Megajet 3031m turbo operating instructions. Mechanical work during installation

In this mode, the radio monitors rapidly changing levels of external noise and
interference of an industrial city and automatically adjusts the response threshold
noise suppressor to a useful signal, without distracting the driver’s attention.
Turn the handle "SQ" to the far left position. This will turn off the squelch and
background noise will appear in the dynamics. Turn the handle slowly "SQ" clockwise until
background noise will not disappear. In this position the receiver will remain silent in the absence of
signal, but a useful signal with a level slightly higher than the noise level will overcome
the effect of the noise suppressor will be heard. With further turning of the knob the action
The noise reduction is progressively increasing, and a stronger signal is needed to overcome it. For
To receive weak signals or turn off the squelch circuit, turn the knob to
end counterclockwise.
In ASQ mode, the manual squelch control is disabled and the squelch level
is set to the average value. Turning on and off ASQ mode is done with
headset button AQ, or from the front panel with a button

ASQ/COL. When ASQ is turned on

the symbol appears on the display "AQ".

6. Setting the type of modulation.

To switch the modulation type, use the button

A/F while on the display

symbol lights up "AM" when amplitude modulation is turned on, or "FM" when turned on
frequency modulation.

ATTENTION!!!

All your stations should have the same operating mode,

either FM or AM

.

7. Transfer.

To “transmit”, press the transmit key on the microphone, while the meter
transmitted power (RF) at the bottom of the display will show the relative output level
power. Speak into the microphone, holding it ~10 cm away from your face. Talk normal
voice, don't shout. When you transmit, the receiver turns off - reception is not possible. Likewise,
Your signal cannot be received by another station if it is in transmit mode.
You need to take turns speaking and listening. To enter receive mode, simply release the PTT button.
microphone.

ATTENTION!!!

Transmission operation with the antenna disconnected or not tuned is not possible.

is permitted and may damage your radio.

Sometimes the transmit key may be accidentally pressed for a long time. This creates
interference with other correspondents working on the same channel as you, and may also cause
to the failure of your radio due to overheating. To prevent such cases
The TOT (TimeOut Timer) function is used. To turn it on, press and hold for 1 second
button MUT/TOT until the “TOT” symbol appears on the display. Now it's time for continuous work
radio station transmission will not exceed 3 minutes, after which the transmitter will automatically
will turn off and the “TOT” symbol on the display will start blinking. The repeat function is disabled
long press of the button MUT/TOT.

8. “European” and “Russian” grids.

In the civil band, there are two most common frequency standards.
They differ in that in one of them the frequencies corresponding to the channels end in
“5” (for example, channel 9 of the central grid has a frequency of 27065 kHz), and in the other - at “0”
(respectively 27060 kHz). The first of them is usually called the “European” grid, and in it
Most Russian correspondents work. The second is the “Russian grid”. Despite
name, is used quite rarely in Russia, and is most common in
Belarus and Eastern European countries. Your radio supports both of these standards. By

Automotive walkie-talkie MegaJet MJ-3031M Turbo - CB radio station, which is highly popular. It is known to many motorists, as it has been produced for quite a long time. A model was produced before itMegaJet MJ-3031M , which was very popular among drivers, and which is still in deserved demand. These two models are very similar in appearance, but there are still some differences. We’ll talk about the differences later, but for now let’s look at what’s interesting about this model.

The MJ-3031M Turbo radio has a large LCD display that displays all information about enabled functions, channel number or frequency. On the front panel there are conveniently located volume/power control knobs. (VOL), squelch level adjustment (SQ) and channel switch (CH). To the left of the display, there are keys for three memory cells (M1-M3) and a button for switching to frequency mode (FR) in a vertical row. Below the display there are function switching buttons in a row. Some of the keys have a second function that is activated by a long press.

The electrical circuit of the receiver is built on a superheterodyne with double frequency conversion. The circuit uses a frequency synthesizer with phase-locked loop (PLL) and quartz stabilization, which ensures high stability of the radio station parameters. A powerful radiator is installed on the back of the radio to cool the output transistors.

The color of the MegaJet MJ-3031M Turbo front radio may vary from what is shown in the photo as they are sometimes supplied in black.

