Setting up the radio Alan. Setting up the radio Alan Channels holes in Alan 48 plus

Included: Midland ALAN 48 Plus transceiver, PTT control, vehicle mounting bracket, power cord with fuse, instruction manual.

Walkie talkie ALAN 48 Plus- a 400-channel civilian radio station, which has a number of additional functions that significantly increase its consumer properties.

The Midland 48 Plus transceiver has excellent sensitivity and selectivity characteristics that are stable across the entire range. By using a balanced mixer on field effect transistors and a bandpass filter at the input ensures complete suppression of side-channel interference. Precise frequency tuning and reliability are achieved by using a 400-channel frequency synthesizer.

Radio station ALAN 48 Plus This is an electronic device with modern circuitry, assembled from the best components on a durable printed circuit board and is designed for many years of reliable, trouble-free operation. The backlit keyboard allows you to work with the radio in complete darkness.

Features of the Midland Alan 48 Plus radio:

Backlit multifunction display
Keyboard backlight
Compact microphone with channel switching (UP/DOWN)
Six-pin microphone connector
External speaker connector
Connector for connecting an external device for measuring signal level

Additional control functions of Midland ALAN 48 Plus:

Memory 5 channels (M1...M5)
Turning on emergency channel 9 (EMG)
Quick channel selection (Q.UP/Q.DOWN)
Turning on the loudspeaker (CB/RA)
Atmospheric noise suppression (ANL/OFF)
Receiver sensitivity step adjustment (LOCAL/DX)
Continuous sensitivity adjustment (RF GAIN)
Adjusting the microphone gain (MIC GAIN)
Switching amplitude and frequency modulation (AM/FM)
Scanning (SCAN)

Technical characteristics of the radio station Midland Alan 48 Plus

frequency range: 26.965 - 27.405 MHz
Number of channels: 400 AM, 400 FM
The method for setting frequency channels is synchronous-phase automatic frequency control
Operating temperature range -10 / +55 C
Operating voltage 13.2 V constant +/- 15%
Dimensions: 50x154x175 mm
Weight 1 kg

ALAN 48 Plus receiver:

(Superheterodyne, double frequency conversion)
Intermediate frequencies
first - 10.695 MHz second - 455 KHz
Sensitivity
0.5 mV for 20 dB S/N in FM
0.5 mV for 20 dB S/N in AM
Sound output power at 10% harmonics 2.0 W at 8 ohms
THD less than 8% at 1 kHz
Image selectivity 65 dB
Adjacent channel selectivity 65 dB
Signal to Noise Ratio 45 dB
Current consumption in standby mode 250 mA

ALAN 48 Plus transmitter:

Output power 4 W at 13.2 V direct current
AM modulation depth: 85% to 95%
Maximum FM frequency deviation: 1.8 KHz +/- 0.2 KHz
Audio frequency range 400 Hz to 2.5 KHz
RF output impedance 50 ohm unbalanced
Signal to Noise Ratio Minimum 40 dB
Transmission current consumption 1100 mA

Citizen Band- CB (civil band). This is the most accessible frequency range, which is used to organize operational radio communications between dispatch services, vehicles and portable stations.

Using Midland ALAN 48 Plus car radios, you will be able to more clearly organize and plan the movement of enterprise vehicles, quickly transmit important information for various services. With ALAN 48 Plus radios, your vehicle will always be within reach, and you will be able to quickly control it. The maximum possible communication range is up to 50 km. Midland 48 Plus radios are designed on the basis of high technology, are easy to use and allow you to establish optimal communication quality.

You can buy Midland Alan 48 Plus radios by calling the numbers listed below.

Radio station Alan 48 Plus

The Alan 48 Plus radio station is a popular transceiver from the Midland corporation with a wide range of convenient functions, designed to provide communication between CB correspondents on the 27 MHz frequency range. It has been produced for quite a long time and has managed to win many fans among radio amateurs, thanks to its reliability and simplicity. This model has wide functionality and the ability to configure various operating parameters and is suitable for both basic and automotive use.

