How important is it to have a walkie-talkie outdoors? Do you know these radio common sense?

In many industries today, walkie-talkies have become a common communication tool. Walkie-talkies are widely used in various occasions, so we should have a deeper understanding of this knowledge. When traveling, many people also use walkie-talkies. Next, let's learn about the selection of outdoor walkie-talkies, which is important knowledge we must understand.

Walkie-talkies are emergency communication devices and a type of radio equipment. Amateur radio enthusiasts need to hold a license and international call sign.

All amateurs in the world are called "Jia", which is a name used by radio enthusiasts, called "HAM" in English and "Ham" in Chinese. Amateurs who have not obtained formal call signs and radio licenses are usually called "sausages".

Outdoors, the most common use is the handheld walkie-talkie with analog signals. Therefore, this article will focus on the relationship between handheld walkie-talkies and outdoor sports.

Common frequency divisions for walkie-talkies:

In China, walkie-talkie frequencies are divided according to the regulations of the Radio Management Committee, mainly into the following ranges:

Professional walkie-talkie: V-band (136-174MHZ) and U-band (400-470MHZ)

Armed police use frequency: 350-390MHZ

Coast communication frequency: 220MHZ

Traffic light monitoring and air defense sirens frequency: 223.025-235MHZ

Amateur walkie-talkie frequency: 433MHZ

Cluster communication frequency: 800MHZ

Mobile phone communication frequency: 900MHZ/180MHZ

When choosing a walkie-talkie, understanding these frequency divisions helps ensure that the equipment is used legally within the scope of regulations. At the same time, choose a walkie-talkie with the corresponding frequency band according to actual needs to ensure communication effectiveness and compliance.

Basic knowledge of using walkie-talkie

Walkie-talkies are a common communication tool. Depending on their uses and nature, they can be divided into three types: professional, civilian and license-free.

1. Professional machine:

Transmitting power range: 0.3-5W, adjustable.

Features: strong, durable, long battery standby time, large size.

Scope of use: Professional machines usually work within a professional frequency range and basically cannot be moved at will. They are suitable for outdoor, harsh environments, and team use.

Function: The internal functions are powerful and can realize networking, group calls, digital communication, ID recognition, air remote closing and other functions.

2. Civilian aircraft:

Transmitting power range: 0.3-5W, power adjustable.

Features: It has powerful external functions, has the functions of a professional machine, and has more auxiliary functions, and can be used as a radio.

Scope of use: Can transmit and receive within the amateur frequency range of 150MHZ and 400MHZ.

Function: With rich auxiliary functions and compact size, it is loved by amateur radio enthusiasts all over the world.

3. License-free machine:

Frequency: 20 frequencies with 409MHZ as the main frequency are opened as license-free frequencies.

Features: No application is required to use this frequency and it can be used at will, but the transmission power is strictly limited and must not exceed 0.5W.

Scope of use: Applicable to situations where no special license is required, but power restrictions must still be followed.

Note: There are regulations on the use of radio frequencies and illegal use may result in penalties.

When choosing a walkie-talkie, you need to make a reasonable purchase based on actual needs and usage environment to ensure that it can meet communication needs in different situations. At the same time, you need to understand the legal use and regulations of the frequency to avoid problems caused by illegal use.

Intercom communication distance concept analysis

The communication distance of a two-way radio is not a simple number, and the common question of "how far is it" often involves some misunderstandings. The following is an explanation of the concept of two-way radio communication distance:

Frequency and Line-of-Sight Propagation:

The frequencies used by walkie-talkies are line-of-sight, which means that the communication range is limited to the straight line of sight. Under ideal conditions, walkie-talkies can communicate as long as the eye can see.

Power and Antenna:

The transmission power and antenna quality will affect the communication distance. Generally speaking, higher power and better antennas will increase the communication range.

Terrain and obstacles:

Terrain and obstacles can affect the transmission of radio signals. In flat areas, the communication distance may be longer; in cities or areas with a lot of obstacles, the communication distance may be shorter.

Actual communication distance:

The actual communication distance is often affected by many factors, including equipment quality, environmental conditions, electromagnetic interference, etc. Therefore, walkie-talkie manufacturers usually provide a "theoretical maximum distance", but the actual distance in use may be different.

Safety and convenience:

The use of walkie-talkies in outdoor activities focuses more on safety and convenience. Compared with mobile phones, walkie-talkies are more suitable for activities such as hiking, trekking, and self-driving because of their instant communication and simple operation without dialing or looking up contacts.

In general, the communication distance of a walkie-talkie should not be simply understood as a static value, but a dynamic concept affected by many factors. When selecting and using a walkie-talkie, actual needs, environmental conditions, and device characteristics should be considered comprehensively to ensure stable and reliable communication.

Four benefits of walkie-talkies

Using intercoms for internal communications within organizations and teams has many benefits. Here are four key advantages:

1. Convenience:

The intercom frequencies within the organization are consistent, enabling one person to talk to multiple people. When any intercom initiates a call, other intercoms can quickly receive the message, enabling fast communication within the group.

