2, wireless communication equipment, no antenna, no emission;
3. When charging, the handheld radio can't transmit, so turn off the power switch to charge;
To sum up, the communication distance of walkie-talkie is affected by the following factors:
1, the power of walkie-talkie; 2. The transmitting power of interphone; 3. Geographical height of communication; 4. The surrounding electromagnetic environment signal shielding.
Some main performance indicators of walkie-talkies:
1) frequency error: the difference between the unmodulated carrier frequency and the allocated frequency;
2) Output carrier power: the average power given to the transmission line by the transmitter in a RF cycle without modulation.
3) Stray RF components: signals with significant components in discrete frequency or narrow frequency band except the modulation components near the carrier and its transmission bandwidth. Include harmonic and non-harmonic and parasitic components.
4) Adjacent channel power: the total output power of a transmitter operating in a system divided by the part of the channel, which falls within the specified bandwidth of any adjacent channel under the specified modulation conditions.
5) Audio distortion: the ratio of the root mean square value of a distorted sinusoidal signal except its fundamental component to the root mean square value of the whole signal, expressed in percentage. This distorted sinusoidal signal includes harmonic components, power supply ripple and non-harmonic components.
6) Modulation limitation: the ability of transmitter audio circuit to prevent modulation from exceeding the maximum allowable deviation.
7) Rated audio output power: the power that can be obtained when the output end of the receiver is connected to the specified load under the specified working conditions.
8) Reference sensitivity: Also known as the maximum available sensitivity, under the specified frequency and modulation, the input signal level with quasi-signal-to-noise ratio (12Dbsinad) is generated at the receiving end and the output end.
9) Selectivity: It represents the ability of receiver's useful input signal to resist useless input signal. The adjacent signal selectivity, * * channel rejection, blocking, spurious response, intermodulation immunity and other performances are measured and evaluated.
Summary:
Only by knowing and mastering radio-related knowledge, as well as the relevant indicators, parameters and characteristics of walkie-talkies, and strictly following them, can we give full play to the performance of walkie-talkies and help you.
Beifeng intercom started at 1989. For decades, we have been devoted to the research and exploration of professional wireless communication technology, and have dozens of patented communication technologies. It is one of the few scientific and technological communication enterprises and walkie-talkie manufacturers in the world that independently research and develop dPMR/DMR and PDT digital technologies. It is the first brand manufacturer in China to introduce the first set of dPMR digital trunking communication system walkie-talkie which integrates hand-held walkie-talkie, vehicle-mounted station and relay station. It is an intelligent technology leading the industry, and it is a digital cluster leading the industry.