Appearance of Midland Alan 48+

The Alan 48 Plus radio station is designed as a standard candy bar. The case is closed with two metal covers, which are securely attached to the frame with screws on the side and back. The Midland logo is printed on the top cover. The speaker is located on the bottom of the radio and has loud and clear sound.

The front panel of the walkie-talkie is made of dark gray plastic, it houses all the controls, a multifunctional liquid crystal display, as well as a microphone connector.

On the rear panel there are connectors:

— ANTENNA - to connect external antenna;

— S— METER for connecting an external signal meter (for accurate measurement of the received signal level);

— EXT for connecting an external speaker;

— PA to use an external speaker;

There is also a plate installed here that indicates the serial number, model, manufacturer and country of origin of the radio station and the power wires equipped with a fuse come out. To quickly disconnect the radio from the on-board network, there is a plug on the wire.

Internal organization

The station is assembled using modern SMDcomponents, which are placed on a printed circuit board made of green PCB. The soldering is high-quality and reliable, there are no flux or paraffin deposits. The Alan 48 Plus uses a superheterodyne receiver with double frequency conversion.

Photo Radio station ALAN 48 Plus

Display It has good contrast, bright amber backlighting and is perfectly readable at any time of the day and from different angles. It displays the following indicators:

— working channel number 1-40 ;

— a scale with the level of the received or transmitted signal;

— selected modulation type A.M./ FM;

— reception/transmission mode RX/ TX;

— channel scanning mode Scan;

- working frequency grid A… L;

— frequency standard indicator 0/5 (Russia/Europe);

- included " emergency" channel 9;

— channels stored in the radio’s memory (M1..., M5);

Alan 48 Plus Midland Controls

The Alan 48 Plus radio has simple and easy-to-remember controls, thanks to the fact that the manipulators and buttons are grouped on the panel according to the relevance of their use.

Channel switching is done using a potentiometer CHANNEL – it has a clear, fixed stroke, without any backlash. The switch handle has small notches to prevent slipping in the user's fingers when switching.

In two oval niches located under the display, there are 4 regulators:

—ON/ OFFVOL— turn on/off the station and adjust the speaker volume;

— SQUELCH– regulates the operation of the threshold noise suppressor;

— RFGAIN– using this potentiometer you can adjust the sensitivity of the radio receiver;

— MICGAIN– allows you to adjust the microphone gain to transmit the most natural voice message on the air, cutting off external noise around the correspondent;

The regulators move smoothly, with linear force. Just like on the channel switch, each knob has small notches around its circumference.

Next to the display there are buttons responsible for working with the station memory (M1…M5), red key EMG to quickly switch to the emergency channel.

Buttons Q. U.P. And Q. DOWN oblong in shape, they quickly switch channels across station grids.

Two large oval buttons switch modulation modes A.M./ FM and turn on scan mode SCAN.

All buttons are backlit.

Thanks to convenient vertical switches, the user can switch the station’s operating mode on air or in “megaphone” mode (NE/RA), control the operation of the impulse noise filter (ANL) and quickly turn on the low-sensitivity mode of the radio receiver (LOCAL/ DX) The latter function can be especially useful when communicating between correspondents at close range, for example, while moving in a convoy or when receiving powerful signals.

Tangent

It is small in size and fits comfortably in the hand. It is connected to the station with a twisted wire with strong and elastic insulation, which does not harden or crack when used in low temperature conditions. The microphone is of the electret type. The connection connector is 6-pin; it is firmly attached to the radio thanks to a threaded connection. On the body of the vbrhjajyf there is a button to go on air PTT, as well as buttons for switching channels up U.P. and down DN.

