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Several factors to consider when purchasing a walkie-talkie
The question of buying a walkie-talkie has been asked a lot of people in the jar, but no one has come to systematically sort it out, so it seems that it hasn't been known to the people of the earth. For the several issues that need to be considered before the purchase, I tried to do some sort of finishing. If there is something wrong, I would like to ask you to make corrections and hope to have a certain reference to the friends who are ready to purchase.
First, the purchase of interphone need to consider several factors
Whether it's a difficult field trip or a leisure activity such as skiing or horseback riding, the walkie-talkie is the best way to maintain contact between teams. The special nature of field activities also puts forward some special requirements for our purchase. The key considerations are:
1, power supply
2, frequency compatibility
3, can be used for waterproof, shockproof
4, power
1, the choice of power
The commonly used walkie talkie power supplies are: lithium rechargeable batteries, nickel-metal hydride rechargeable batteries, AA alkaline batteries. In general, charging cannot be performed in the field. Therefore, standby time and talk time of a walkie-talkie are more important parameters. Otherwise, it often occurs when the communication needs to be communicated. In general, lithium-ion batteries and nickel-hydrogen-powered walkie-talkies have a relatively large power, but the backup battery is a big problem; alkaline batteries are generally less than 2W for walkie-talkie power, but it is still possible to carry dozens of No. 5 batteries up the mountain.
2, communication frequency
The relationship between communication frequency and radio communication is like a road and a car. Now common walkie-talkies come from two sources: those brought back from abroad; and civilian walkie-talkies purchased at regular domestic stores. Although communications are performed in the UHF band, due to differences in domestic radio frequency band management regulations and international standards, the communication frequencies of these two kinds of walkie-talkies are also very different:
Domestic open civilian radio frequency: (less than 0.5 watts, can not be programmed to change the transmission frequency)
Frequency center frequency
1. 409.7500 MHZ
2. 409.7625 MHZ
3. 409.7750 MHZ
4. 409.7875 MHZ
5. 409.8000 MHZ
6. 409.8125 MHZ
7. 409.8250 MHZ
8. 409.8375 MHZ
9. 409.8500 MHZ
10. 409.8625 MHZ
11. 409.8750 MHZ
12. 409.8875 MHZ
13. 409.9000 MHZ
14. 409.9125 MHZ
15. 409.9250 MHZ
16. 409.9375 MHZ
17. 409.9500 MHZ
18. 409.9625 MHZ
19. 409.9750 MHZ
20. 409.9875 MHZ
U.S. FRS (Family Radio Service) home radio frequency band: (power below 0.5W)
Frequency center frequency
1 462.5625 MHZ
2 462.5875 MHZ
3 462.6125 MHZ
4 462.6375 MHZ
5 462.6625 MHZ
6 462.6875 MHZ
7 462.7125 MHZ
8 467.5625 MHZ
9 467.5875 MHZ
10 467.6125 MHZ
11 467.6375 MHZ
12 467.6625 MHZ
13 467.6875 MHZ
14 467.7125 MHZ
It should be noted that the power of domestic civilian radios is limited to within 0.5 watts. Otherwise, it is necessary to apply for an amateur radio license from the local Radio Management Committee to legally own high-power stations. (For Greenfield's friends, you can contact the golden monkey to apply for joining the ranks of Greenfield HAM). In foreign countries, radios over 1.5 watts often require an additional GMRS (General Mobile Radio Service) mobile radio station license for legal use. GRMS frequency and FRS have some differences, so buy a walkie-talkie abroad should also consider whether the FRS band interoperability problem.
3, can be used for waterproof, shockproof
Maybe you are starting to think about buying handheld radios. Hand-held radios can change the transmission frequency, have complex scanning functions, and have high transmission power, but one thing is its weakness: it is easy to do. Just like the incomparable import of VCD machines in our home menu, in fact, over time, we found that the commonly used functions are still very good for several domestic machines. The biggest advantage of the radio VS handheld radio is that it is easy to operate, and the professional radio is often easier to use. It can be learned in 5 minutes.
Due to the harsh conditions in the field, the waterproof and shockproof functions of the walkie-talkie should be taken into consideration. Like Rocky Pannel and army use standards emphasized by some walkie-talkies, it is actually very practical for Greenman. After all, in the wild we have to spend as much time as we can take care of ourselves instead of those delicate equipment.
4, power
In the case of a straight line without obstacles, the power of the walkie-talkie is basically proportional to the communication distance. The 0.5W walkie-talkie promises a straight line distance of about 3.2 kilometers, and a 2W walkie-talkie has 9-10 kilometers (in the valley, this distance will be greatly reduced). High power will bring a big power consumption problem, so it's best to consider the conditions you may encounter and the expected communication distance when purchasing.
Second, some suggestions for the green geeks to buy a walkie-talkie
Now Greenfield does not have a set of protocols for the formation of wild communications. However, with the popularization of radio knowledge and the improvement of the equipment level, the introduction of this agreement is only a matter of time. Due to historical reasons, there are many walkie-talkies in the FRS frequency band at Green Savage, and as Motorola starts to produce low-cost civilian walkie-talkies in China, there will be more and more intercoms using domestic civil frequencies in the future. Therefore, for a long period of time, Greenfield's field radio communications will be the situation where FRS walkie-talkies, domestic civilian frequency radios and dual-band radios coexist. I tend to encourage everyone to buy more domestic civilian frequency radios in the future.
I think there will be several types of users:
1. I need to be a simple, lightweight, non-degrading communication tool with a communication distance of 3 km: I recommend a domestic walkie-talkie, such as the T6200C.
2. I need a longer communication distance. It is suitable for communication tools used in the field for a long time: FWS/GRMS type 2W walkie-talkie is recommended. For example, Talkabout Distance DPS is a very good walkie-talkie; or 420-470MHZ single-band handpiece, cost-effective Not bad but power problems may be annoying.
3. I am not afraid of complicated work and professional knowledge. I am interested in field communication experiments. Join HAM ranks in Greenfield and buy the right hand and hand (another hobbing hobby.......^___^)
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