The traditional analog walkie-talkie is a communication mode in which voice, signaling, and signals are modulated onto the carrier frequency of the walkie-talkie in a continuous wave manner, and optimized processing such as amplification. It has the advantages of mature technology, complete system and relatively low cost.

The digital walkie-talkie is a digital communication mode that digitizes the voice signal, uses a specific digital encoding method and a specific baseband modulation form, and uses a digital signal processor for optimization.

The digital walkie-talkie is a digital communication mode that digitizes the voice signal, uses a specific digital encoding method and a specific baseband modulation form, and uses a digital signal processor for optimization.

The first is to make better use of spectrum resources. Similar to cellular digital technology, digital walkie-talkies can load more users on a designated channel and increase spectrum utilization. This is a solution to frequency congestion.

The second is to improve the call quality. Because digital communication technology has an error correction function in the system, compared with analog walkie-talkies, it can achieve better voice and audio quality in a wider range of signal environments, and it will receive less audio noise and more sound. Clear.

The last point is to improve and improve the integration of voice and data, and to change the weakness of the control signal that decreases as the communication distance increases. Compared with similar integrated analog voice and data systems, digital walkie-talkies can provide better data processing and interface functions, so that more data applications can be integrated into the same two-way wireless communication base station structure, providing voice and data services The integration is more complete and more convenient.

Compared with traditional analog walkie-talkies, it has strong voice anti-interference ability, high confidentiality, narrower channel bandwidth, and stronger data transmission ability.

Many customers want to know what walkie-talkie has the farthest call range. Let's talk about it today. Walkie-talkies are divided into analog walkie-talkies, digital walkie-talkies and poc walkie-talkies. For analog walkie-talkies and digital walkie-talkies, the distance of the call depends on the power of the walkie-talkie, the antenna, and the conditions of the surrounding environment. The distance of the analog car-mounted walkie-talkie is generally better than that of the handheld walkie-talkie. The poc walkie-talkie uses wifi or sim card, which is similar to a mobile phone. As long as there is a wifi signal or an operator signal, you can talk. Therefore, the poc walkie-talkie can realize a nationwide call or even a global call. Therefore, the voice range of the poc walkie-talkie is the farthest.This Q8 is such a PoC walkie talkie.

What is mobile radio? What’s the difference between handheld walkie talkie ( handheld radio) and mobile radio? Let’s see what their differences.

A sales person or radio repair shop would understand the word mobile to mean vehicle-mounted: a transmitter-receiver (transceiver) used for radio communications from a vehicle. ( From Wikipedia ).

Output:

Handheld radio: Normally the output is less then 5 watts, talk range is short.

Mobile radio: The output range from 15 to 100 watts, talk range is longer then handheld radio.

Power supply:

Handheld radio: Battery power supply. The radio normally can change the replacement battery easily.

Mobile radio: Use Household Power Supply ( need Transformer ) or Cigarette Lighter power supply ( QYT KT-8900 series radio use cigarette lighter power supply ).

Installation location:

Handheld radio: Put in walkie talkie case, easy to carry

Mobile radio: Need a fixed place in car or home, need the power cable

Team use:

Handheld radio: Suit for short distance, when user moving fast, the signal maybe worse then standing

Mobile radio: Talk range is longer, when the vehicle moving it works better then handheld radio

Price:

Handheld radio: The price is lower then mobile radio, normally the price is several to dozens dollars

Mobile radio: Generally the mobile radio cost is higher than handheld radio. Usually the price is tens to hundreds of dollars

Misunderstanding:

1. Don’t use the handheld radio connect to the cigarette lighter as mobile radio. In this way, the machine is very easy to be damaged.

2. Don't blindly seek the limit. The maximum output power of the radio is 100W. You should not use it always on 100 watts. Although it can be used normally, it also causes damage to the radio.

Walkie talkies are essential communication devices in many industries and recreational activities. However, their performance can be significantly influenced by various weather conditions. Understanding these effects can help users optimize their communication strategies in different environments.

Rain and Humidity
Rain and high humidity can have a noticeable impact on walkie talkie signals:

Signal Attenuation: Water droplets in the air can absorb and scatter radio waves, reducing signal strength.

Reduced Range: In heavy rain, the effective communication range of long range walkie talkies may decrease.

Interference: Raindrops hitting antennas can create static noise.