Technical characteristics of the radio stationAlan48 PLUS

Trademark	Alan
Frequency range	26.960 - 27.405 MHz
Number of channels	80 (40AM/40FM)
Transmitter output power	4 W - 10 W
Receiver sensitivity	0.5 µV at 20 dB SINAD in FM mode 0.5 µV at 20 dB SINAD in AM mode
Squelch type	Adjustable, threshold
Types of modulation	AM/FM
Consumption current	0.3-1.1 A in standby/transmit mode
Type of connector for antenna on r/st.	SO 239 (UHF-female)
Operating voltage	13.8 V
Speaker sound power	2 W
Operating temperature range	from -10 to +55 °С
Block Dimensions	150 x 50 x 180 mm
Weight	1000 g
Type	automobile, stationary
Manufacturer	Midland

Radio station capabilitiesAlan 48 Plus

Five channels of non-volatile memory;
Multifunctional backlit LCD display;
Two types of AM/FM modulation;
Function P A(Public Address - public address in megaphone mode, with an external speaker connected);
Surge limiter ANL;
Stepwise adjustment of receiver sensitivity;
Built-in channel scanner;
Adjusting microphone sensitivity;
Possibility of connecting an accurate S-meter;
Quick transition to emergency service channel;

Advantages of the radio stationAlan 48 PLUS

High-quality signal reception and transmission.

A large set of adjustments and settings will satisfy the wishes of any, even the most advanced user.

The housing of the radio station and push-to-talk switch is designed for long-term operation.

The presence of a megaphone function makes the station useful for excursions, speakerphone driver and other road users.

To quickly navigate through private networks, special buttons are installed to change channels by 10 units with one click.

Radio station equipmentAlan 48 +

Radio station unit with a cable for powering the radio station from a 12 V DC network with a fuse;

Push-to-talk switch on a twisted cable with a connector;

Bracket for fastening the radio station;

Microphone mount;

Mounting kit of screws and self-tapping screws;

Instructions in Russian.

In conclusion, I would like to note that the improved radio station Alan 48 Plus has deservedly gained popularity among radio enthusiasts. Wide functionality of adjustments, the presence of memory registers, multi-standard firmware for different countries, a built-in impulse noise filter, phase-locked loop, a sensitive receiver, and an adjustable noise suppressor allow you to use the station both in urban mode and on the highway.

Traditionally, Midland stations are distinguished by their reliability and ease of operation. Thanks to the combination of classically located controls and buttons, each of which is responsible for one function, the present backlighting of the controls and the LCD display, using the Alan 48 Plus walkie-talkie is easy and convenient in any conditions. However, the most important advantage of this model is high-quality communication, which is always the main criterion when choosing a radio station.

Radio station revealRadio stationMidland 48 plus

Switching between Russian and European frequency networks.

While holding down the AM/FM + SCAN buttons, turn on the station. When you release the pressed buttons, all the symbols on the screen light up. Select the desired region using the UP/DN channel selection switch, then briefly press the PTT button and turn the station off and on.

When the display lights up letter designation the grid you have chosen along with the channel number, you can use the radio station.

For Belarus and Poland, select the PL region

Frequency bands in a radio stationMidland 48 plus

I - Italy: 40 channels AM/FM 4 W (26965-27405 MHz)

I2 - Italy: 34 channels AM/FM 4 W (26875-27265 MHz)

D - Germany: 80 channels FM 4 W and 12 channels AM 1 W

D2 - Germany: 40 channels FM 4 W and 12 channels AM 1 W

EU - Europe: 40 channels FM 4 W and 40 channels AM 1 W

EC - CEPT: 40 channels FM 4 W

E - Spain: 40 channels AM/FM 4 W

F - France: 40 channels FM 4 W and 40 channels AM 1 W

UK - England: 40 channels FM 4 W (British frequencies) + EC 40 channels FM 4 W (CEPT frequencies)

Export versions:

RU - Russia: 400 channels AM/FM 4 W (25615-30105 MHz)

P.L.– Poland: 40 channels AM/FM 4 W (26960-27400 MHz – Belarusian and Polish frequencies)

PX - Poland: 400 channels AM/FM 4 W (25610-30100 MHz - Polish frequencies)

SW - Sweden: 24 channels FM 4 W 31 MHz.

