Description and Overview
MegaJet MJ-300T- continuation of the once popular model with increased transmitter power. FREE work check upon purchase and FREE setup when purchased with an antenna.
Description of the radio station:
1. Appearance of the radio station
The car radio station MegaJet MJ-300 Turbo differs from the previous model MJ-300 by increased transmitter power AM-8 W, FM-16 W). The MJ-300 Turbo has compact dimensions (138x40x125) and a small weight - 1 kg in assembly. Controls are conveniently placed on the front panel, thanks to which you can set the megajet MJ300 turbo autoradio station for the optimal mode of operation. Thanks to the bright and comfortable backlighting of the front panel, as well as the LCD display, which displays the channel number and the RX / TX signal level indicator, it is convenient to work with the MegaJet MJ-300 Turbo CB-band radio station even in the dark.
The stamping quality of the plastic parts is very good. The front panel is simple, has a minimum of buttons and knobs, a small indicator, but the MegaJet MJ-300 Turbo radio has some differences appearance from MegaJet MJ-100. The radio station is made on the technological platform "600" (modern multifunctional radio stations MJ-600 and MJ-600plus are produced on this platform). The longitudinal size of the case is only 125 mm, which allows you to place the radio station in a limited space of any car dashboard. The radio station's PTT is equipped with high-quality electret microphone, a powerful 3 W speaker is responsible for the sound quality and it is possible to connect an external loudspeaker.
2. EquipmentMegajet MJ-300 Turbo
- transceiver
- PTT with microphone
- Power cable with fuse
- Mounting bracket
- User guide
3. The main declared functions.
- 135 frequency channels including "holes"
- Ability to work in the Russian frequency grid (shift -5 kHz)
- Built-in input attenuator
- Channel indication
- RX/TX signal level indicator
- Adjustable spectral noise gate
- Scan Mode
- Emergency tuning to channel 9
Overview of the radio station Megajet MJ-300 Turbo
The Megajet MJ-300 Turbo has been designed taking into account the climatic conditions of operation in central Russia, which guarantees a long service life and stable operation. MEGAJET MJ300 Turbo has a good receiver sensitivity due to modern circuitry, and this is achieved by using a separate frequency synthesizer mounted on an LC7152N chip with external digital control. This made it possible to expand frequency range, improved the spectral purity of the signal and improved the stability of the operating parameters.
The design of the Megajet 300 Turbo radio station uses a Black Matrix liquid crystal display (LCD) with current mode memory and additional backlight. Particularly useful when using the LCD display are the 10 mm channel number indicator digits, black digits on an amber background. The information panel of the LCD displays the main functional parameters of the operating modes of the CB radio station.
MegaJet MJ-300 Turbo assembled on the basis of SAMSUNG processor 3P9228AZZ-QZR8 and uses frequency (FM) and amplitude (AM) modulation. The station is capable of operating on 135 channels in the Russian and European frequency grids and has a transmitter power of up to 8/16 W (AM/FM). The transceiver has a channel scan mode and the possibility of emergency tuning to the 9th channel. Megajet 300 Turbo has a compact size and an informative high-contrast backlit LCD display. In addition, it is worth noting the built-in attenuator of the input signal, the ability to work in "holes" and the non-volatile memory of settings.
Megadzhet МЖ-300 Turbo CB radio station combines excellent functionality, good transmitter power and low price. You can safely call this model the best choice for out-of-town weekend trips. Compact size, low power consumption and ease of use combined with a magnetic base antenna* makes this model good choice for all. The Megajet 300 Turbo radio is better adapted to the conditions of a big city, where there is a high level of interference and a large number of stations.
ATTENTION! It is forbidden to use the radio station without an antenna connected to it!
Among a wide selection of antennas, you can buy the one you need in RADIOSILA stores!
Radio station MEGAJET МЖ-300 TURBOcan be purchased from our departments in Moscow , St. Petersburg , Yekaterinburg , Tyumen , Perm, Chelyabinsk, Ufa, Samara or order delivery to any location in Russia: Kazan,Novosibirsk , Nizhny Novgorod , Omsk , Rostov-on-Don , Volgograd , Krasnoyarsk , Saratov , Voronezh , Krasnodar , Izhevsk , Ulyanovsk , Barnaul , Irkutsk , Novokuznetsk , Orenburg , Kemerovo and other cities.