Features and functions of the Megajet 3031M Turbo radio:

• non-volatile channel memory
• separate frequency synthesizer on the LC 7152 chip
• front panel with large LCD display
• two backlight colors (red and yellow)
• adjustable automatic noise reduction
• reliable PTT with dynamic microphone DS-3051-150 Ohm
• scan mode (SCAN)
• dual receive (DW) mode
• fast offset "-5 kHz" ("Russian grid")
• transmit and receive signal level indicator
• two-stage adjustment of receiver sensitivity.
• emergency tuning to channel 9 (CH9)
• Quick mute function (MUTE)
• transmission time limit function (TimeOut Timer – TOT)
• keypress confirmation function (BP)
• function of sound confirmation of the end of transmission (Roger Beep)
• Possibility of connecting an external speaker
• channel/frequency indication (FR)
• three channel memories
• Illuminated control buttons

Technical characteristics of the MJ-3031M Turbo radio station:

Operating frequency range: 25.165 ~ 28.755 MHz

Number of channels: 40/320

Receiver sensitivity: AM: 0.5 uV(S/N 10dB) FM: 0.5 uV (S/N 20dB)

Automatic threshold

Noise Reduction: 0.5 uV

Signal to noise ratio: 40 dB

Transmitter output power: 15 W (AM)/18 W (FM)

Frequency stability (TX): +/- 300 Hz

AM modulation ratio: 90%
FM frequency deviation: 2 KHz

Current consumption: no more than 2.5 A
Antenna characteristic impedance: 50 Ohm

Dimensions: 150x145x48

Weight: 1000 g (1500 g with accessories and packaging)

Now let's look at the differences between authorizationsMJ-3031M Turbo from the walkie-talkie MJ-3031M . They differ slightly in the appearance of the front panel - the location of the keys and control knobs is different. The MJ-3031M Turbo radio has increased power up to 15 W on AM and up to 18 W on FM, the MJ-3031M has a power of 10 W. The MegaJet 3031M Turbo has added the following functions: non-volatile memory, changeable display backlight (red and yellow), LOC function (this function allows you to reduce the sensitivity of the receiver and receive only strong signals, for example on the Moscow Ring Road, where the airwaves are very clogged and there is constant interference from different stations , when using this function, reception will be in a zone of 2-3 km), Roger Beep function (end of transmission signal). The MJ-3031M Turbo radio has a zero-five (0/-5) (RU) switch, with just one click, and a TOT function - limiting transmission time. The TOT function can be useful if the driver accidentally sat down or put something on the PTT, or it was simply stuck. When the TOT function is enabled, the transmission will stop after 60 seconds.

In this mode, the radio monitors rapidly changing levels of external noise and
interference of an industrial city and automatically adjusts the response threshold
noise suppressor to a useful signal, without distracting the driver’s attention.
Turn the handle "SQ" to the far left position. This will turn off the squelch and
background noise will appear in the dynamics. Turn the handle slowly "SQ" clockwise until
background noise will not disappear. In this position the receiver will remain silent in the absence of
signal, but a useful signal with a level slightly higher than the noise level will overcome
the effect of the noise suppressor will be heard. With further turning of the knob the action
The noise reduction is progressively increasing, and a stronger signal is needed to overcome it. For
To receive weak signals or turn off the squelch circuit, turn the knob to
end counterclockwise.
In ASQ mode, the manual squelch control is disabled and the squelch level
is set to the average value. Turning on and off ASQ mode is done with
headset button AQ, or from the front panel with a button

ASQ/COL. When ASQ is turned on

the symbol appears on the display "AQ".

6. Setting the type of modulation.

To switch the modulation type, use the button

A/F while on the display

symbol lights up "AM" when amplitude modulation is turned on, or "FM" when turned on
frequency modulation.

ATTENTION!!!

All your stations should have the same operating mode,

either FM or AM

.

7. Transfer.

To “transmit”, press the transmit key on the microphone, while the meter
transmitted power (RF) at the bottom of the display will show the relative output level
power. Speak into the microphone, holding it ~10 cm away from your face. Talk normal
voice, don't shout. When you transmit, the receiver turns off - reception is not possible. Likewise,
Your signal cannot be received by another station if it is in transmit mode.
You need to take turns speaking and listening. To enter receive mode, simply release the PTT button.
microphone.

ATTENTION!!!

Transmission operation with the antenna disconnected or not tuned is not possible.

is permitted and may damage your radio.

Sometimes the transmit key may be accidentally pressed for a long time. This creates
interference with other correspondents working on the same channel as you, and may also cause
to the failure of your radio due to overheating. To prevent such cases
The TOT (TimeOut Timer) function is used. To turn it on, press and hold for 1 second
button MUT/TOT until the “TOT” symbol appears on the display. Now it's time for continuous work
radio station transmission will not exceed 3 minutes, after which the transmitter will automatically
will turn off and the “TOT” symbol on the display will start blinking. The repeat function is disabled
long press of the button MUT/TOT.