And although, on this moment, the relevance of this radio station in functional terms is very low, I decided to review it. This is still a living example of the old school of CB radio construction. Some may like it, some may not, but one thing is for sure, this station has charisma. Perhaps someone is still using the same or a modernized version with the Multi prefix and made with SMD components. This is a device from my personal collection. This station is also dear to me because it was from here that my journey into the world of CB began.
Yes, yes, this is the same radio station that I described in the “” section. Alan 48 Excel purchased in the mid-2000s and still alive. I carried out a number of operations on it to improve its characteristics and I am writing this review as some tribute to this device, which became for me a guide to the world of radio.

Appearance
The station has a classic front panel design, similar to the design of devices from the American company Uniden.

Compared to modern stations, the body is quite decent in size; it, of course, does not outperform American CBs, but it cannot be called small either.

The body is painted with black powder paint. The top cover features the Midland logo and CB TRANSCEIVER.

The front panel is made of plastic. It is quite soft and scratches easily. The front panel has a transparent insert covering the LCD display and S-meter. In this station, the S-meter is made in the form of a pointer device, which is quite convenient, since it allows you to visually monitor weak changes in the input signal.

The S-meter scale also serves as a rating scale for the radio's output power.
On the left is the channel change knob. Below it is the headset connector; it has an original shape. Such connectors are installed only on Alan-Midlands. This does not provide any advantages, but it looks aesthetically pleasing.

Under the S-meter there is a button for switching operating modes between the radio station (CB) mode and the loudspeaker mode (PA).

To the right are two indicators. One is responsible for indicating reception and transmission, the second for indicating the modulation mode.
Even further to the right is an LCD display that displays the channel number and grid. It has a pleasant amber backlight. It is only readable from the front and top, the bottom is difficult to read.

Stated characteristics
Brand: Alan
Frequency range, MHz: 25.615 - 30.105
Number of frequency channels: 400
Transmitter output power, W: 10
Sensitivity, µV (s/n): 0.5 (20 dB)
Noise suppressor type: threshold
Modulation types: AM/FM
Supply voltage, V: 13.2
Power: DC 12 Volt
Maximum current consumption, mA: 1300 mA
Antenna connector type: UHF-female (PL259-female)
Speaker sound power, mW: 2000
Operating temperature range, °C: -10 +55
Installation type: bracket
Dimensions, mm: 150x45x175
Weight, g: 1000
Country of origin: Thailand

Bottom line
As I already wrote at the beginning of the review, it is impossible to give an unambiguous assessment of this device; some may like it, others may not. One thing is for sure, the device was good for its time. Now it is already morally obsolete. Despite this, their production continues, both regular Alan 48 Excel and Alan 248 Excel on SMD with a nasty blue backlight. This says a lot, and most importantly, there is a demand for it. I don’t know what the consumer is falling for, but the stations are sold, and from time to time they appear on the secondary market, and are even sold there.

I will say this, at the moment, if you need the station for work, I would not advise you to take the Alan 48 Excel, especially the modern one. But if you like this station and you take it for the soul, I think you will not be disappointed.

Radio station Alan 48 Plus

The Alan 48 Plus radio station is a popular transceiver from the Midland corporation with a wide range of convenient functions, designed to provide communication between CB correspondents on the 27 MHz frequency range. The walkie-talkie has been in production for quite a long time and has managed to win many fans among radio amateurs, thanks to its reliability and simplicity. This model has wide functionality and the ability to configure various operating parameters and is suitable for both basic and automotive use.

Appearance

The front panel of the radio is made of dark gray plastic; all controls, a multifunctional liquid crystal display, and a connector for connecting a push-to-talk switch are located on it.

On the rear panel there are connectors:

- S- METER for connecting an external Signal meter (for accurate measurement of the level of the received signal);

- EXT for connecting an external speaker;

- PA to use an external speaker;

Internal organization

Photo Radio station ALAN 48 Plus

Display It has good contrast, bright amber backlighting and is perfectly readable at any time of the day and from different angles. It displays the following indicators:

Working channel number 1-40 ;

A scale with the level of the received or transmitted signal;

Selected modulation type A.M./ FM;

Receive/transmit mode RX/ TX;

Channel scan mode Scan;

Working frequency grid A… L;

Frequency standard indicator 0/5 (Russia/Europe);

Included " emergency" channel 9;

Channels stored in the radio's memory (M1..., M5);

Controls

The Alan 48 Plus radio has simple and easy-to-remember controls, thanks to the fact that the manipulators and buttons are grouped on the panel according to the relevance of their use.

