Many novice users of car radios do not know how the grids of SI-B radios are switched, so in this article we will describe methods for some well-known radio stations.
Megajet MJ-50
Grid switching is carried out by the "EMG" button . Central grid "C".
Megajet MJ-100/200/200+
While holding down the A / F button, turn on the radio with the VOL / OFF knob. The screen will display "M" to the right of the channel number. Switching between grids is done by pressing the CH9 button.
After switching on again, P\C remains in multi-grid mode.
Central grid - M
Megajet MJ-150
By holding down the 9/19 button for at least 3 seconds.
Central mesh - C
Megajet MJ-300 new (NVRAM):
To switch from 40-channel to 120-channel mode, turn off the radio station with the VR knob, press the A/F button without releasing it, and turn on the station.
To switch grids, use the CH9 button.
The central grid is indicated by the symbol "M", when the upper grid is turned on, the symbol "H" appears on the display, when the lower grid is turned on, the symbol "L"
Megajet MJ-300 old (volatile memory)
To switch from 40-channel to 120-channel mode, turn off the radio station with the VR knob, press the A / F and SC buttons, without releasing it, turn on the station.
To switch grids, use the CH9 button. The central grid is not indicated in any way, when the upper grid is turned on, the symbol “H” appears on the display, when the lower grid is turned on, the symbol “L” appears
Megajet MJ-333/350
While holding down the A / F button, turn on the radio with the VOL / OFF knob. To switch grids, use the CH9 button.
Central mesh - D
MegaJet MJ-400 / YOSAN JC-2204
Press the A / F button and, without releasing it, turn on the station. When turned on
In 240-channel mode, a symbol from “A” to “F” will appear next to the channel number, showing the working grid. To switch grids, use the CH9 / M3 button.
Central mesh - D
MegaJet MJ-500/550/555/555K
Grid switching is carried out by the button "9 / SHT PRI" . Central grid "C".
Megajet MJ-450/ 450T/ 650/ 650T/850
While holding down the A / F (AM / FM for 850), turn on the radio with the VOL / OFF knob. To switch grids, use the CH9 button.
Central mesh - D
Megajet MJ-600 Turbo. (Old)
With AM/FM and SCAN pressed, turn on the station with the knob.
Central Grid - D
Megajet MJ-600 Plus (Old)
While holding down the two buttons "FC" and "ASQ" turn on the radio with the VOL / OFF knob. Grid switching is performed by the CH9 button.
Central Grid - D
Megajet MJ-600/ MJ-600 Plus/600 T/600+ T
GRID SWITCHING TO 240 CHANNELS
While holding down the A / F (am / fm) button, turn on the radio station with the VOL / OFF knob.
Grid switching is performed by the CH9 button.
SWITCH 0\5
MJ-600- Hold down DW/M2 to turn on the radio. MJ-600 Plus - Hold BP/RB to turn on the radio.
Central Grid - D
Megajet MJ-700.
Switching between 80CH/450CH.
If *) there is no grid E and others (switching grids with the BD-EMG button, far right)
then turn off the station, hold down the AM-FM and ASQ-TSQ buttons (two extreme left)
turn on the station, wait for the beep signal (5-10 seconds), release the buttons.
After that, switching grids with the BD-EMG button, the far right.
IMPORTANT: when switching 80CH / 450CH and back, the rest of the settings are reset to FACTORY!
those. everything that you yourself have wound up with the FUNC key will be reset.
*) Note: in 80CH mode, the station does not develop maximum power,
stations of the first batch give out 1-4 W,
stations of the second batch - 8.
So everyone usually goes to 450CH immediately after purchase.
And who hasn't switched - he will have a bonus in the form of a station now at 16-18 W
Central mesh - D
Megajet MJ-800
Turn on the power while holding the SCH and TOT buttons.
Grid switching is performed by the CH9 button.
Central Grid - D
MegaJet 3031M
While holding down the two buttons "DW" and "CH9" turn on the radio with the VOL / OFF knob. Grid switching is performed by the CH9 button.
Central Grid - D
MegaJet-3031M Turbo
With the A / F button pressed, turn on the station, switch grids with the Ch9 button.
Central grid - E
Scroll through the channels, the grid will switch automatically.