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| Transmitter power (AM/FM) | 12/20 W | |
| Warranty | 6 months | |
| Operating temperature range | -20"С +55"С |
|
| Current consumption, maximum |
2 A | |
| Squelch type | Spectral | |
| Antenna connector |
SO 239 | |
| Power cable length | 1.1 m | |
| FREQUENCIES | ||
| Working range | CB 27 MHz | |
| Number of channels | 120 |
|
| Modulation |
frequency (FM) and amplitude (AM) |
|
| Number of subcodes (analogue) | No | |
| Communication channel selection | manual | |
| OPERATING MODE | ||
| Push-to-talk PTT mode | Yes | |
| Voice activation | Not | |
| Busy Channel Scan | Yes | |
| FUNCTIONS | ||
| Tone call |
Not | |
| Automatic squelch |
Yes | |
| Noise reduction adjustment |
Yes | |
| Keyboard lock |
Not |
|
| Turn off noise reduction | Yes |
|
| Sound. key press signal |
Not |
|
| Volume control |
Yes |
|
| DISPLAY | ||
| Display | Yes | |
| Display type | LCD | |
| Display backlight | Yes | |
| INDICATION | ||
| Operating mode indication | Yes | |
| Power on indication | Yes | |
| Ind. selected channel | Yes | |
| Ind. signal transmission | Yes | |
| Ind. signal reception | Yes | |
| POWER SUPPLY | ||
| Mains powered | 12V (13.8V) | |
| Antenna type | External | |
| INTERFACES | ||
| Headset Jack | standard 4 pin |
|
| Programming |
Not | |
| RECEIVER | ||
| Sensitivity |
0.3 μV s/n 12 dB FM/0.5 μV s/n 10 dB AM. |
|
| Noise reduction adjustable with max. threshold |
1 mV |
|
| Frequency response |
300 - 3000 Hz +/- 3 dB |
|
| Built-in loudspeaker |
6 ohm |
|
| Intermediate frequency 1 IF: |
10.695 MHz, II IF: 455 kHz |
|
| Nonlinear distortion |
at 1 kHz 5% |
|
| TRANSMITTER |
||
| Output power in AM mode |
Up to 12W |
|
| Output power in FM mode |
Up to 20 W | |
| Spurious suppression |
within the normal range |
|
| output impedance |
50 ohm |
|
| EQUIPMENT | ||
| Radio stations included | 1 | |
| Antenna |
not included | |
| COLOR / DIMENSIONS / WEIGHT | ||
| Color | the black | |
| Dimensions (H*W*D) | 40x125x138mm | |
| Weight | 690 | |
|
The country Manufacturer |
Korea MegaJet |
|
Compact and inexpensive car radio CB range. This is the simplest, budget model in the line of radios made on the basis of the megajet 600 platform.
The features of both this model and the entire line include: a frequency synthesizer on a Motorola LC7152N chip (characterized by high stability, accuracy and purity of the formed subcarriers) and a SAMSUNG 3P9228AZZ-QZR8 digital control microprocessor. As a result - more stable and high-quality communication in conditions of high industrial interference.
This station is distinguished from other models assembled on the basis of the "platform 600" by low output power, a small LCD screen and compact dimensions - quite typical features of a budget solution. The radio can be recommended as an inexpensive and reliable solution for a taxi or delivery service with a short range
There is a version of the Megajet MJ-300 Turbo transceiver, which is distinguished by an increased transmitter output power up to 18 W and the presence of an automatic spectral noise suppressor.
Megajet 300 radio stations are manufactured by several enterprises in Southeast Asia. The main external difference between walkie-talkies made in China is the blue backlight of the display.
Instruction for MEGAJET MJ-300 (in Russian).
MEGAJET MJ-300 FEATURES:
- Compact design
- Mode indication TX / SC / FM / AM / L / H
- Speaker with increased power up to 3 W (size 76x76 mm)
- Adjustable automatic squelch
- Scan mode (SCAN)
- Emergency tuning to emergency channel 9
- Ability to connect an external speaker
- AM / FM mode switching
- Button control of Up/Dn channels
- Channel display, grid, scan
- Connector for external speaker jack 3.5mm
TECHNICAL SPECIFICATIONS MEGAJET MJ-300 |
|
| frequency range | 26.965 - 27.405 MHz (AM) 26.965 - 27.855 MHz (FM) |
| Number of channels | 120 (3 grids - B,C,E) |
| Supply voltage | 13.6 V |
| Dimensions (WxDxH) | 138x125x40mm |
| Weight | 600 g |
TRANSMITTER |
|
| output power | 4 W 18W (Turbo) |
| Modulation type | AM (level > 90%) FM (deviation 1.5 kHz) |
| Frequency stability | 0.0005% (5ppm) |
| Consumption in transmission mode | up to 0.9 A |
RECEIVER |
|
| Type | Superheterodyne with two IFs (first - 10.695 MHz, second - 455 kHz) |
| Sensitivity | 0.3 μV (FM, signal-to-noise ratio 12 dB) 0.5 µV (AM, signal-to-noise ratio 10 dB) |
| Signal to noise ratio | >45 dB |
| Squelch Threshold | 0.5µV |
| LF output power | |
Production - Republic of Korea (RKK company). Certified in Russia, 6 months warranty.