Mitigation: Use waterproof devices and consider higher power settings in rainy conditions. For better performance, especially in challenging weather, opting for high power walkie talkies can significantly enhance communication clarity.

Fog and Mist
Fog and mist, while less impactful than rain, can still affect signal propagation:

Slight Signal Absorption: Water particles in fog can absorb some of the radio waves.

Minimal Range Reduction: The effect is usually less severe than rain.
Mitigation: Generally, standard operating procedures are sufficient in foggy conditions.

Snow and Ice
Snow and ice can have varying effects:

Signal Reflection: Snow can sometimes reflect radio waves, potentially extending range in some directions.

Antenna Icing: Ice buildup on antennas can detune them, affecting performance.

Cold Battery Issues: Extreme cold can reduce battery life and efficiency.

Mitigation: Keep batteries warm and ensure antennas are free of ice buildup.

Wind
Wind itself doesn't directly affect radio waves, but it can indirectly impact communication:

Antenna Movement: Strong winds can move antennas, affecting signal consistency.

Background Noise: Wind can create noise when blowing across microphones.

Mitigation: Use wind shields on microphones and ensure antennas are securely fastened.

Temperature and Pressure Changes
Extreme temperatures and pressure variations can affect walkie talkie performance:

Thermal Expansion/Contraction: Can affect electronic components.

Pressure Changes: May impact the ionosphere, affecting long-range communications.

Mitigation: Use devices rated for extreme temperatures when necessary.

Lightning and Thunderstorms
Thunderstorms pose significant challenges:

Electromagnetic Interference: Lightning can cause severe radio interference.

Safety Concerns: Using walkie talkies in thunderstorms can be dangerous.

Mitigation: Avoid using walkie talkies during thunderstorms for safety reasons.

Clear Skies and Optimal Conditions
Ideal weather for walkie talkie use:

Maximum Range: Clear, dry conditions often allow for the best signal propagation.

Minimal Interference: Less atmospheric moisture means clearer signals.

Weather conditions play a crucial role in walkie talkie performance. Rain, snow, and extreme temperatures can all affect signal strength and clarity. Users should be aware of these factors and adjust their usage accordingly. In critical operations, having backup communication methods or higher-powered devices, like professional grade walkie talkies, can be beneficial. Regular maintenance and proper storage of walkie talkies can also help mitigate weather-related issues, ensuring reliable communication in various environmental conditions, especially when utilizing high power walkie talkies for enhanced reliability.

Walkie talkies, also known as two-way radios, remain one of the most reliable communication tools in situations where cellular networks and internet connections aren't available. One key feature of walkie talkies that often gets overlooked is the number of channels they support. But why is the number of channels important, and how does it affect your choice of device? Let’s explore this critical aspect in more detail.

How Many Channels Do Most Walkie Talkies Have?

Most consumer-grade walkie talkies typically support 22 channels, especially in countries like the U.S. where radios operate on the FRS (Family Radio Service) and GMRS (General Mobile Radio Service) frequencies. However, professional or commercial-grade walkie talkies, such as those offered by QYT Electronics Co., Ltd., may support hundreds or even thousands of channels. These advanced models are often programmable, allowing users to customize channels to specific frequencies or communication needs.

Why Does the Number of Channels Matter?

The number of channels supported by a walkie talkie determines how flexible and interference-free your communication can be. Here's why it matters:

Avoiding Channel Overlap: With more channels, you have a better chance of avoiding interference from other users in crowded areas, such as events, construction sites, or urban settings. For example, a device with 16 or fewer channels may experience congestion, while a walkie talkie supporting 50+ channels offers more options for clear communication.

Custom Use Cases: For professionals, such as security teams or emergency responders, having access to dedicated channels is crucial. Businesses may assign specific channels for teams working on different tasks, ensuring privacy and efficient communication.

Access to Specialized Frequencies: High-end walkie talkies, like those from QYT, often support UHF (Ultra High Frequency) or VHF (Very High Frequency) bands across a wide range of channels. This capability allows users to operate on licensed frequencies for better range, clearer signals, and reduced interference.

Choosing the Right Walkie Talkie for Your Needs

When selecting a walkie talkie, consider how many channels you'll realistically need. For casual users, such as hikers or families on a camping trip, devices with 22 channels are usually sufficient. However, if you’re part of a business or industry that requires secure and uninterrupted communication, opting for a programmable model with hundreds of channels is a wise investment.

