped with a standard cable, it is unacceptable to change its length.
Be careful not to damage the cable.
On fig. 6 shows five typical installation locations car antenna: (1) rear bumper, (2) back cover trunk, (3) flanging for water drainage, (4) hood, (5) roof.
For qualified advice on choosing the type of antenna and its installation location, contact your sales company.
ANTENNA INSTALLATION
Carefully follow the antenna manufacturer's installation instructions.
Attention! Never turn on the radio with the antenna disconnected or with a damaged antenna cable. The result may be the failure of the radio station.
CAR ANTENNA SETUP
The installed car antenna must be tuned to resonance at the middle frequency of the range. For tuning and periodic monitoring of the antenna and antenna cable, SWR meter, which is connected in a chain between the radio station and the antenna cable using a separate adapter cable of the minimum length. Different types of antennas are configured in different ways, so you need to read the instructions. As a rule, tuning an antenna that has a reliable galvanic (or capacitive - through the entire area of the magnet) contact with a conductive underlying surface (area) at the antenna location point is carried out by reducing or increasing the length of the pin. Try to achieve a minimum SWR (one ideally) in the middle of your chosen frequency section (for example, between the two most frequently used channels). And if at the same time at the edges of the "working" range you can get an SWR of no more than 1.5, then your choice of channels is correct and the antenna is tuned perfectly.
THINGS TO REMEMBER WHEN USING A VEHICLE ANTENNA
Attention, possible consequences! Never turn on the radio station for transmission, even for a short time, with an untuned antenna or an "out of tune" antenna, when the reliable electrical contact of the cable sheath and the "mass" of the antenna with the conductive underlying surface at the antenna location is lost (SWR more than 2.5). In such a situation, an unpredictable spatial redistribution of the near electromagnetic field lines of force occurs on the outer surface of the antenna cable sheath and all electrically conductive surfaces of the body, and, most unpleasantly, high-frequency surface currents of considerable magnitude occur inside the car interior. You are no longer received even by closely spaced correspondents, and the tangent slightly burns the palm. The level of these high-frequency voltages is especially significant on the so-called "hubs" - spatial conductors whose electrical length (physical length divided by the shortening factor) is close to or a multiple of a quarter of the wavelength. Such apparent "hubs" are loosely hanging wiring harnesses under the dash, connected cords from cell phone chargers, and a coiled cord from the radio's PTT. Through these conductors, high-frequency currents in an unforeseen way affect the elements of the electrical circuit of the devices and the radio station itself from the inside and can cause irreversible damage. The most sensitive to such effects are (in descending order) the central microprocessor of the radio station (irreversible damage), the windshield wiper unit (short-term malfunction), the memory chips of car radios and, rarely, cell phones (irreversible damage), the engine control system (short-term malfunction ). We note, however, that such failures and damages during the inadmissible operation of the radio station on an uncoordinated load ("detuned" antenna), according to statistics, occurred mainly only in cases of using additional high-power equipment. (For those who assume or already operate such "auxiliary" equipment, we inform you that even with a fully serviceable and tuned antenna, but if the negative power wire of this equipment is broken or if the cross-sectional area of \u200b\u200bthis wire is insufficient, there is also an off-design redistribution of power lines of the near electromagnetic field with consequences).
Another dangerous factor in the event of a violation of the integrity of the contact of the "mass" of the antenna with the underlying surface and the cable sheath, which often leads to a malfunction and / or irreversible damage to the microprocessor of your radio station (even if it is turned off), is the static potential difference that occurs in this case between car body and a long antenna pin. In addition to the deterioration of the communication range, rustles and crackles are observed in the dynamics of the radio station when the car is moving. Static stress occurs due to friction against the air flow and the road surface. At the same time, there is different humidity at the levels of the road surface, wheels, body and antenna pin. As a result, a significant difference in static potentials can form between the antenna pin and the body, followed by the occurrence of a spark discharge in the antenna pin - radio station - car body circuit.
Thus, at the first detection of signs of deterioration in the quality of the antenna, you must immediately check the integrity of all connections and contacts or contact a specialist.
It should be noted that periodic inspections with SWR control and minimal routine care for the quality of connections, especially during periods of changing seasons, will completely protect a careful driver from unpleasant "non-warranty" situations and unnecessary costs.
TERMS OF USE OF THE RADIO STATION
Turn on the radio by turning the "On/Off and Volume Control" knob clockwise. Set the desired sound volume.
Adjust the noise reduction threshold with the "Squelch" regulator in accordance with the instructions in paragraph 3.1 of this manual.
Select the desired channel using the channel selector (p. 3.11).
Note: If the channels are not being tuned, please note that the memory recall mode may be enabled. In this case, turn off the "Channel 9" emergency button.
TRANSMISSION MODE
Press and hold the PTT switch on the microphone body. Hold the microphone body at a distance of 5 cm from your mouth and speak in a normal intelligible voice.
RECEPTION MODE
Just release the PTT and listen to your correspondent using the volume and squelch controls to achieve the best sound quality.
radio stationMegaJetMJ-3031 MTurbo can safely be called one among the users of CB (CB) communications. Megajet radio stations are actively used by radio amateurs and motorists to organize the exchange of information among themselves over long distances.