In two oval niches located under the display, there are 4 regulators:

-ON/ OFFVOL- turn on/off the station and adjust the speaker volume;

- SQUELCH– regulates the operation of the threshold noise suppressor;

- RFGAIN– using this potentiometer you can adjust the sensitivity of the radio receiver;

- MICGAIN– allows you to adjust the microphone gain to transmit the most natural voice message on air, cutting off external noise around the correspondent;

The regulators move smoothly, with linear force. Just like on the channel switch, each knob has small notches around its circumference.

Next to the display there are buttons responsible for working with the station memory (M1…M5), red key EMG to quickly switch to the emergency channel.

Buttons Q. U.P. And Q. DOWN oblong in shape, they quickly switch channels across station grids.

Two large oval buttons switch modulation modes A.M./ FM and turn on scan mode SCAN.

All buttons are backlit.

Tangent

The radio station Alan 48 Plus has a small size and fits comfortably in the hand. It is connected to the station with a twisted wire with strong and elastic insulation, which does not harden or crack when used in low temperature conditions. The microphone is of the electret type. The connection connector is 6-pin; it is firmly attached to the radio thanks to a threaded connection. On the body of the PTT there is a button to go on air PTT, as well as buttons for switching channels up U.P. and down DN.

Technical characteristics of the radio stationAlan-48 PLUS

Trademark	Alan
Frequency range	26.960 - 27.405 MHz
Number of channels	80 (40AM/40FM)
Transmitter output power	4 W
Receiver sensitivity	0.5 µV at 20 dB SINAD in FM mode 0.5 µV at 20 dB SINAD in AM mode
Squelch type	Adjustable, threshold
Types of modulation	AM/FM
Consumption current	0.3-1.1 A in standby/transmit mode
Type of connector for antenna on r/st.	SO 239 (UHF-female)
Operating voltage	13.8 V
Speaker sound power	2 W
Operating temperature range	from -10 to +55 °С
Block Dimensions	150x50x180 mm
Weight	1000 g
Type	automobile, stationary
Products webpage	midland.ru

Radio station capabilitiesAlan 48 Plus:

Five channels of non-volatile memory;

Multifunctional backlit LCD display;

Two types of AM/FM modulation;

Function P A(Public Address - public address in megaphone mode, with an external speaker connected);

Surge limiter ANL;

Stepwise adjustment of receiver sensitivity;

Built-in channel scanner;

Adjusting microphone sensitivity;

Possibility of connecting an accurate S-meter;

A quick transition to the emergency service channel is provided;

Advantages of the radio stationAlan 48 PLUS:

High-quality signal reception and transmission.

A large set of adjustments and settings will satisfy the wishes of any, even the most advanced user.

The housing of the radio station and push-to-talk switch is designed for long-term operation.

The presence of a megaphone function makes the station useful for conducting excursions, loudspeaker communication for the driver and other road users.

To quickly navigate through private networks, special buttons are installed to change channels by 10 units with one click.

Radio station equipmentAlan 48 + :

Radio station unit with a cable for powering the radio station from a 12 V DC network with a fuse;

Push-to-talk switch on a twisted cable with a connector;

Bracket for fastening the radio station;

Microphone mount;

Mounting kit of screws and self-tapping screws;

Instructions in Russian.

Radio station revealRadio stationMidland 48 plus

Switching between Russian and European frequency networks.

When the letter designation of the grid you have selected along with the channel number lights up on the display, you can use the radio station.