Yosan Stealth 5
The grids are cycled through by pressing the EMG/-5K – M6 button and displayed to the right of the channel number. The central grid is indicated by the letter "C". Pressing the EMG/-5K button once - M6 turns on the "D" reticle, then "E", "A+", "B+", etc. The highest frequency grid is "E+", after it the lowest grid "A-" is switched on, then "B-", and so on until "E-", after it the grid "A" is switched on, then "B", and again the central grid "C".
Yosan Excalibur/Turbo
The grids are cycled through by pressing the EMG-SHIFT button and displayed to the right of the channel number. The central grid is indicated by the letter "C". Pressing the EMG-SHIFT button once turns on the grid "D", then "E", "A+", "B+", etc. The highest frequency grid is "E+", after it the lowest grid "A-" is switched on, then "B-", and so on until "E-", after it the grid "A" is switched on, then "B", and again the central grid "C".
Yosan Evolution
Grid switching is carried out by the “Band” button . Central grid "C".
Vector VT-27COMFORT HP
While holding down the CH9-CH19-CH15 button, use the Down or Up buttons to select the desired grid (A,B,C,D, etc.).
Central grid - D.
Vector VT-27COMFORT
Hold down the CH9-CH19 button for more than 2 seconds, the station enters the frequency band selection mode. Use the Down or Up buttons to select the required grid (A,B,C,D, etc.).
Central grid - D.
VECTOR VT-27 LUX
UP (Channel Switch) button on the PTT. Each press of the button increases the channel number by 1. Pressing and holding the button for about 3 seconds allows you to quickly increase the channel number in increments of 1. Pressing and holding the button for about 10 seconds switches the channel grids (A, B, C, D, E, F, G , H, I, L).
Central Grid - D
Switching the Vector VT-27LUX to Multigrid Mode
MODE button.
Pressing this button repeatedly allows you to select the desired function.
This button allows you to select the frequency range of the radio.
To select the frequency range of the radio station, turn it on and immediately press the MODE button (when all segments of the LCD display are displayed), then use the up/down channel buttons to select the required frequency range.
To exit the frequency range selection mode, press the MODE button again.
Band codes I0, I2 , DE, D2, EU, CE, SP, FR, UK, PL, SW. The table shows the characteristics of the maximum open frequency standards:
Code What it corresponds to Specification
*EU A*
"European" grid from 1 to 45 ch.
450ch AM/FM 10W
"Russian" grid from 1 to 45 ch.
(Frequency ratings end in "0")
450ch AM/FM 10W
Continuous range: 1 to 45 ch.
"European" grid and "Russian" grid
900ch AM/FM 10W
"Holes": 3, 7, 11, 15, 19 ch. each grid
(Frequency ratings end in "5")
50ch AM/FM 10W
Vector Navigator
Switching of grids is carried out by the button "BD/DW". Central grid "D".
Vector Radius
Grid switching - by holding down the "CH9-CH19-CH15" button, and using the ▼ (Down) or ▲ (Up) buttons scroll through the grids. Two letters will light up on the indicator - the first indicates the frequency standard (E-European, R-Russian), the second indicates the grid. Central grid "D".
Vector Smart/ Smart Turbo
Grid switching - by holding down the "EM / B" button, and using the ▼ (Down) or ▲ (Up) buttons scroll through the grids. Central grid "D".
TTi TCB-551
While holding down the AM/FM key, turn on the radio. The LCD display shows information about the frequency grid. To change the band, press the Up/Down keys while the grid information is flashing on the screen. Press the microphone's PTT key or wait 5 seconds to confirm the selection and return to the receive and transmit mode. Central grid "D".
Albrecht 4200
Advanced mode of the radio station - in this mode, ten grids of 40 channels each are available. In this mode, switching between grids is carried out by the "BAND" button located on the PTT. Central grid "E".
Albrecht 6310
To change the grid (letters A. . . F) in RU and PL standards, the following operations must be performed:
1) Press the "AM / FM" button and hold it down until the indicator shows the letter - the grid identifier (it will take about 1-2 seconds), then release the "AM / FM" button.
2) Use the channel selection switch buttons to select the desired grid (letter A . . .F).
3) Press the "AM / FM" button again and keep it pressed until the indicator returns to the working state - channel number indication.