2. Quick:

Intercoms provide a quick way to disseminate information, which helps organize internal command and dispatch. Through intercoms, team members can respond and execute tasks quickly, achieve close internal connections, and improve work efficiency.

3. Economy:

Intercom communication does not require additional call charges, which is particularly suitable for scenarios where internal calls are frequent. Compared with mobile phones, the use of intercoms can reduce communication costs and save organizational expenses.

4. Freedom:

Walkie-talkies do not rely on network support and can be used to talk freely at any time and any place by pressing buttons. Walkie-talkies play a big role in scenes such as out-of-town, suburban, travel or engineering operations, especially in environments without network coverage. Compared with mobile phones, walkie-talkies are more autonomous and independent.

Compared with mobile phones, walkie-talkies have certain advantages in communication reliability, flexibility and cost. Especially in work scenarios that require fast and centralized command, walkie-talkies become a more suitable communication tool.

The Importance of Handheld Walkie-Talkies in Group Travel

In group travel, especially when there are a large number of people, handheld walkie-talkies become an essential communication tool. Their importance is reflected in many aspects:

1. Real-time information transmission:

The team leader can use a handheld walkie-talkie to broadcast road conditions and provide navigation instructions in real time, so that the entire team can quickly obtain the latest information and ensure that everyone can move forward in an orderly manner.

2. Efficient coordination and discussion:

When you need to take a break, discuss your schedule, or deal with an emergency, you can quickly coordinate and discuss within the team through a walkie-talkie. Compared to making phone calls one by one, a handheld walkie-talkie is more convenient and faster.

3. Unified communication system:

Intercoms build a unified communication system, making information transmission within the team more efficient. Lack of a unified radio system is like losing eyes and ears. Intercoms have become an indispensable tool for team communication.

4. Emergency Rescue:

In deep mountains and forests, where mobile phone signals are unstable, walkie-talkies become an important rescue tool. Use walkie-talkies to send distress messages, use local amateur relay stations, seek help from HAM, and achieve emergency rescue.

Overall, handheld walkie-talkies play a key role in team travel, providing convenience and security for team collaboration and safe and orderly progress.

Many times when you can't find the way, you can go to the repeater station to ask for directions, and the hams around will help you tell you the way.

Precautions for using walkie-talkies

When using a walkie-talkie, in order to ensure communication effectiveness and user safety, you need to pay attention to the following matters:

1. Launching posture and distance:

When the walkie-talkie is transmitting, keep the walkie-talkie in a vertical position and ensure that the distance between the microphone and the mouth is between 2.5-5 cm. When transmitting, keep the walkie-talkie at least 2.5 cm away from the head or body to prevent the impact of radiation on the body.

2. Power on/off operation:

During use, turn the phone on and off correctly. At the same time, adjust the volume to a level suitable for hearing to ensure a clear call experience.

3. Frequency selection considerations:

Be careful when using the 200-240Mhz walkie-talkie frequency, as this frequency band may be affected by jammers. Pay special attention to the public security frequency band between 300-400Mhz to avoid interfering with the communications of relevant departments.

4. Relay station help:

When you can't find the way or need help, you can ask for help from the surrounding HAMs through the repeater on the walkie-talkie. HAMs usually provide route guidance and help solve problems.

5. Factors affecting intercom communication distance:

The call distance of a walkie-talkie is affected by many factors, including terrain, buildings, electromagnetic interference, etc. When choosing the communication frequency and the use environment, these factors should be considered to obtain better call results.

In general, correct usage methods and precautions can ensure the safe and effective use of walkie-talkies and ensure smooth communication.

Factors affecting the communication distance of walkie-talkies

When using a walkie-talkie, the communication distance is affected by a number of factors, which can be divided into different categories:

1. System parameters:

Transmitter output power: The stronger the output power, the wider the transmission signal coverage and the longer the communication distance. However, too high a transmission power can lead to problems such as increased battery consumption, increased interference, and radiation pollution.

Receive sensitivity: The higher the receive sensitivity, the longer the communication distance because it can better capture weak signals.

2. Environmental factors:

Paths, tree density: Terrain and vegetation density can affect signal propagation and hinder signal coverage.

Electromagnetic interference: Electromagnetic interference in the surrounding environment will affect signal quality and reduce communication distance.

Buildings: Large buildings may block the signal and reduce the communication range.

Weather conditions: Severe weather conditions, such as rain, snow, thunderstorms, etc., can also affect signal propagation.

3. Other influencing factors:

Battery level: When the battery level is sufficient, call quality is good. Low battery may cause call quality degradation and noise.

Antenna matching: The frequency band of the antenna must match the frequency band of the machine. Mismatch will seriously affect the call distance.

4. Sound quality:

The sound quality depends on parameters such as pre-emphasis and de-emphasis circuits. Advanced voice processing circuits and compression and expansion circuits can improve the sound quality and clarity of calls.

In general, to achieve better walkie-talkie communication effects, these factors need to be considered comprehensively and corresponding adjustments made in actual use.