The outdoor walkie-talkie is a communication device that must be provided when participating in outdoor activities. Because the cost performance and effect of communication are much better than that of the mobile phone, the walkie-talkie has become the most widely used communication equipment in outdoor sports. There are many types of outdoor walkie-talkies. How do we choose to buy them?

The walkie-talkie can be divided into two types according to the movement mode: the vehicle platform (fixed on the car) and the hand platform (handheld walkie-talkie). According to the frequency adjustment mode, it can be divided into two types: the dialable frequency and the fixed frequency. The frequency of the fixed frequency intercom is actually frequency. It can also be adjusted, but the code writer needs to write the frequency into it. It is not possible to input the frequency directly into the walkie-talkie by pressing the button like the radio frequency input transceiver.

The most commonly used walkie-talkies in our country are as follows:

1. The national exemption civil frequency (CFRS) works in the 409M frequency band and is fixedly divided into 20 channels, with a transmission power of 0.5 W and an open communication distance of 3 km. For example, a series of home walkie-talkies of MOTO, this type of walkie-talkie is bought. Can be used without any restrictions.

2, FRS Europe and the United States home frequency, working in the 469 frequency band, divided into 14 channels, the transmission power of 0.5 W, the open communication distance of 3 km, this walkie-talkie in domestic use should be said to be illegal, because the 469M frequency band countries are not allocated For amateurs.

3, amateur walkie-talkie, working in the 430-450 or 150M frequency band, the general handheld power transmission within 3W, the launch distance of 10 kilometers, the vehicle-mounted machine thanks to the power within 30W, the launch distance of dozens of kilometers, this is the national radio amateur The frequency band used by enthusiasts, but using this type of walkie-talkie, legally speaking, you should go to the Radio Management Board exam, get the membership card, and then check the walkie-talkie. After passing the test, you will get a global unique call sign. It can only be legally received or transmitted.

4. In other frequency bands, there are 400-420 frequency bands and 450-470 frequency bands commonly used in the market. Among them, 400-420 walkie-talkies can communicate with each other if they are the same as CFRS, and 450-470 can communicate with FRS.

The special nature of the field activities puts forward some special requirements for our purchase, among which the key considerations are: power supply, model and communication frequency, operability, waterproof and shockproof, and transmission power.

1, the choice of power supply

Commonly used walkie-talkie power supplies are:

Rechargeable batteries: lithium battery and nickel-metal hydride. It is generally impossible to charge in the field, so the standby time and talk time of the walkie-talkie are an important parameter. Otherwise, the communication cannot be communicated due to insufficient power of the walkie-talkie when communication is most needed. In general, the power of the walkie-talkie with lithium battery and nickel-hydrogen as the power source is relatively large, but the backup battery is a big problem.

Disposable battery: that is, non-rechargeable battery. AA alkaline batteries, the power of the walkie-talkie with the alkaline battery as the power source is generally less than 2W, but with the extra battery to go up the mountain without affecting the communication.

The suggestion is: the walkie-talkie generally uses rechargeable batteries as much as possible, which saves money. Although the one-time investment of rechargeable batteries is larger, it can be used repeatedly. On average, the cost per time is much less than that of disposable batteries. Good for environmental protection. If you have a long time in the wild (more than five days can not be charged), you should bring some disposable batteries for spare, and choose a large capacity, such as Nanfu. The battery used for headlights, digital cameras, etc. should also be

2, model and communication frequency

The communication frequency is the communication frequency set by the intercom. The two intercoms must be intercommunicated, and their communication frequencies must be the same.

The common walkie-talkies nowadays mainly include:

Professional machine, its frequency can be set freely within a certain range; commonly used walkie-talkies generally have: VHF section (very high frequency, wavelength 2 meters), divided into VL section: 130-150Mhz; VH section: 150-174Mhz; also have V The segment is full of machines 130-174Mhz. UHF section machine (UHF, wavelength 70 cm), divided into UL section: 400-420Mhz and UH section: 450-470 section; also has a full section of 400-470Mhz.

In terms of communication distance, the V-segment machine is stronger than the U-segment machine, mainly because the V-segment frequency has better penetration and diffraction than the U-segment, and is not easily blocked by the mountain, but since the V-segment frequency is not a civilian frequency, outdoor personnel Generally do not use it.

3, operability

The frequency of sending and receiving of the professional walkie-talkie can be continuously changed within a certain range, and the function is also large. The transmission power is large, but setting its frequency, etc., it is really troublesome to operate. The light manual has dozens of pages, which is difficult to remember and difficult to learn. Like a professional camera, but also adjust the shutter and adjust the focal length, etc., but after setting it up, it is the same as the civilian machine. Press the PTT button to speak, release it and listen. The civilian machine is like a point-and-shoot camera, as long as you press the shutter, it is very easy to operate. The civil speaker panel is simple and can be operated in a few minutes.

4, waterproof and shockproof

The harsh conditions in the field, the waterproof performance of the lecturer is high, and the waterproof performance of the general civil and professional machines is very poor. The waterproof walkie-talkie is very expensive. Therefore, we can use the intercom opportunity to use the plastic bag when it rains. Of course, put the machine in a waterproof bag, and connect the headset to use it better. The anti-shock function should also be considered. For example, Motorola's professional machine is produced according to military standards. Whether it is waterproof or shockproof, it is very good, but it is expensive, and you can consider buying it with rich money. I have seen many outdoor games. I am willing to buy a knife of more than a thousand yuan, but I am not willing to buy a walkie-talkie for several hundred dollars. Generally speaking, as long as you don’t fall, there will be no problem.

5, the transmission power

The communication distance of the walkie-talkie is proportional to the transmit power. The communication distance marked by the walkie-talkie refers to the distance at sea level. It is only 1/3 to 1/4 of the nominal value in the city or mountainous area. A nominal 10KM walkie-talkie is in the mountainous area. It can only pass 2~3KM, so it is necessary for us to purchase a walkie-talkie with a higher power, such as >2W, to ensure effective communication.

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