Switching the radio to multi-grid mode:
Hold down the AM/FM button to turn on the radio station and use the Up and Down buttons to select the desired grid.
Central grid "D".
Optim 270
Revision number 1. Grids and standards switch (0/5). The operating position is the position of the switch in the CH position. To switch d to the European frequency grid, move the switch to position E. The grid letter and standard will light up on the display. For example, dE. Where d is the grid and E is the standard, fives. The channel switching buttons can be used to select the desired frequency grid. There are grids from A to F, a total of 6 frequency grids with 40 channels in each grid. And you need to move the switch back to the CH position. Similarly, there is a switch to the Russian frequency grid, zeros, P. For each standard, the grid and channel number are saved.
Revision No. 2 (12/30/2014) To change the grid, you must move the mode selector to the BAND position and select the frequency grid using the channel switching buttons. Switching between Europe (5) and Russia (0) is carried out in the same way as before.
Central grid "D".
Optim 380
The BAND button allows you to switch frequency grids. A total of 10 frequency grids from A to L. Center grid "D".
Optim 778
"BAND/TOT" button switches frequency grids . Central grid "D".
Power switch: "A/F/HI" button. In combination with the FUN button, it allows you to switch the output power level. 10/20/50 watts in FM and 10/20 watts in AM.
Optim Apollo
To switch grids use the key "BAND / M1" Central grid "D".
Disclosure of the radio station: To enable the extended mode, it is necessary - with the radio station turned off, hold down and hold the - F key (on the PTT). We turn on the radio. We hold the F key until the inscription OPEN MODE appears on the PTT display. The radio station is open.
Power switch: H.L button. Switches the output power of the radio. In HI mode, the station delivers about 8 watts of power, and in LO mode, about 4 watts.
Optim Piligrim
The "BAND" button switches frequency grids . Central grid "D".
How to open a radio station? To turn on the extended mode, turn off the radio, then hold down the AM / FM key and turn on the radio. The 4D icon will then appear on the display. Use the CH+ or CH- keys to select the OP mode and then turn the radio off and on again. As a result, BAND frequency grid switching modes, -5 kHz frequency shift and transmitter output power selection will be available.
Maycom EM-27D
To switch grids, press button 1, the lower menu will light up, then button 6 (under the inscription BAND). The station will switch grid up. Further pressing the button 6 each time the station switches the grid above.
You can simply turn the channel switch knob to go to the next grid.
Central Grid - C
Alan 9001
Switching grids and channels - Valkoder or button BAND.
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This station is designed to solve completely different problems. Apparently, in this way, the RKK company decided to divide the market and earn even more money.
And I dare say they succeeded. The station is quite interesting, it is not designed to work in AM, although it can work in this modulation. Her path is frequency modulation, or FM.
So, if you're a CBS taxi driver, or you just use the band, mostly FM, and don't want to spend a lot of money on a walkie-talkie, this station is for you. In the harsh operating conditions of taxi companies, and it is there that the MegaJet MJ-300 is most often used, the station showed its best side. It is extremely simple and reliable. Now, let's take a closer look at it.
The station comes in a glossy silver colored cardboard box. Like the MegaJet, the cardboard is thin but strong.
The station is well packaged. Inside the box there is a plastic insert that absorbs shocks and is designed to divide the space for transportation.
The kit comes with the radio itself, instructions for English language, headset, mounting bracket and fasteners.
Appearance
In appearance, the station is very reminiscent of MegaJet, the general pedigree can be traced well. The body dimensions remain the same.
The front panel is made of plastic. The plastic looks cheaper than . It is more slippery and glossy.
The case consists of a chassis to which all internal electronics are attached, two metal covers, top and bottom. Each cover is attached separately with 4 self-tapping screws. As I already wrote in, this is not very good, because at high volume such a design will rattle.
Ergonomics has changed. Now it is more convenient to use the station. The volume and squelch controls are still side by side, but they're now vertical, which I find more comfortable. The handles rotate with little effort, but gently, and without jamming. On the front panel there are buttons for switching channels, a button for changing modulation, a button for enabling channel scanning, this mode has been added here. The CH9 button performs many functions, which are described below.
The display, like that, has a pleasant amber backlight. The indication completely repeats the indication of the younger brother. Channel number, grid letter, modulation and mode 0/5 are displayed here.