8. “European” and “Russian” grids.

In the civil band, there are two most common frequency standards.
They differ in that in one of them the frequencies corresponding to the channels end in
“5” (for example, channel 9 of the central grid has a frequency of 27065 kHz), and in the other - at “0”
(respectively 27060 kHz). The first of them is usually called the “European” grid, and in it
Most Russian correspondents work. The second is the “Russian grid”. Despite
name, is used quite rarely in Russia, and is most common in
Belarus and Eastern European countries. Your radio supports both of these standards. By

Car radiosMEGAJET 3031 Turbo with increased power up to 20 W

The RKK company has improved its legendary MEGAJET 3031 walkie-talkie and is introducing a new Turbo version for all car enthusiasts. The car radio operates in the civilian frequency range of 27 MHz and allows you to organize uninterrupted communication sessions at a distance of 20 km along the highway and 10 km in the city.

The main features of the improved MEGAJET 3031 Turbo model are an output power of 20 W and an expanded frequency range of up to 320 channels. Together with the adjustable automatic noise reduction system, you can easily exchange information and receive up-to-date traffic information.

Who is the radio station suitable for?MEGAJET 3031 Turbo?

• For drivers and taxi service dispatchers. The radio can be used in cars or stationary in the dispatch service. When connected to a stationary antenna, communication with drivers is carried out at a distance of up to 40 km.
• For truckers. Switching between Russian and European frequency grids is now done by pressing just one button. The front panel has an emergency tuning button for channel 9 (CH9).
• For travelers and communication lovers. The walkie-talkie allows you to quickly and easily exchange information between drivers or receive up-to-date information about the road situation. The active noise reduction system eliminates interference in communication sessions and ensures “clean” reception/transmission.

4 Features of a Car RadioMEGAJET 3031 Turbo

The radio station operates in the civil CB band (Citizens Band) at frequencies 25.615-28.305 MHz with support for grids C, D and E. It is possible to quickly switch between grids in Europe and Russia with a downward shift of 5 kHz. For reliable operation, a separate frequency synthesizer with an LC 7152 chip is provided.

Among the main advantages of MEGAJET 3031 Turbo it is worth highlighting:

• New execution and design. The front panel with control buttons is made in the “Black” theme. The large LCD display with frequency information is made using Black Matrix technology with high contrast. This allows you to see the image on the screen even in strong light conditions. The backlight is available in two options: red and yellow.
• Active noise reduction system. IN MEGAJET 3031 Turbo uses threshold and spectral noise reduction on the outputs of AM and FM detectors. The noise reduction threshold is preset at the factory and can be additionally adjusted by a manual two-stage system.
• Functional PTT. The buttons for turning on the noise reduction thresholds and switching channels are located directly on the PTT switch. This allows you to conveniently carry out radio communication sessions without being distracted by the radio panel. You can exchange information and monitor the road at the same time.
• Non-volatile channel memory. MEGAJET 3031 Turbo has three memory cells with EEPROM function. After turning off the radio and reapplying power from the battery, the device remembers the last used channels and starts working with ready-made band settings.

Additional functionsMEGAJET 3031 Turbo

• Mute. Quick mute.
• TimeOut Timer. Possibility of limiting transmission time.
• B.P.AndRoger Deep. Sound confirmation of the start and end of the transmission.
• SCANAndS.W.. Scanning and dual reception modes.
• Reset. Possibility of returning to factory settings.

What is included in the package of a car radioMEGAJET 3031 Turbo?

The device comes with a push-to-talk control with a dynamic microphone DS-3051-150 Ohm, as well as a power cord with a fuse. The radio can be mounted anywhere in the car using special brackets and brackets that are included in the package.

On the rear panel there are separate connectors for connecting an external speaker for 3.5 jack and a UHF-Female antenna.

Instructions for use of the car/base CB radio MegaJet MJ-3031M

BEFORE USING THE MegaJet MJ-3031M RADIO, PLEASE READ THIS TECHNICAL DESCRIPTION.

INTRODUCTION

SPECIFICATIONS

PURPOSE OF CONTROLS

MULTI-FUNCTIONAL LCD DISPLAY

INSTALLING A RADIO IN A CAR

INSTALLING AND CONFIGURING A CAR ANTENNA

RULES FOR USE OF THE RADIO STATION

INTRODUCTION

The MegaJet MJ-3031M car CB radio station is developed on the basis of modern technologies and is the first model of a new generation of CB radio stations.