Equipment: radio station MEGAJET MJ-300, PTT with microphone, power cable, mounting bracket, instructions.
Mode - "45 channels": press and hold the A / F button for a couple of seconds - the screen will display the inscription SP and the radio will switch to 45 channel mode, when pressed / held again, it will switch back to 40 channel mode, the screen will display SF.
Switching Russian / European frequency grid in MEGAJET MJ-300: While holding down the A/F and CH9 buttons, turn on the radio with the VOL/OFF knob. The symbol "5" will be displayed on the screen. To return to normal mode, you must repeat the specified operation.
Turning on the attenuator: press and hold the CH9 button for 2-3 seconds, the screen will display the characters "Lo". If you press and hold the CH9 button again, this mode is turned off, and the symbols "L" will be displayed on the screen. An attenuator is used to dampen the received signal to improve speech intelligibility.
On this page you can find antennas for MegaJet walkie-talkies that operate in the 27 MHz band, which is allowed for civil communication and does not require a license. These are the ones used by the vast majority of truckers, taxi drivers and travelers.
It is hardly possible to call any antenna the best for the Megajet radio station: they are all made under different models and different conditions. Here are some examples of such differences:
- MegaJet CB 50 MAG-125. This antenna is attached to the surface of the car with a magnet with a diameter of 12.5 cm. It is convenient to adjust the SWR on it. Continuous input power - 20 W, bandwidth - 700 MHz;
- but the MegaJet OMEGA model is installed in the car using a bracket. It allows you to work with 120 channels and has a maximum continuous power of 15 watts;
- MegaJet T3-27-N MAG-90, on the contrary, is mounted on the machine using a hole in the body. This antenna supports 650 channels and provides continuous output power 20 W.
Such differences are important for users, so please consult our specialist before purchasing the most correct model for yourself. We will help you to buy just such an antenna for the Megajet walkie-talkie that you need. Call!
Introduction
1. Brief specifications and distinctive features
2. Main features and functions
3. Controls and display
4. Basic modes
5. Small LCD display
6. Installing the radio station in the car
7. Installing and configuring a car antenna
8. Rules for using the radio station
INTRODUCTION
Thank you for purchasing car radio MegaJet MJ-300. The MegaJet MJ-300 radio station is easy to use and will provide you with safe, efficient and reliable communication. Please read carefully this manual before use. The information provided here will help you get the best performance out of your radio.
The Megajet MJ-300 radio station belongs to the class of equipment available for civilian radio communications in the range.
1. SAFETY INFORMATION
The following precautions must be observed when operating, maintaining and repairing this device.
Repair and maintenance radios MegaJet The MJ-300 must be produced by qualified personnel in a specialized workshop.
Do not make any modifications to the radio!
Turn off the radio before entering an explosive or flammable area.
Do not use radios with a damaged antenna. If a damaged antenna touches parts of the body, there is a high chance of getting burned.
To avoid creating electromagnetic interference or compatibility problems, turn off the radio where required, especially where there are information signs to remind you to do so.
Turn off your radio before entering a blasting area.
For vehicles with airbags: Do not place the radio in the airbag deployment area or directly on top of the airbag covers.
Functionality of radio station MegaJet MJ-300
Compact design
Microprocessor SAMSUNG 3P9228AZZ-QZR8
Separate frequency synthesizer on the LC7152N chip
Front panel with small LCD display
Increased power speaker (8 ohm, 3 W, square 76x76 mm)
Robust PTT with electret microphone
Scan Mode(SCAN)
Emergency tuning to channel 9 (CH9)
Ability to connect an external speaker
1. BRIEF TECHNICAL CHARACTERISTICS OF RADIO MEGADJET 300
..2. MAIN FEATURES AND FUNCTIONS
FUNCTIONS
- Two kinds
- Scan button SC
- Channel 9 emergency call (toggle)
- Button control of UP/DN channels
- Non-volatile settings memory
- Adjustable automatic noise reduction system
- Built-in input attenuator
CONTROL
- Volume control with power switch
- Squelch Threshold Control
- Channel up/down buttons
- Channel 9 emergency call button
- Channel scan button
LCD DISPLAY
- Display CHANNELS/GRID/SCAN
- Mode indication TX / SC / / L / H
3. CONTROLS AND DISPLAYS
Description of controls
1. 4-pin connector for connecting a PTT (headset)
2. Power on / Volume control VOL / OFF.
3. Threshold level control ..
4.LCD display. All current radio operating modes are displayed.