For Belarus and Poland, select the PL region

Frequency bands in a radio stationMidland 48 plus

I - Italy: 40 channels AM/FM 4 W (26965-27405 MHz)

I2 - Italy: 34 channels AM/FM 4 W (26875-27265 MHz)

D - Germany: 80 channels FM 4 W and 12 channels AM 1 W

D2 - Germany: 40 channels FM 4 W and 12 channels AM 1 W

EU - Europe: 40 channels FM 4 W and 40 channels AM 1 W

EC - CEPT: 40 channels FM 4 W

E - Spain: 40 channels AM/FM 4 W

F - France: 40 channels FM 4 W and 40 channels AM 1 W

UK - England: 40 channels FM 4 W (British frequencies) + EC 40 channels FM 4 W (CEPT frequencies)

Export versions:

RU - Russia: 400 channels AM/FM 4 W (25615-30105 MHz)

P.L.- Poland: 40 channels AM/FM 4 W (26960-27400 MHz – Belarusian and Polish frequencies)

PX - Poland: 400 channels AM/FM 4 W (25610-30100 MHz - Polish frequencies)

SW - Sweden: 24 channels FM 4 W 31 MHz.

And although, at the moment, the relevance of this radio station in functional terms is very low, I decided to review it. This is still a living example of the old school of CB radio construction. Some may like it, some may not, but one thing is for sure, this station has charisma. Perhaps someone is still using the same or a modernized version with the Multi prefix and made with SMD components. This is a device from my personal collection. This station is also dear to me because it was from here that my journey into the world of CB began.
Yes, yes, this is the same radio station that I described in the “” section. Alan 48 Excel purchased in the mid-2000s and still alive. I carried out a number of operations on it to improve its characteristics and I am writing this review as some tribute to this device, which became for me a guide to the world of radio.

Appearance
The station has a classic front panel design, similar to the design of devices from the American company Uniden.

Compared to modern stations, the body is quite decent in size; it, of course, does not outperform American CBs, but it cannot be called small either.

The body is painted with black powder paint. The top cover features the Midland logo and CB TRANSCEIVER.

The front panel is made of plastic. It is quite soft and scratches easily. The front panel has a transparent insert covering the LCD display and S-meter. In this station, the S-meter is made in the form of a pointer device, which is quite convenient, since it allows you to visually monitor weak changes in the input signal.

The S-meter scale also serves as a rating scale for the radio's output power.
On the left is the channel change knob. Below it is the headset connector; it has an original shape. Such connectors are installed only on Alan-Midlands. This does not provide any advantages, but it looks aesthetically pleasing.

Under the S-meter there is a button for switching operating modes between the radio station (CB) mode and the loudspeaker mode (PA).

To the right are two indicators. One is responsible for indicating reception and transmission, the second for indicating the modulation mode.
Even further to the right is an LCD display that displays the channel number and grid. It has a pleasant amber backlight. It is only readable from the front and top, the bottom is difficult to read.

Below the display and S-meter are control buttons. They are also highlighted and I will talk about them in the functions section.
On the right edge there are 2 double handles. On top there is volume control and noise reduction control. Below is the microphone gain and receiver sensitivity adjustment.

The handles, like the display, have amber backlighting around the perimeter, like BMW's angel eyes. The backlight is not bright. This is convenient and makes searching in the dark easier.

The headset is small and light, it gets lost in the hand, which is not very good. However, it is quite reliable and works well.

On the rear panel there is a marking plate with serial number. Antenna connector. Socket for connecting an external S-meter.

External speaker jack (PA) and external speaker jack (CB). The power cord has a quick disconnect connector, which is a plus.

Functions
The station has 10 grids from A to L. Each grid has 40 channels. Total 400 channels. Channels and grids are displayed on the LCD display. There are also 2 types of modulations AM/FM. The modulation is switched with the button labeled M4 (AM/FM). You can judge which mode is enabled by the color of the right LED under the S-meter. Red – FM, green – AM. The transmit-receive mode is also displayed on the LED next to it. The principle is the same. Red – transmit, green – receive.

The S-meter has two scales. The top one shows the signal strength in points, from 0 to 9+30. This is typical for civil band stations.