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 receiver is a double-conversion superheterodyne with a dual-loop tunable input circuit, crystal and ceramic filters, and a low-frequency noise limiter.

A completely new design of the radio housing and control panel provides maximum ease of use. Particular attention is paid to saving time in accessing the radio station controls.

DISTINCTIVE FEATURES

240 channels on subbands A, B, C, D, E and F

Latest Black Matrix LCD display with current mode display

12-segment signal level/strength indicator

Return to previous channel when scanning

Memory of 4 channels according to user's choice

Built-in automatic noise reduction system

Listening to two channels in parallel

SPECIFICATIONS

To increase reliability, the radio control system uses contactless switching using 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

Selectivity for side reception channels of at least 45 dB

TRANSMITTER

PURPOSE OF CONTROLS

Rice. 1. View of the control panel.

SQUELCH control - "Noise suppressor". This control is used to adjust the noise threshold level when there is no received signal. To achieve maximum receiver sensitivity, this control must be set to a position in which self- or ethereal noise just begins to be suppressed. Rotate the control clockwise until the noise in the speaker disappears. The received signal should be just above the squelch threshold level. Further clockwise rotation of the control increases the squelch threshold for the signal that can be heard. When the knob is in the extreme right position, only very powerful signals can be received.
Be careful when adjusting, as careless setting of the noise reduction level can significantly degrade the sensitivity of the receiver, making it impossible to receive weak signals.

ON/OFF/VOLUME - "Power On/Off, Volume Level Control." Turn the knob clockwise to turn on the power and set the desired volume level.

L.C.R. button - "Return to Previous Channel." If the radio is scanning and has stopped on a channel, and you need to return to the previous channel on which a signal was detected during scanning, then when you press the button "L.C.R." the scanning mode will stop and the radio will go to the previous channel. The number of the previous channel will be indicated on the LCD display.

ASQ - "Automatic Noise Cancellation". Pressing this button turns on the automatic noise reduction function. While this function is operating, the display shows "AQ" and manual noise reduction mode using the SQ control do not work. To disable this function, you must press this button again.

SCAN button - "Scanning". When you press this button, the radio receiver automatically scans (changes through channels) until it tunes to a busy channel. In this case, if the button is not pressed again within 5 seconds, scanning continues until the next busy channel. The mode is accompanied by a sign indication "SC" on the LCD display board.

AM/FM switch - "AM/FM". Select AM or FM modulation type. AM is used for short and medium range communications to provide the most natural sound. FM provides high-quality sound and information exchange at any range, including long ranges, when the received signal is strong enough and reception is possible. But, first of 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 channel 10, press the switch "DW". A flashing sign will appear on the LCD display "DW". Then tune in to channel 20 and, having set the required noise reduction level, press the button "DW" secondary. Now the radio station will tune to channels 10 and 20 alternately with an interval of 0.5 seconds. If necessary, you can contact the subscriber via one of the two selected channels, and after the connection ends, the radio station will again switch to 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 four buttons. The channel will be stored in the memory location under the number of this button. If you need to call this channel, just press the button with this number and an indication of its number will appear on the left side of the LCD display.

Button CH9 - "Channel 9". The factory setting is to enable the emergency channel. To enter emergency contact, simply 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" when buttons are pressed simultaneously "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, you must turn off the station and turn it on again while pressing the buttons simultaneously "DW" And "CH9"(the station automatically switches to single-grid mode after removing the voltage at the power connector).

Switch CH (CHANNEL) - "Channel Switch". This is a two-way rotation knob with which you can tune in to the selected channel.

BEP- When you press this button, the display shows "VR". This means that pressing any function key will be accompanied by a sound signal. To disable this function, you must press this button again.

FRQ (Frequency/Channel) button - "Channel Frequency/Channel Number". When you press this button successively, the channel frequency or channel number will be displayed on the LCD display, respectively.

SRF scoreboard - LCD display. Information board for monitoring the status and operating modes of the radio station.

U.P.- By pressing this button on the headset you can switch to the next channel instead of using it for this purpose CH switch.
DN- By pressing this button you can switch to the previous channel instead of using it for this purpose CH switch.

AQ - "ASQ on the microphone". For convenience, you can enable (disable) the automatic noise reduction function from the microphone.

MULTI-FUNCTIONAL LCD DISPLAY

The design of the radio station uses the latest multifunctional liquid crystal display (LCD) of the Black Matrix type with memory of the current mode and with additional backlighting.

