What is the influence of the intercom system parameters on the call distance?

The stronger the output power of the transmitter, the greater the coverage of the transmitted signal and the farther the communication distance. However, the transmitting power should not be too large, the transmitting power is too large, which not only consumes power and affects the life of the amplifier components, but also has strong interference, affects the call effect of others, and will also produce radiation pollution. The radio regulatory agencies of various countries have clear regulations on the transmission power of communication equipment.

The higher the reception sensitivity of the communicator, the farther the communication distance.

The gain of the antenna, when the antenna is matched with the machine, as is often the case, the antenna height increases, and the reception or transmitting capability increases. The antenna used in handheld walkie-talkies is generally a spiral antenna, which has a smaller bandwidth and gain than other types of antennas, and is more susceptible to human influences.

a) System parameters:

1) The output power of the transmitter (the stronger the transmitting power, the greater the coverage of the transmitted signal and the farther the communication distance.) However, the transmission power should not be too large, if it exceeds the specified range, not only the power consumption will affect the life of the components in the machine, but also the effect of other people's calls will be affected due to strong interference. Radiation contamination is also generated.

2) The sensitivity of the communication machine (the higher the sensitivity, the farther the communication distance) 3) The gain of the antenna, the increase in the height of the antenna, and the increase in sensitivity.

2) Environmental factors: paths, topography, electromagnetic field interference, forest density, and weather conditions will directly affect the quality and distance of communications.

c) Other factors:

1) Battery power (if the battery is insufficient, there may be noise, which will seriously affect the normal call) 2) Whether the antenna frequency band is consistent with the machine frequency band, if not, it will seriously affect the call distance.

3) The pre-emphasis circuit and the de-emphasis circuit will directly affect the sound quality.

4) There are also seasonal factors that affect the communication distance and effect, and the use effect in summer is generally better than that in winter.

Handheld wireless intercomThe call distance can be up to 5 kilometers in a flat, open and barrier-free environment

This is a small size, light weight, small power wireless walkie-talkie, suitable for handheld or bag, easy for individuals to carry, can communicate in the process, its power is generally VHF frequency band does not exceed 5W, UHF frequency band does not exceed 4W.

The communication distance can generally reach 5 kilometers in an open area without obstacles. The aircraft is suitable for communication between mobile personnel in various occasions in close proximity. In the series of wireless machines, the number and variety of applications of handheld radio "walkie-talkies" are the largest, accounting for more than 80%.

My dear, your question is unreasonable, the effective distance of the walkie-talkie and your use method, the power of the walkie-talkie itself, the environment of use, etc., are related, and the walkie-talkie can also add a repeater, and even can be connected to the satellite by technical means, then the call distance is a world of difference.

Depending on the model, the distance is also different.

Moto's 6200 series machines can only guarantee stable communication at 500 meters.

Machines such as North Peak 5118 can guarantee stable use for 1 km.

4W machines such as Kenwood 3107 can guarantee stable use for 2 km.

Moreover, the communication effect of the walkie-talkie is also different according to the local environment. If both of them are on the roof of a tall building, the machine can still communicate for 10 kilometers, and if both of them are in different basements, the 4W machine may not be able to travel two or three hundred meters.

Handheld walkie-talkie in the absence of repeater cooperation, according to the walkie-talkie transmission power, the normal and effective communication distance is 1---6 kilometers, different transmission power, different communication environment has a greater impact on the wireless walkie-talkie communication distance. Handheld walkie-talkie in the absence of repeater cooperation, according to the walkie-talkie transmission power, the normal and effective communication distance is 1---6 kilometers, different transmission power, different communication environment has a greater impact on the wireless walkie-talkie communication distance. Handheld walkie-talkie in the absence of repeater cooperation, according to the walkie-talkie transmission power, the normal and effective communication distance is 1---6 kilometers, different transmission power, different communication environment has a greater impact on the wireless walkie-talkie communication distance.

Depending on the size of the antenna and frequency, it is generally 200 to 150,000 meters! It depends on what you're buying, and it's usually about 3 kilometers.

The channel is different, the signal is different, the brand is different, and it is between 100 meters and 2 kilometers.

Unobstructed 3 km, there are larger, look at the transmit power.

That's based on the power of the walkie-talkie.

There are good and bad, the price is different, and the distance is different.

Generally, it is about 5km. It's worse in the mountains.

The distance varies depending on the model.

Generally walkie-talkies are 1 to 3 km

Depending on how much the transmitting power of the walkie-talkie is, it is generally 2 to 4 kilometers.

During the use of the walkie-talkie, you should also pay attention to the specific distance, if it is too far, you may not receive the signal. What is the effective distance of that walkie-talkie? PChouse will take you to find out.

