What factors influence the distance and effect of the intercom?
The factors affecting the distance and effect of the intercom are as follows:
1. System parameters
(1) The stronger the output power of the transmitter, the greater 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, affect the life of the power amplifier component, but also have strong interference, affect the communication effect of others, and will also produce radiation pollution. Radio regulatory agencies in 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 is enhanced. The antennas used in handheld walkie-talkies are generally helical antennas, whose bandwidth and gain are smaller than other types of antennas, and are more easily affected by the human body.
2. Environmental factors
Environmental factors mainly include paths, tree density, electromagnetic interference of the environment, 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 insufficient. 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 and the frequency band of the machine are inconsistent, and the impedance of the antenna does not match, which will seriously affect the call distance. For users, pay attention to tighten the antenna when changing to the radio antenna. In addition, you cannot use antennas not provided by the manufacturer casually, or use antennas that do not meet the frequency of the machine.
4. The quality of the sound
It mainly depends on the pre-emphasis and de-emphasis circuits. At present, there are more advanced voice processing circuits "application of voice companding circuit and low-level expansion circuit", which has a good effect on fidelity voice.
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