The 16 mm channel number indicator digits are especially convenient when using the LCD display.

The information panel of the LCD display displays the main functional parameters of the operating modes of the CB radio station. The purposes of the mnemonic signs displayed on the display panel are shown in Fig. 1.

1, 2, 3, 4 - Numbers of memory cells in which four pre-selected channels are stored.

AM FM - AM/FM. Indication of one of these signs means the choice of AM or FM modulation type.

SC (Scan) - Scanning. Sign indication "SC" means the receiver is operating in automatic scanning mode.
To implement this function, turn on the power of the radio and set the required volume. Adjust noise reduction. Click the button "SCAN" and the scanning will begin. The sign will appear on the LCD display "SC". When a channel is detected whose signal exceeds the squelch level, scanning stops for 5 seconds. and resumes again until the PTT or button is pressed "SCAN".

DW (Dual Watch) - Parallel Listening to Two Channels. Sign indication "DW" means turning on the functional mode of parallel listening to two channels in the radio station.
If the radio station scan is paused on a specific channel that is occupied by the desired correspondent, press the PTT button to start the session. In this case, scanning stops and the radio switches to transmitting mode.

NB (Noise Blanking) - Noise Compensation. Sign indication "NB" means the activation of the compensation system for amplitude periodic low-frequency impulse interference 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 RF gain provides local communication.

"40d" / "27.40 5 " - Indication of Channel Number / Frequency. The 5-digit digital indicator in the central part of the LCD display indicates the number of the selected channel or its frequency.

SRF (S/RF - meter) - Level indicator. The 12-segment meter shows the relative levels of the received signal or transmitter output power.

INSTALLING A RADIO IN A CAR

The radio is intended for use in cars with a 12-volt battery and a grounded negative.

Before installing the radio, check that your vehicle meets this requirement.

A mounting bracket and a microphone holder are used to mount the radio in a car.

WHERE TO INSTALL A 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 car. The best place for this purpose is under the dashboard of the car.

Attention: When choosing a location for installing the radio, make sure that it does not interfere with the driver or impair access to vehicle controls. When laying connecting cables, observe safety requirements. If the radio station or connecting cables are inconveniently located, you may lose control of the vehicle.

MECHANICAL WORK DURING INSTALLATION

Step 1: Using caution, use the mounting bracket as a template to mark the mounting holes under the dash. To mark 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 supplied 10mm self-tapping screws (see Figure 2). Particular care should be taken when drilling holes to avoid damaging the connecting harnesses and electronic devices located under the panel.

Fig.2. Attaching the radio using a mounting bracket.

RADIO STATION INSTALLATION

Step 1. Insert the radio into the mounting bracket until it is aligned with the tabs (see Figure 3). Adjust the radio body to the optimal angle for ease of access.

Step 2: Attach the radio clips, making sure to provide a place to connect external cables to the rear of the radio.

Rice. 3. Fastening the radio station with clamps.

POWER CONNECTION

Since the MegaJet MJ-3031M radio station is equipped with a power supply filter to eliminate interference from the engine ignition system, it can be connected to the vehicle electrical system at any point. To reduce interference, it is better to use the 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 connecting power to the radio.

Step 2: Securely connect the black "negative" wire from the radio directly to the vehicle body. For best operation of the radio, reliable contact with the metal of the body is required.

Step 3: Connect the red "positive" wire from the radio with the built-in fuse holder to the fuse block ("cigarette lighter" or directly to the positive terminal of the battery). Typically, the most convenient point to connect the radio is the fuse box. 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 power connector on the back of the radio.

INSTALLING AND CONFIGURING A CAR ANTENNA

In the CB range, antennas with vertical polarization are most widespread. This is due to the fact that it is difficult to place an effective antenna with horizontal polarization on a car, and CB communications are 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-length 1/4 wavelength whip (2.75 m) and a short matched whip antenna (from 0.5 to 1.9 m). Due to the large length of full-size antennas on cars, shortened antennas with a length of at least 1.2 m are mainly used, in various designs with mounting through a hole in the roof, on a bracket behind the gutter flange or on a magnetic base (see Fig. 6 ).

Rice. 6. Typical installation locations for car antennas.

Antennas on a magnetic base have the advantage that they can be easily retracted inside the car when parked, and the strength of the magnet ensures its secure attachment during shaking and high-speed driving.

Its radiation pattern depends on where the antenna is installed. 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's axis. When placing the antenna on the rear trunk, its pattern will face forward.