Station MegaJetMJ-3031 MTurbo(Megajet 3031 Em Turbo) is equipped with good functionality and attractive design, simple and convenient operation. Modification with a prefix Turbo entered the market in 2009, and the predecessor produced since the mid-90s MegaJetMJ-3031 M was the first station model with an automatic noise suppressor. From old version MJ-3031M Turbo is different increased power of the output stage of the transmitter, the presence of processor switching 0/5 (European / Russian frequency standard), the number of channels increased to 320, the presence of the Roger Beep function (a signal at the end of the transmission), the Local mode (a stepwise decrease in the sensitivity of the receiver for communicating with correspondents at a close distance) and some other features that will be discussed below.
Photo Radio station MegaJet MJ-3031 M TURBO
Station MJ-3031 M Turbo is made in the form of a classic monoblock. The top and bottom covers are metal, connected to the body with screws. The speaker is located on the bottom, information with the serial number of the station is also printed here. On the back wall are: an enlarged cooling radiator - this is another difference between the Turbo versions; a standard SO-239 antenna connector, a 3.5 mm jack for connecting an external speaker, as well as power wires. The front panel is factory installed in both black and mahogany look.
The walkie-talkie is equipped with a large LED display, the characters of which are well read under various angles and lighting conditions. It displays: channel number or frequency, transmitter power level and receiver signals, modulation types, memory registers, scan modes and other useful functions. The display color is black, and the backlight can be selected yellow or red.
The control panel has three controls, function buttons, and a microphone jack. variable potentiometer VOL, is responsible for turning on (off) the station and adjusting the volume of the speaker. Another - CH is used to switch channels. By using SQ You can control the operation of the spectral noise suppressor. The PTT connector securely fastens the microphone with a threaded connection, it has six pins (6-pin). Buttons for activating various functions are highlighted and have the following purpose:
M1, M2 and M3- are responsible for managing memory cells;
FR switches the display on the display to either the channel number and the grid, or the frequency;
A/ F– switching the modulation mode AM/FM;
SC– switching on the scanning mode by channels;
DW– double tracking (listening to 2 channels);
CH 9- button for quick transition to emergency channel 9;
ASQ/ COL– enable or disable the automatic noise suppressor, as well as change the color of the backlight (long press);
EN/ LOC- fast switching 0/5, or decrease in the sensitivity of the receiver (long press);
BP/ R.B.– enabling/disabling sound accompaniment of pressing keys or tonal confirmation of the end of transmission RogerBeep (long press);
MUT/ T.O.T.– mute, limit transmission time (long press).
Compact in size, quite light and fits comfortably in the hand. For the driver especially important on the move have at hand the ability to quickly switch the main parameters of the station. The manipulator has a large transmitter power button, UP / DN channel switching buttons and an AQ automatic squelch control button. The microphone is of the electret type.
Specifications MegaJet MJ-3031MTURBO
Trademark | MegaJet |
Frequency range, MHz | 26960 ~ 27400 |
Number of frequency channels | 40/320 Export |
output power | 4 W |
Sensitivity, μV (s / w) | AM: 0.5uV (S/N l0dB) FM: 0.5uV (S/N 20dB) |
Frequency grid step, kHz | 10 |
Squelch type | Automatic ASQ, adjustable SQ (spectral) |
Maximum consumption current, mA | 2500 |
Antenna connector type | UHF-female (PL 259-female) |
Operating temperature range, °С | -10 +50 |
type of instalation | on mounting bracket |
Dimensions, mm | 159 x 138 x 48mm |
Weight, gr. | 870 |
Developer country | Korea |
Type of | automotive |
Advantages of the radio stationMegaJet MJ-3031MTURBO
- excellent modulation quality;
— high-contrast BlackMatrix display;
- powerful output transistors with a large heatsink;
- the most accurate phase adjustment of the frequency;
— non-volatile memory;
— two types of scanning by channels;
— three-tone beeper;
— quick-detachable design on the connector;
— intuitive control;
— high-quality assembly;
MegaJet MJ-3031 M TURBO Radio Disclosure:
Enabling 320 channel operation and setting the working grid .
Turn off the radio with the controller VOL/ON, then press the button A/F and, without releasing it, turn on the station. Symbols should appear next to the channel number "U" and frequency grid letter A, B, C, D, E, F, G, H. select the working grid using the key CH9. For reference: most users work on the gridD.
Factory reset .
If the station does not work correctly or you need to clear the channel memory cells and return to the factory settings, you must turn on the radio station with the knob VOL/ON while holding down the button CH9 until the display shows “ rSEt”.
Outcome
Radio stations , MJ-400, MJ-600 Plus (Turbo) and MJ-3031M Turbo for channel 15 with AM modulation do not fit well! This is not to say that they cannot be used at all. In principle, it is possible, on a calm air, provided that there is no interference, no strong noise, no long-distance transmissions and a small number of correspondents simultaneously working in the channel. To fulfill these conditions in modern realities is extremely difficult, and almost impossible. All these radio stations, besides being obsolete, are ill-suited for the tasks for which they want to be used. No modifications can fix the automatic squelch so that it works correctly in channel 15 in AM, this is contrary to the principle of its operation. If you need a walkie-talkie capable of working well in channel 15 with amplitude modulation, take a closer look at radio stations that have threshold squelch. And it is even better that there are 2 of them, threshold and automatic.