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影响对讲机通话距离与通话质量的一些因素 | 骆驼调频
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影响对讲机通话距离与通话质量的一些因素
2008年01月01日 Radio ⁄ 共 520字 暂无评论 ⁄ 被围观 125 views+

1、系统参数
(1)发射机输出功率越强,发射信号的覆盖范围越大,通信距离也越远。但发射功率也不能过大,发射功率过大,不仅耗电,影响功放元件寿命,而且干扰性强,影响他人的通话效果,还会产生辐射污染。各国的无线电管理机构对通信设备的发射功率都有明确规定。
(2)通信机接收灵敏度越高,通信距离越远。
(3)天线的增益,在天线与机器匹配时,通常情况,天线高度增加,接收或发射能力增强。手持对讲机所用天线一般为螺旋天线,其带宽和增益比其他种类的天线要小,更容易受人体影响。
2、环境因素
环境因素主要有路径、树木的密度、环境的电磁干扰、建筑物、天气情况和地形差别等。这些因素和其他一些参数直接影响信号的场强和覆盖范围。
3、其它影响因素
(1)电池电量不足。当电池电量不足时,通话质量会变差。严重时,会有噪音出现,影响正常通话。
(2)天线匹配。天线的频段和机器频段不一致,天线阻抗不匹配,都会严重影响通话距离。对于使用者来说,在换用天线时要注意将天线拧紧,另外不能随便使用非厂家提供的天线,也不能使用不符合机器频点的天线。
4、音质的好坏
主要取决于预加重和去加重电路,目前还有较先进的语音处理电路“语音压扩电路和低水平扩张电路的应用”,这对于保真语音有很好的效果。

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