Here are some basic rules to consider when choosing an antenna location:

Install the antenna at the highest point of the vehicle.

The more of the antenna is located 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.

Ensure that the supply cable screen is securely connected to the metal of the body at the antenna location.

If the antenna is equipped with a standard cable, it is not permissible to change its length.

Be careful not to damage the cable.

In Fig. Figure 6 shows five typical installation locations for a car antenna: (1) rear bumper, (2) rear trunk lid, (3) water drain flange, (4) hood, (5) roof.

To receive qualified advice regarding the choice of antenna type and location of its installation, contact your retailer.

ANTENNA INSTALLATION

Carefully follow the manufacturer's antenna installation instructions.

Attention! Never turn on the radio with the antenna disconnected or with a damaged antenna cable. The result may be failure of the radio station.

CAR ANTENNA SETUP

The installed car antenna must be tuned to resonance at the mid-range frequency. To configure and periodically monitor the antenna and antenna cable, an SWR meter is used, which is connected to the circuit between the radio station and the antenna cable using a separate adapter cable of minimum length. Different types of antennas are configured in different ways, so you should read the instructions. As a rule, tuning an antenna that has reliable galvanic (or capacitive - across the entire area of ​​the magnet) contact with the conducting underlying surface (area) at the antenna location is carried out by decreasing or increasing the length of the pin. Try to achieve a minimum SWR (unity ideally) in the middle of your chosen frequency range (for example, between the two most frequently used channels). And if at the same time at the edges of the “working” range you manage to get an SWR of no more than 1.5, then your choice of channels is correct and the antenna is tuned perfectly.

WHAT IS IMPORTANT TO REMEMBER WHEN OPERATING A CAR ANTENNA

Attention, possible consequences! Never turn on the radio station for transmission, even for a short time, with an untuned antenna or a “out-of-tune” antenna, when reliable electrical contact of the cable braid and the antenna “ground” 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 power lines of the near electromagnetic field occurs on the outer surface of the antenna cable braid and all electrically conductive surfaces of the body and, most unpleasantly, high-frequency surface currents of significant magnitude arise inside the car interior. Even nearby correspondents stop receiving you, and the PTT slightly burns your palm. The level of these high-frequency voltages is especially significant at the so-called “concentrators” - spatial conductors whose electrical length (physical length divided by the shortening factor) is close to or a multiple of a quarter of the wavelength. Obvious "hubs" include loose wiring harnesses under the dashboard, plugged-in cell phone charger cords, and the coiled radio PTT cord. Through these conductors, high-frequency currents in an unintended way affect the elements of the electrical circuit of 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), memory chips of car radios and, rarely, cell phones (irreversible damage), the processor engine control system (short-term malfunction ). Let us note, however, that such failures and damage due to unacceptable operation of the radio station on an unmatched load (“out of tune” antenna), as statistics show, occurred mainly only in cases of using additional high-power equipment. (For those who assume or are already operating such “auxiliary” equipment, we inform you that even with a fully operational and tuned antenna, but if the negative power supply wire of this equipment is broken or if the cross-sectional area of ​​this wire is insufficient, an undesigned redistribution of power lines of the near electromagnetic field also occurs with corresponding consequences).

Another dangerous factor in the event of a violation of the integrity of the contact of the antenna ground with the underlying surface and cable braid, which often leads to malfunction and/or irreversible damage to the microprocessor of your radio station (even if it is turned off), is the difference in static potentials that arises in this case between car body and a long antenna pin. In addition to the deterioration of the communication range, rustling and crackling noises are observed in the dynamics of the radio station when the car is moving. Static stress occurs due to friction with the air flow and the road surface. In this case, there is different humidity at the levels of the road surface, wheels, body and antenna rod. 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, when you first notice 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 monitoring and minimal routine maintenance of the quality of connections, especially during periods of changing seasons, will completely protect the careful driver from unpleasant “non-warranty” situations and unnecessary costs.

RULES FOR USE OF THE RADIO STATION

Turn on the radio by rotating the "On/Off and Volume Control" knob clockwise. Set the required sound volume.

Adjust the noise reduction threshold using the “Noise Suppressor” control in accordance with the instructions in paragraph 3.1 of this manual.

Select the desired channel using the channel switch (section 3.11).

Note: If the channels are not rebuilt, 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 5 cm from your mouth and speak in a normal, intelligible voice.

RECEPTION MODE

Simply release the PTT button and listen to your correspondent, using the volume and squelch controls to achieve the best sound quality.