At QYT Electronics Co., Ltd., we offer a variety of walkie talkies designed for both consumer and professional use. Our devices are known for their reliability, wide channel support, and advanced features, making them ideal for industries like construction, logistics, and security.

Conclusion

The number of channels a walkie talkie supports may not seem like a big deal at first glance, but it plays a significant role in ensuring clear, uninterrupted communication. Whether you're a casual user or a professional, understanding the importance of channels can help you choose the right device for your needs. With QYT’s high-quality walkie talkies, you can enjoy enhanced connectivity and performance, no matter where you are.

1. What is a Two Way Radio?

A two way radio is a device that allows for two-way communication, meaning you can both send and receive messages. It operates using radio waves and can be used for both short and long-range communication. The QYT KT-9900 mobile radio, for example, is a popular choice due to its efficient communication features and durable design.

2. How Does a Two Way Radio Work?

A two way radio works by transmitting radio signals between a transmitter and a receiver. When you press the “talk” button, the two way radio converts your voice into a radio signal that is broadcast over a specified frequency. The receiving unit then picks up the signal and converts it back to sound. The QYT KT-7900D mobile radio supports multiple channels and frequency bands, offering a wider communication range, making it perfect for users who need continuous contact.

3. What are the Advantages of Using a Two Way Radio?

The main advantages of a two way radio include its reliability and cost-effectiveness. Unlike mobile phones, two way radios do not rely on cellular networks, making them useful in remote areas without phone service. Moreover, two way radios are easy to use, require minimal maintenance, and provide instant communication over long distances. The QYT CB-58 handheld radio, for example, offers excellent signal reception, making it suitable for a variety of environments, especially for users who need a rugged device.

4. Can a Two Way Radio Be Used for Long Distances?

Yes, the communication range of a two way radio can vary greatly depending on the model and frequency. Some two way radios are designed for short-range communication (less than a mile), while others, especially those using lower frequencies, can cover several miles or more. For example, the QYT KT-7900D can cover wider areas with multiple frequency bands, suitable for users needing long-range communication. However, obstacles such as buildings and trees can affect signal transmission.

AC cooling fan introduction - Chungfo Electronic

AC cooling fan is the major aspects of different varieties of industrial products, including electrical machinery and electronic digital products which all demands cooling fan as the major device for energy managing. By developing the environment flow, cooling fan provides cool air to decrease the temperatures of your industrial equipment, also, will help the industrial electrical or electronic digital projects to hold our prime effectiveness as well as its performance is definitely not minimized due to the heat produced.

As the part of the electronic digital components, AC cooling fans are widely developed in the home appliance or different varieties of industrial electronic digital machinery. It is because AC coolinf fan offers stable air movement consistently, which assists to stable the machinery performance, hence the machinery is definitely not from operate due to the overheat.

AC cooling fan works with AC power, and by operating of your impellers to generateair flow to decrease the temperatures of your machinery, which will help prevent the machinery from overheat. The many between AC fan and DC fan is – AC cooling fan air flow is stable and consistently, that may typical the machinery temperatures. Also, by changing the fan speed to meet the objective of energy managing.

AC coolinf fan could be categorized in 2 major models, depending on its design –

AC axial fans – the air flow it creates is vertical with the fan impeller, the air in and out is in the same direction. AC axial fans’ main advantages are – big air flow, easy assembly, high efficiency, and high speed. With multiple product selection with different air flow and speed, it allows the users to choose the axial fans meets their requirements most. External rotor axial fans provides stronger air flow and higher speed, and with metal impeller design, it fits better for customers who need to use the fans in a rugged circumstance.

AC cross-flow fan the air-in direction is horizontal with air-out. The design of impeller and air-out area is narrow, which fits most to install on the flat machines, like elevators, air conditioners,electronic equipment and so on.

If you need to know more about Chungfo AC fan,please don’t hesitate to contact with us.

AC, DC, EC fans Features

When it comes to cooling fans, it is estimated that everyone is very familiar with them. They are indispensable in our life, such as household appliances, electronic products, digital computers, medical equipment, etc. They will be used as long as they need cooling and exhausting. Cooling fans can be divided into AC fans, DC fans and EC fans. Here, I will explain the difference between AC / DC / EC fans:

AC fan is what we call AC cooling fan. The principle and manufacturing method of this kind of fan are very simple. Its characteristic is that the power frequency is fixed and will not change with the positive and negative voltage.