5. Button for selecting the type of modulation AM / FM (AM / FM).
6. SC scan button. This button can be used to search for a channel with heavy traffic. After pressing this button, the channels are scanned up. When a signal is found, scanning will be paused. After stopping reception, scanning resumes after 10 seconds. Clicking on transmit will stop scanning.
7. Button to quickly switch to the emergency call channel CH9 / switch. This button is designed to quickly switch to the 9th channel in case of an emergency. If the radio is in multi-grid mode, this button switches grids. When pressed for a long time (more than 1 second), the built-in attenuator is turned on to attenuate the received signal. In this case, the symbols "Lo" will be displayed on the screen. When you hold the CH9 button again, the mode is turned off, and the symbols “Lf” will be displayed on the screen.
8. Up channel switch button
9. Channel down button DN
Description of connectors on the back of the radio
SC - Scan. The indication of the sign “SC” means that the receiver is in the automatic scanning mode. To use this function, turn on the power of the radio and set the desired volume. Adjust noise reduction. Press the "SC" button and scanning will start. “SC” will appear on the LCD. When a channel is detected, the signal in which exceeds the squelch level, scanning stops and resumes again after the signal disappears, up to pressing the PTT or the “SC” button.
M,L,H – in multi-grid mode, indicates grids C, B, D, respectively.
5 - indicates the inclusion of the frequency shift mode by -5 kHz (Russian standard)
6. INSTALLING THE RADIO IN THE CAR
The MegaJet MJ-300 radio is designed for use in vehicles with a 12-volt battery and a grounded minus. should be sufficient both to power the radio station, and for the needs of automotive electricians.
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.
INSTALLATION LOCATION OF CB RADIO STATION
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 WORK DURING 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. Secure the bracket under the dashboard with the provided self-tapping screws (See Fig. 1). Be especially careful when drilling holes so as not to damage the connecting harnesses and electronic devices located under the panel.
Fig.1. Mounting the radio with a mounting bracket.
RADIO INSTALLATION.
Step 1. Insert the radio into the mounting bracket until it aligns with the tabs (see Figure 2). 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. 2. Mounting the radio station with clamps.
INSTALLING THE MICROPHONE HOLDER.
Drill two holes near the radio on the car dashboard to install the microphone bracket. 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". Insert the plug from the external speaker into it. The built-in speaker is turned off.
POWER CONNECTION.
Since the MegaJet MJ-300 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 power cord plug to the radio cable connector.
7. INSTALLATION AND SETUP OF THE VEHICLE ANTENNA
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, vehicles are mainly used shortened antennas 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. 3).
Rice. 3. 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 firmly in place 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.
On fig. Figure 3 shows five typical installation locations for a car antenna: (1) rear bumper, (2) rear trunk lid, (3) water runoff, (4) hood, (5) roof.
For qualified advice on choosing the type of antenna and its installation location, contact your sales company.
Installed car antenna should be tuned to resonance at the mid frequency. To tune and periodically monitor the antenna and antenna cable, a meter is used, which is connected to the circuit between the radio station and the antenna cable using a separate cable adapter of 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 (the area of the roof of the cabin) at the 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 it is possible to obtain an SWR of no more than 1.5, then your choice of channels is correct and the antenna is tuned perfectly.
Carefully follow the antenna manufacturer's installation instructions.
Attention! 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. This can lead to damage to the radio and electrical equipment of your car!
8. TERMS OF USE OF THE RADIO STATION
- Turn on the radio by turning the “VOL/OFF” knob clockwise. Set the desired sound volume.
- Adjust the squelch threshold with the “SQ” control as instructed in this manual.
- Select the desired channel using the UP/DN channel buttons.
Note: If channel hopping is not performed, please note that emergency channel mode may be enabled. This mode is deactivated by pressing the emergency button CH9 “Channel 9”.
TRANSFER 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.
RECEIVE MODE.
Just release the PTT and listen to your correspondent, using the volume and squelch controls to achieve the best sound quality.
