Walkie-Talkie Basics (2)

How to use the walkie-talkie:

1. When the walkie-talkie is transmitting, keep the walkie-talkie in a vertical position and keep the microphone 2.5-5cm away from your mouth. When launching, keep the radio at least 2.5 cm from the head or body. If the hand-held walkie-talkie is carried on the body, the antenna should be at least 2.5 cm away from the body when transmitting.

2. During use, do not turn on and off many times and adjust the volume to a volume suitable for your hearing.

The factors that affect the distance and effect of the walkie-talkie 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 farther the communication distance. However, the transmission power should not be too large. If the transmission power is too large, it will not only consume electricity and affect the life of the power amplifier components, but also have strong interference, which will affect the effect of other people's calls and will also produce 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 machine, 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 capability is enhanced. The antenna used in the hand-held walkie-talkie is generally a helical antenna, whose bandwidth and gain are smaller than other types of antennas and are more easily affected by the human body.

2. Environmental factor

Environmental factors mainly include paths, tree density, environmental electromagnetic interference, buildings, weather conditions, and terrain differences. These factors and several 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 is low, the call quality deteriorates. In severe cases, there will be noise, affecting normal calls.

(2) Antenna matching. The frequency band of the antenna is inconsistent with the frequency band of the machine, and the impedance of the antenna does not match, which will seriously affect the call distance. For users, when changing the antenna of the walkie-talkie, pay attention to tightening the antenna. In addition, you cannot use the antenna provided by the manufacturer, or use the antenna that does not conform to the frequency of the machine.

4. Quality of Sound

It mainly depends on the pre-emphasis and de-emphasis circuits.