A very common question we hear about 2-way radios: "How will they work?" Unfortunately, this is a bit like the old "how long is a string?" question. Many factors affect the range of two-way radios.
Transmission power, antenna efficiency, altitude and surrounding terrain are just a few of these factors that need to be considered. The only practical comparison that we can do in a mythical "ideal" position without flat ground without any obstacles. As the most popular two-way radio systems are the simple hand-held type, we will first discuss these.
A good general guideline is that a portable radio is waiting for a 1 watt transfer power (no restriction) to provide approximately 1 mile of coverage. The doubling of the transmitter's power increases the range by about 1/3, so … at 2 watts approx. At 4 watts the range is approx.
As can be seen above, the relationship between transmission power and range is not as expected. Transfer performance is fourfold to double the range! Keep in mind that in the United Kingdom, portable computers are usually limited to 5 watts.
Although radio less restricts the radio, mobile radios permanently installed in vehicles are performing better. As in the United Kingdom, the general limit for mobile phones is 25 watts, depending on the antenna, approx. Again, this applies to a simple system that is directly from one mobile to another.
If a base station is used within the system, the expansion range is improved by incorporating an external antenna at the top of the building. The higher the antenna, the better the range. Again, the thumb rule is very similar to the above … doubling the height of the antenna does not increase the range! It does not affect the range between mobile phones unless the base station is a "repeater type" that allows mobile broadcasts to be skipped between users. Again, we ask the same question again and again. "How can I increase my domain?"
As mentioned above, the elevation of antenna elevation is necessary (with high costs). Or, it greatly increases transmission performance. In the United Kingdom, OFCOM is the licensing authority and unlawfully permits it. Due to the lack of available frequencies, they generally limit the coverage of radio systems to allow for the re-use of frequencies in neighboring geographic areas.
Source by sbobet