1, commonly used walkie-talkie power supply
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.
Oil Field Mud Pump,Oil Mud Pump,Mud Pump G800,Oil Mud Pump G800
Jinan Guohua Green Power Equipment Co.,Ltd. , https://www.guohuagenerator.com