Runbo E81 IP67 Waterproof UHF VHF DMR POC Rugged Smartphone

Runbo E81 – 4 Inch IP67 Waterproof UHF/VHF DMR POC Rugged Smartphone (2019)

New generation of this reliable, multifunctional Rugged smart phone / walkie-talkie, will be ideally suited for EMS, Security, construction workers, oil & gas industry, truckers and other Industries, including leisure and outdoor activities. will be good everywhere where a combination of high-quality 4W 2-Way radio and a modern protected smart phone is needed.

runbo e81

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Talking distance of walkie-talkie

The talk distance of the walkie-talkie in a flat, open and barrier-free environment can be up to 6 kilometers, but the transmission of radio waves will be affected by obstacles (such as buildings and trees); similarly, some external factors often weaken the signal of the call. The scope also changes accordingly. When there is network support, the talk distance of the walkie-talkie can reach tens of kilometers. The factors that affect the distance and effectiveness of the intercom are as follows:
   1. System parameters:
  1) The stronger the output power of the transmitter, the larger the coverage of the transmitted signal and the longer the communication distance. However, the transmission power should not be too large. If the transmission power is too large, it will not only consume power and affect the life of the power amplifier components, but also have strong interference, affect the call effect of others, and also cause radiation pollution. The radio regulatory agencies of various countries have clear regulations on the transmission power of communication equipment. 2) The higher the receiving sensitivity of the communication device, the longer the communication distance.
  3) The gain of the antenna, when the antenna is matched with the machine, usually, the height of the antenna increases, and the receiving or transmitting ability increases. Antennas used in handheld walkie-talkies are generally helical antennas, whose bandwidth and gain are smaller than other types of antennas, and are more susceptible to human body influence.
  2. Environmental factors:
   Environmental factors mainly include paths, density of trees, environmental electromagnetic interference, buildings, weather conditions and terrain differences. These factors and other parameters directly affect the field strength and coverage of the signal.
  3. Other influencing factors:
  1) The battery power is low. When the battery power is low, the call quality will deteriorate. In severe cases, there will be noise, which affects normal calls.
   2) Antenna matching, the frequency band of the antenna is inconsistent with the frequency band of the machine, and the antenna impedance is not matched, which will seriously affect the communication distance. For the user, pay attention to tightening the antenna when changing to the antenna. In addition, it is not allowed to use an antenna that is not provided by the manufacturer or an antenna that does not conform to the frequency of the machine.
  3) The sound quality mainly depends on the pre-emphasis and de-emphasis circuits. At present, there are more advanced speech processing circuits “application of speech companding circuit and low-level expansion circuit”, which have a good effect on fidelity speech.
  4) The factors that affect the distance and effectiveness of the intercom are also related to the season, and summer is better than winter.

Learn about the types of eight walkie-talkies

The walkie-talkie and the mobile phone are a kind of wireless communication tool, but compared with the mobile phone, the walkie-talkie can not only communicate one-to-one, but also one-to-many, and there is no need for a call during the call. In the past, walkie-talkies were mostly used in public utilities, military, medical and other public utilities. Later, commercial applications such as hotels, security, and construction sites began to introduce walkie-talkies as the main communication tools.

Nowadays, ordinary users also have a lot of purchase walkie-talkies for self-driving, hiking, hiking and other recreational activities. There are more occasions to use, and there are more and more types of walkie-talkies. In general, the following eight categories can be classified:


First, professional walkie-talkie

Professional walkie-talkies usually refer to walkie-talkies with a transmission power of 4-5W and a frequency range of 136-174MHz or 400-480MHz. The most important feature of such walkie-talkies is that the call distance is long and can reach 3- in the case of little environmental impact. 8 kilometers. Professional walkie-talkies are generally used in construction sites, property management, factory workshops, etc. The operation is relatively simple, there is no digital button, only two knobs are used to control the channel number, power and volume.

Second, commercial walkie-talkie

The commercial walkie-talkie refers to a walkie-talkie with a transmission power of 0.5-4W and a frequency range of 400-800MHz, and the talk distance is between 800 meters and 8 kilometers. Compared with professional walkie-talkies, commercial walkie-talkies are lighter in shape and can be connected to headphones, mostly used in restaurants, shopping malls and other occasions.

Third, the civilian walkie-talkie

The civilian walkie-talkie refers to a walkie-talkie with a transmission power of 0.5-1W and a frequency range of 409MHz. These walkie-talkies have a short talk distance, a small size, and are much cheaper than professional and commercial walkie-talkies. They are usually available for 300-500 yuan and are suitable for individual users.

Fourth, amateur walkie-talkie

The amateur walkie-talkie refers to a walkie-talkie with a frequency range of 144-146MHz and 430-440MHz. It is designed for amateur radio enthusiasts. It is small in size and simple in operation. The disadvantage is that the call distance is generally small.

Five, explosion-proof walkie-talkie

There are few brands that produce explosion-proof walkie-talkies. The only three brands in the domestic market are MOTO, Weitex and HYT. The so-called explosion-proof means that the walkie-talkie can be used in flammable and explosive environments, such as coal mines, gas companies, gas stations and other places.

Sixth, railway walkie-talkie

The railway intercom refers to the intercom designed for the working needs of the railway department. The transmitting power is generally 4-5W and the frequency range is 440-470MHz. Because the train is very noisy when driving, the audio output of the railway intercom is very demanding, and the voice quality will be clearer through voice compression.

Seven, police walkie-talkie

The police intercom is a special equipment for the public security system. The frequency range is 350-370MHz or 370-390MHz. No one can steal or steal in any way. Therefore, when selecting the walkie-talkie, users should pay attention to the transmission range of the walkie-talkie to 400-420MHz or 450-470MHz, to avoid unnecessary trouble.

Eight, car walkie-talkie

The working voltage of the car radio is 12.5V, and the voltage of the car is generally 12V or 24V. Therefore, when the car radio is to work on a car with a voltage of 24V, it is necessary to install a transformer between the car and the intercom. The radio power of the car radio is relatively large, generally 25-50W, the signal is transmitted far, but can not be moved at will, can only be fixed in the car.

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