The CB/PA button turns off the radio and turns on the external speaker under the hood of your car, if you have one installed and connected to the PA jack on the rear of the radio.

Radio control buttons

FUNC button - allows you to record channels into memory. A total of 5 channels are available for recording. To memorize a channel, press the FUNC button and press and hold any button with the letter M*. This way the channel will be recorded in memory. You can recall a channel from memory in the same way by pressing the FUNC button and briefly pressing the desired M* button.
Button – EMG. Switches the station to emergency channels 9 and 19.
Button – DW. Enables dual channel listening mode.
Button – SCAN. Enables channel scanning mode.
Button – AM/FM. Switches modulation. The modulation indication is described above.
Button – Lock. Includes keypad lock and channel knobs.
Button – N.K. Enables Noise Killer mode. It works strangely, in fact, it cuts off high frequencies distinguishing the voice from the noise.

Adjustment knobs
They are on the right. On top there is a volume control knob, it is inside, and a noise reduction control knob is on the outside. There is only one of him in this station. At the bottom there is a microphone gain control knob, inside, and a receiver gain control knob, outside.

Inside
The station is made on a printed circuit board made of yellow PCB. This old version built on output components.

SMD is used here only on a separate ESP (Noise Killer) board.

The VCO, like all Alans, is traditionally filled with paraffin. This is the weak point of the station.

Paraffin is designed to bind the parts and protect them from chatter, but in practice, it turns out that the coefficient of thermal expansion of the paraffin and solder with which the parts are sealed is different, and with temperature changes, the paraffin slowly loosens and pulls the components out of the board, destroying the soldering. You need to remember this if you suddenly lose reception or transmission. Look at the VCO first. The output stage is built on bipolar transistors 2SC2314 and 2SC1969. They are covered with a screen. The latter are now a problem to get, but if you still manage to burn them, then they can be easily replaced with 2SC2078 without any modifications or loss of power. Otherwise, there is nothing particularly noteworthy inside the station; it is built according to a classical design, and if you close your eyes to some shortcomings, with careful operation, it is quite reliable.

Modifications
About improvements to Alan 48 Excel.

Good luck to everyone, 55, 73!

Technical characteristics of a car CB radio station (walkie-talkie) Alan 48 plus. Frequency range: 26.965 - 27.405 MHz
Number of channels: 400 AM, 400 FM

Truck drivers constantly use 27 MHz cb radios in their work. Historically, in all countries of the world they communicate on one specific channel. This walkie-talkie can be used as such walkie-talkies for truckers. And since these walkie-talkies have a large number of channels (400), they are very often used as walkie-talkies for taxis.

Trucker frequency - 27,135 MHz . The Alan 48 plus radio supports this frequency.
It corresponds to grid C, channel 15.
Method for setting frequency channels: synchronous-phase automatic control

Operating temperature range: -10 / +55 C
Operating voltage: 13.2V DC +/- 15%
Dimensions: 180 x 50 x 150 mm
Weight: 1 kg

Alan 48 radio receiver

(Superheterodyne, double frequency conversion)
Intermediate frequencies:
first - 10.695 MHz, second - 455 KHz
Sensitivity
0.5 mV for 20 dB S/N in FM
0.5 mV for 20 dB S/N in AM

Alan 48 walkie talkie transmitter

Walkie Talkie Audio Output Power Alan 48 at 10% harmonics: 2.0 W at 8 ohms
Total Harmonic Distortion: Less than 8% at 1KHz
Image selectivity: 65 dB
Adjacent channel selectivity: 65 dB
Signal to Noise Ratio: 45 dB
Current consumption in standby mode: 250 mA
AM modulation depth: 85% to 95%
Maximum FM frequency deviation: 1.8 KHz +/- 0.2 KHz
Audio frequency range: 400 Hz to 2.5 KHz
Output Impedance: RF 50 ohm unbalanced
Signal to Noise Ratio: Minimum 40 B
Transmission current consumption: 1100 mA

The radio has been around for a very long time, more than 10 years.