DC fan and EC fan belong to DC cooling fan, but there are some differences between them. A simple summary: DC input is DC, EC can input AC, which converts AC into DC.

Advantages of AC fan:

1. Provide stable and continuous air volume.

2. Hot air can be discharged and colder air can be inhaled.

Advantages of DC fan:

1. Minimal electromagnetic interference.

2. Low energy consumption.

Advantages of EC fan:

It has the characteristics of high intelligence, high energy saving, high efficiency, long service life, low vibration, low noise and continuous work.

We are Chungfo, a professional manufacturer of cooling fans. We prodece DC axial fan, DC blower fan, DC frameless fan, AC fan, AC / DC cross flow fan, EC fan and so on.

In addition to the DC brushless motor, there is another type of shaded pole induction motor in the exhaust cooling fan.

As the name suggests, Induction motors is because electromagnets in the stator induce magnetism in the rotor. They induce magnetism in the rotor because, unlike the rotor in a brushless DC motor, the rotor in an induction motor contains no magnets.

A separate small winding is used in the stator, called the shielded coil. The electromagnets in the stator are formed by coils around steel laminations. The shading coil is wound around a small section of the laminations. When ac is supplied to the main winding, a portion of the resulting magnetic flux links to the shading coil. This induces a current in the shading coil which behaves like the secondary of a transformer. The induced current, in turn, produces its own (weak) magnetic flux which lags the magnetic flux in the main portion of the stator. Consequently, there is a time and space displacement between the two fluxes. This time and space displacement sets up the conditions for a rotating (or shifting) magnetic field. The rotating magnetic field is what starts and keeps the rotor turning.

Some shielded pole motors do not use shielded coils. Instead, they use a small gap in the lamination, which is enough to generate the hysteresis magnetic field needed to rotate the rotor.

The advantage of AC cooling fan shaded pole motors is that they are inexpensive because they have a pretty simple construction. But the problem is that they are inefficient, mainly because of the lossy linkage between the shaded coil and main winding. The efficiency of shaded pole motors generally is only between 15 and 30%. And the power factor is rather low as well.

A low power factor and efficiency is probably ok for applications where there is only one small cooling fan (shaded pole motors are generally 40 W or less). But consider an application like a data center, which includes racks and racks and racks and racks of severs, and each of those servers has its own fan. It is not advisable to have hundreds or even thousands of fans all operating at only 30% efficiency. Brushless motor technology and its efficiency of 90% are more suitable for these applications.

Motors that power ventilation cooling fans are usually divided into brushless motors or induction motors.

Brushless motors are sometimes called electronically commutated motors. Commutation refers to the act of switching the electrical connection from one motor winding to the next one. Motor windings in the DC cooling fan motor  is generally located in the stator or stationary portion of the motor. Then the rotor contains a magnet with alternating poles. (DC motor with the magnets in the rotor are sometimes called outrunner. There are other possible configurations but they are not as widely used as outrunners.)

The brushless DC fan motor uses an electronic controller to sequentially energize the stator windings, turning them into electromagnets, in a sequence that turns the rotor. First, one set of coils (that is, a coil and the coil located 180º away from it) would be energized to become electromagnets. This causes the opposite poles of the rotor and stator to be attracted to each other. As the rotor nears the energized coil, the next coil is energized and the coil nearest the rotor pole is switched off. As the rotor rotates near the next coil on the stator, the coil nearest the rotor pole is switched off. This sequence repeats as the rotor runs. The point to note is that there is always one set of coils pulling the rotor, causing it to rotate.

In fact, the set of coils behind the set pulling on the rotor is energized in a way that pushes on the rotor rather than pulls it. So there is a combined effect of pulling and pushing on the rotor which gives this motor high efficiency. The combined effect is that most of the coils in the stator act on the rotor nearly all the time.

One aspect of brushless motor operation is the necessity of knowing the position of the magnetic poles in the rotor. In order to fire the right stator coils at the right time, the controller must sense the position of the rotor. The controller reads the rotor position sensor to decide what coils to energize.

The usual way to sense the rotor position is with a Hall Effect sensor. It’s also possible to measure the back-EMF in the undriven coils to infer the rotor position, thus eliminating the need for separate Hall effect sensors, but that scheme is a bit more complicated. The efficiency of brushless motor is usually 85% to 90%, mainly because most of the energy entering the coil actually drives the rotor.