What are the seven weapons of the walkie-talkie？

The walkie-talkie, which looks inconspicuous but has outstanding features, actually relies on these "seven weapons":
Working frequency
The working frequency band of walkie-talkies is allocated and managed by the China Radio Regulation Commission. According to regulations, the VHF band 136 MHz ~ 174 MHz and the UHF band 400 MHz ~ 470 MHz are used for professional walkie-talkies, 433 MHz is used for outdoor hiking, 900MHz/1800MHz is used for mobile phones, and 409 MHz ~ 410 MHz is used for civilian use. Although there are many working frequency bands, the frequency band we use in daily life is 409 MHz~410 MHz. You must not use other frequency bands beyond the regulations to avoid interference to other people in the dedicated frequency band.

communication channel
According to fixed steps (for example: 25 KHz (wideband), 20 KHz, 12.5 KHz (narrowband)), the operating frequency band can be divided into multiple communication channels, such as: 409.7500 MHz, 409.7625 MHz, 409.7750MHz, 409.7875 MHz, 409.8000 MHz. The most commonly used walkie-talkies are the 20 channels between 409.7500 MHz and 409.9875 MHz.
There are so many communication channels, do we still need to try them one by one? Of course, you don’t have to. The walkie-talkie provides a channel scanning function: there is a dedicated button. After pressing it, the walkie-talkie will try to receive signals one by one through communication channels in a certain order. If you try 100 ms for each channel, you can try to scan 10 communication channels in one second, and the scanning speed is 10 ch/s.

Transmit power
Power is an important indicator of a walkie-talkie. The greater the power, the greater the communication distance between two walkie-talkies. The power of civilian walkie-talkies is within 0.5 watts. Walkie-talkies exceeding 0.5 watts need to apply for a radio station license before they can be used. The power of handheld walkie-talkies is generally within 5 watts, while the power of vehicle-mounted and ship-mounted radios is relatively large, ranging from 25 watts to 50 watts, and even 100 watts.

call range
When the walkie-talkie completely relies on itself to send and receive radio waves, the communication distance between two walkie-talkies is affected by various factors such as power and obstacles. In an open environment, the handheld walkie-talkie can maintain clear call quality within 0~3 kilometers. In the environment of many high-rise buildings in the city, the optimal communication range of handheld walkie-talkies is only within 1 to 2 kilometers.

antenna
We know that the higher the frequency of radio waves, the shorter the wavelength, and the corresponding shorter the antenna that receives the radio waves. Since the walkie-talkie uses a lower operating frequency band, the length of the antenna is relatively long if you want to receive radio waves. So when you see a "long-ear" handheld device, it's most likely a walkie-talkie.

Battery
In order to have a longer battery life, in addition to being equipped with a large-capacity battery, the walkie-talkie also provides an automatic power-saving function. If a walkie-talkie does not send a signal for a long time, it will automatically "sleep" for a period of time, and will not "wake up" until it receives a new signal or a key operation and returns to normal working status.

structure
The structure of the walkie-talkie is simple, and in order to be used in complex outdoor environments, it is also designed with waterproof, waterproof, earthquake-resistant and other functions, making it strong and durable.
​

https://yategood.com/products/g800