In the car she was replaced by 78+, I was amazed by the sound of the speaker - completely deaf, I was upset. I drove it for a while and changed it back to 78+. Then somewhere I found information on how to change the sound of the speaker. The operation was completed and the station settled in the car.

The lack of memory really bothered me because... The meaning of the buttons of the memory cells is lost, every time you have to set everything up again, you stopped at a tent/store to buy water and everything went off again, turned it off and on, everything went off. As a result, improvements were made:
1. Power supply - capacitors C434, C702 were thrown out, a 1000F 5.5V ionistor was installed. It lasts for more than a week for sure, perhaps more, but there was simply no downtime.
2. Zeros and fives were made by the seller by switching the processor (press the PTT button and turn on the station there will be zeros). But I made the memory of pp.1 i.e. It turns out that switching will not work, but a solution was found quickly. We cut/unsolder the jumpers from the ANL switch and connect the ground to it on one contact and the 68th leg of the processor on the second. As a result, in one position of the switch the memory is saved, in the second the processor starts with a reset and, polling the state, turns on the desired mode. I note that when you start with a reset, all memory is erased :(.
3. They rarely complained about modulation, but they changed it anyway. I removed C456 and soldered a 4700pF capacitor between legs 1 and 5 of IC104
4. I switched the SCAN button to scanning memory cells, this is more useful to me.
5. I connected the signal for voicing the keys and turning the encoder, the signal from leg 7 of the processor through a 220K resistor and a 0.01 mF capacitor was applied to the ULF input (pin 5 of IC103). But this is for me and the fact that the station is in the car. If for home use, then you need to apply it to the upper (according to the diagram) output of the volume control. Then the volume of the signal will change depending on its position, for the car it was not relevant for me, or rather, it was even relevant for the beep to be as loud as possible.

By the way, the memory there should generally be supported without modifications, if the station is constantly connected to power, the processor is fed bypassing the switch. Does not work due to a sharp jump in current consumption at the moment of switching off, i.e. Something was not thought through; in a simple version, it is enough to install a larger capacitor. I tried it at 500mF and it held the memory for about 10 minutes, although the capacitor was some kind of ancient, it is possible that its self-discharge current was greater than the current required to maintain the processor memory :).

Among the shortcomings of my copy - very high level signal at the ULF input, it is unrealistic to use the station at a volume higher than the 14 o'clock position of the control, it screams loudly and there is too much distortion, it is possible to make out what they are saying, but it is very difficult. So far I have not dealt with this problem. Yes, and improvements in large quantities I got busy recently. The main thing was the drone of the speaker.

Pros:
- Adjusting sensitivity, it can be very useful.
- Quite good sensitivity, whoever complains try it on different antennas, I checked, there are very significant differences.
- Good volume (even too much).
- Availability of memory cells.
- After modification, scanning through memory cells.
- Height 1DIN.
- Possibility of some increase in power, but I don’t need it, I have something to increase it :) .
- Captures the 10 meter range.

Minuses:
- Threshold noise reduction.
- Ergonomics, I would tear off the hands of whoever came up with this. The volume control next to the massive PTT connector is very inconvenient to turn, and there is also a channel switching wheel (valcoder). That is, those things that are needed most often are hidden most of all, although they seem to be in plain sight.
- The height is 1DIN, but the width is not, i.e. Stupidly inserting it into a single-din place will not work.
- The depth of the station is very deep, in a couple of cars I could barely get it in, and then with the help of files and other similar things - it didn’t fit. Another thing is that it’s still 1DIN in height - it’s easier to fit it in than something that doesn’t fit the size at all.

In general, if they offered me the same thing now with automatic (spectral) noise reduction, then I wouldn’t need anything else. Although no, the AM-FM modulation would be stored in the cells, then you definitely don’t need anything else.

So, in my opinion, the station is quite balanced in terms of functionality and quality, both for the car and as a base station. For reception, it works a little better for me than ALAN 78+, although this is already faintly perceptible. I compared it with some other stations of the same class - I didn’t see any difference. The comparison was between megajets and yosans.

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