The disadvantages of the display are the same. It is clearly visible only from the front and from above. You can't see anything from below.
The headset connector is modern 4-pin, looks reliable.
The headset itself is very simple, like that, it has only a microphone and a PTT.
The headset wire is also very soft and should not stiffen in the cold.
At the back of the station there is a connector for connecting an antenna, a jack for connecting an external speaker and a power cord.
There is no quick disconnect connector on the wire.
The speaker is located on the bottom cover, as in almost all radios. civilian range. There is also a marking plate with the serial number.
Functions
In general, the station repeats the functions of its younger brother, but there are some features. The station has 40 channels in normal mode, and 120 channels in extended mode. AM / FM modulation, work in zeros and fives (0/5), in addition, there is a channel scan function, which can be useful in unfamiliar areas, the function is displayed on a separate SC button. The main distinguishing feature is the presence of an automatic noise suppressor with manual adjustment. If sellers on the market will tell you that the station has a threshold noise suppressor, do not believe it! A real spektralnik, but with the ability to adjust, which is a plus.
To transfer the station to multi-grid mode, you need to turn off the station, hold down the A / F button and turn on the station. After a couple of seconds, you need to release the button and the display will show EP, which means that we have switched to multi-grid mode. Grids are switched by button CH9. The grids correspond to the following M - C, H - D, L - B. A total of 120 channels. The station has a built-in attenuator, which can be turned on if you hold down the CH9 button. The letters Lo (local on) will appear on the screen, indicating that the attenuator is on. To turn off, we do the same and LF (local off) should appear on the screen. This feature can be useful in noisy environments. To switch between fives and zeros, you need to turn off the station, hold down the A / F and CH9 keys and turn on the radio. The buttons should be released after a couple of seconds. The display will show the number 5 indicating that the station has switched to zeros. The scanning function will be turned on with the SC button. Scanning will continue until the squelch opens.
Inside
The station is made on a printed circuit board made of green textolite. Installation is neat, soldering flaws are not noticed. Not washed flux, too.
And the one in the photographs was left by your obedient servant during revision. I use a no-clean flux gel. The components on the board are not signed, which may make it difficult to find the right item.
Some of the parts are not soldered, which suggests that this printed circuit board is also used for the production of other radios. The output stage is made according to the classical scheme, on 2SC2314 and 2SC2078.
The overall impression of the filling is positive.
Declared characteristics
Frequency range: 26.965…27.855 MHz
Number of channels: 120 AM/FM
Transmitter power: 10W
Power: 13.8V
Dimensions: 138(w) x 40(h) x 125(d)
Weight: 600 gr
Modifications
About the improvements of the MJ-300.
Outcome
MJ-300, like, is not suitable for all tasks. They harmoniously divide the market and should be used in the niches intended for them. Due to the fact that the station has only one automatic noise suppressor, its use in the truckers' channel (15AM) is not advisable, since it will simply annoy you with its constant triggers that are not on the case. If they offer it to you for Channel 15, don't take it! For these purposes, a threshold squelch is most suitable, as, for example, in the MJ-100. The path of the MJ-300 is either working in a taxi, or using it for other tasks where frequency modulation is used.
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 advice to tune in to 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.
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 its low output power, small LCD screen and compact dimensions - quite typical features of a budget solution. The walkie-talkie 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 | 13.6V |
Dimensions (WxDxH) | 138x125x40 mm |
The 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 of | 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.
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 the MegaJet MJ-300 car radio. The MegaJet MJ-300 radio station is easy to use and will provide you with safe, efficient and reliable communication. Please read this manual carefully before using. 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 of the MegaJet MJ-300 radio should be carried out by qualified personnel in a specialized service.
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 issues, turn off the radio in areas where it is 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, until the PTT or the “SC” button is pressed.
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 wiring 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.
Because the MegaJet radio station MJ-300 is equipped with a power filter to eliminate interference from the engine ignition system, you can connect it 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, on vehicles, mainly shortened antennas 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. 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 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.
On fig. Figure 3 shows five typical car antenna installation locations: (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.
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. Various types of antennas are configurable different ways so please read the manual. 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 you can get 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 no channel hopping is in progress, 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.