What are the factors affecting the distance and effect of the walkie-talkie?

What factors affect the distance and effect of the walkie-talkie?

There are several factors that affect the distance and effect of the walkie-talkie:

1, system parameters

The stronger the transmitter output power, the larger the coverage of the transmitted signal and the farther the communication distance. However, the transmission power should not be too large, and the transmission power is too large, which not only consumes electricity, but also affects the life of the power amplifier components, and is highly interfering, affecting the call effect of others, and also causing radiation pollution. Radio management agencies in various countries have clearly defined the transmission power of communication equipment.

The higher the receiving sensitivity of the communication machine, the farther the communication distance is.

The gain of the antenna, when the antenna is matched with the machine, usually, the antenna height is increased, and the receiving or transmitting capability is enhanced. The antenna used for the walkie-talkie is generally a helical antenna, and its bandwidth and gain are smaller than other types of antennas, and are more susceptible to human influence.

2. Environmental factors

Environmental factors mainly include paths, tree density, environmental electromagnetic interference, buildings, weather conditions, and terrain differences. These and other parameters directly affect the field strength and coverage of the signal.

3. Other influencing factors

The battery is low. When the battery is low, the call quality will deteriorate. In severe cases, there will be noise, affecting normal calls.

Antenna matching. The frequency band of the antenna is inconsistent with the machine frequency band, and the antenna impedance does not match, which will seriously affect the call distance. For the user, pay attention to tightening the antenna when switching to the antenna of the walkie-talkie. In addition, you should not use the antenna provided by the manufacturer, or use the antenna that does not meet the frequency of the machine.

4, the sound quality is good or bad

It mainly depends on the pre-emphasis and de-emphasis circuits. At present, there are more advanced speech processing circuits "applications of speech companding circuits and low-level expansion circuits", which have a good effect on fidelity speech.