Specifically, the communication distance of general civilian walkie-talkies is less than 5 kilometers, and most of them are about 2-3 kilometers. Individual users can purchase civilian walkie-talkies. The professional conventional walkie-talkie can communicate up to 3-10 kilometers in the city.

The police walkie-talkie is about 5-20 kilometers away. Military walkie-talkies are generally not less than 15 kilometers and can be as high as 50 kilometers or more. In addition, there is also a kind of trunking walkie-talkie, which needs to be supported by a radio network, so the communication distance is relatively long, up to more than 1500 kilometers.

As a wireless communication tool, walkie-talkies have their own characteristics compared to mobile ** in a pair.

1. In the one-to-many directional special communication, it has the characteristics of establishing rapid communication, especially the one-to-many characteristics are incomparable to ordinary mobile communications.

Professional walkie-talkie refers to a walkie-talkie with a transmitting power of 4-5W and a frequency range of 136-174MHz or 400-480MHz, and the distance of this type of walkie-talkie is generally between 3 and 8 kilometers (depending on the specific environment).

Walkie-talkies for civilian use.

Civil walkie-talkie refers to the transmission power is not more than 1W, the frequency range is between 409MHz walkie-talkie, civil walkie-talkie general walkie-talkie distance is shorter, (open space 3 km) is the state approval without a license can be used wireless communication equipment. Civil walkie-talkies are small in size, diverse in color, and generally only 300-600 yuan are low, which is more suitable for personal business trips, tourism, and restaurants.

Amateur walkie-talkie.

Amateur walkie-talkie is a radio walkie-talkie designed and produced to meet the needs of amateur radio enthusiasts. This type of walkie-talkie can also be called a "play machine". For this amateur personal radio service, various countries have opened up dedicated frequency bands for amateur radio sports enthusiasts.

The frequency bands opened up by China are 144 146MHz and 430 440MHz, and countries around the world generally have this frequency band. Amateurs only need to buy their favorite models, apply for a local radio network access license, and have nothing to talk to others. Countries around the world generally use this band.

The intercom distance is between 300 meters and 5 kilometers.

The transmitting power and talking distance of the walkie-talkie: the power of the walkie-talkie is basically proportional to the communication distance in the case of no obstacle in a straight line.

The promised straight-line call distance of the walkie-talkie is generally about 1 km, and the 2W walkie-talkie is 2-3 km (this distance will be greatly reduced in the mountains).

High power directly brings the problem of high power consumption, so it is best to consider the situation you may encounter and the expected communication distance when buying a walkie-talkie. Usually used in cities, obstacles are the factor that has the greatest impact on the distance a signal travels.

Professional walkie-talkies with a power of up to 5 watts generally have a real talking distance of only 2 or 3 kilometers in the city. In high ground, more buildings, or more sealed rooms, the call distance will be shorter.

However, when there is a system base station support, the call range of the walkie-talkie can reach more than ten kilometers or even tens of kilometers, (if both walkie-talkies are at a high place, it can also reach more than ten kilometers).

The communication distance of the walkie-talkie is directly proportional to the transmitting power.

Generally, the communication distance marked by the walkie-talkie refers to the distance at the sea level, that is, the theoretical distance.

In the city or mountainous area may only have a nominal value of 1 3 to 1 4, a nominal 10km walkie-talkie can only pass 2 3km in the mountainous area, so it is necessary for us to buy a more powerful walkie-talkie, such as 2W, to ensure effective communication.

But the power of the walkie-talkie is not as big as possible, and the higher the power, the greater the power consumption.

In the field of radio, there is actually no technical parameter of distance, because there are many factors that affect the propagation distance of wireless signals. The walkie-talkie sold on the market, the manufacturer's nominal maximum call distance is 3 kilometers, this call distance is only a theoretical calculation data, it is based on the transmission power, that is to say, the maximum call distance of the walkie-talkie in the absence of obstacles and electromagnetic interference. In actual use, due to the different environments in which the user is located, the background noise is large and small, and the electromagnetic interference is strong and weak, so the actual call distance is generally less than 3 kilometers.

Many users often mistakenly think that when buying walkie-talkies, the call distance can reach 3 kilometers, which is unlikely, we can not predict the user's use environment, of course, it is impossible to give the actual call distance. Therefore, when answering the customer's question about the distance (straight-line distance in the city), the objective answer of the professional manufacturer of Toppod digital walkie-talkie is handheld walkie-talkie: 5 watt professional machine:

2000-5000 meters; 2 tile hand: 1000-3000 meters; Civil aircraft: 200-1500 meters.