保安服务公司解析无线电对讲机的主要性能 - 行业动态

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保安服务公司解析无线电对讲机的主要性能

来源:http://www.zzzhongtebao.com/  点击次数:    发布时间:2018-08-22
保安服务公司使用的对讲机有如下一些首要的功能目标:
The walkie talkie used by security service companies has the following main functions:
频率差错:未调制载波频率与指配频率之差;
Frequency error: the difference between unmodulated carrier frequency and allocated frequency.
输出载波功率:在未加调制的情况下,一个射频周期内发射机架给予传输线的平均功率
Output Carrier Power: Average power given to the transmission line by the transmitter rack during a radio frequency cycle without modulation
杂散射频重量:除了载波及其发射带宽附近处的调制重量外,在离散频率上或在窄频带内有一明显重量的信号。包含谐波和非谐波以及寄生重量。
Clutter Scattering Weight: A signal having a significant weight at a discrete frequency or in a narrow band, in addition to the modulation weight near the carrier and its transmission bandwidth. Contains harmonic and non harmonic and parasitic weights.
邻道功率:在按信道区分的体系中作业的发射机,以规则的调制条件下总输出功率中落在任何一个相邻信道的规则带宽内的那一部分功率。
Neighborhood power: The part of the total output power that falls within the regular bandwidth of any adjacent channel in a transmitter operating in a channel-differentiated system under regular modulation conditions.
音频失真:除掉其基波重量的失真正弦信号的均方根值与全信号均方根值之比,用百分数表示,这一失真的正弦信号包含谐波重量、电源纹波和非谐波重量。
Audio Distortion: The ratio of the RMS value of the distorted sinusoidal signal to the RMS value of the full signal is removed. The distorted sinusoidal signal is expressed as a percentage. The distorted sinusoidal signal includes Harmonic weight, power ripple and non-harmonic weight.
调制了约束:发射机音频电路避免调制超越大答应偏移的能力。
Modulating the constraints: transmitter audio circuits avoid modulating the ability to exceed maximum permitted offsets.
额外音频输出功率:当接纳机在规则的作业条件下其输出端衔接规则负载时可得到的功率。
Extra Audio Output Power: The power available when the receiver's output connects to a regular load under regular operating conditions.
参阅灵敏度:又称为大可用灵敏度,在规则的频率和调制下,使接纳输出端发生准信噪比(12Dbsinad)的输入信号电平。
枣庄保安公司加盟
Reference Sensitivity: Also known as the maximum available sensitivity, at regular frequencies and modulations, the receiving output end produces a quasi-signal-to-noise ratio (12Dbsinad) input signal level.
选择性:表征接纳机有用输入信号抵抗无用输入信号的能力。经过丈量邻信号选择性、共信道按捺、堵塞、杂散响应、互调抗扰性等功能加以鉴定。
Selectivity: characterizing the ability of the receiver to use input signals to resist useless input signals. After measuring the neighboring signal selectivity, the common channel is identified by such functions as scratching, blocking, spurious response, intermodulation immunity and so on.
需要指出的是:对讲机的电功能目标各国和各地区以及不同的职业都因为各规范的丈量方法也有不同,所以不能简略地根据目标的数值来断定产品目标的大小,还要有详细规范为根据。如:互调抗扰性目标,欧洲规范、美国FCL,香港电讯局规范中,因为丈量方法的不同,在丈量同一台机器时,目标数值有很大的不同。
It should be pointed out that the target of intercom's electrical function is different in different countries and regions as well as in different occupations, so the size of the target can not be judged simply according to the target value, but also based on detailed specifications. For example: Intermodulation immunity target, European code, FCL code, Hong Kong Telecommunication Bureau code, because of the different measurement methods, in measuring the same machine, the target value is very different.
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