汽车上的am按键指的是汽车收音机的波段。更多相关资料如下：汽车收音机一共有两种模式，一种是am，一种是fm，一般情况下车主在听收音机时，用fm按键比较多，因为fm是用来操作收音机的调频，am是用来调节收音机的波段。 汽车上am是收音机频段的表示。

一般来说AM频率的电台是相对于远距离传播的节目用的，其福射范围大，是长波。AM为535-1605KHz，我们称为调幅广播。FM则与之相反，其福射范围小，是短波。 AM叫做调幅 FM叫做调频 AM，FM是用来收听当地电台的广播。 FM、AM是根据频率对广播的一种分类方式。

A new modulation technique for AM broadcasting was demonstrated by industry pioneer Mike Dorrough at a recent meeting of SBE Chapter 43 in Sacramento. The Advanced Modulation System offers to increase ...

Belar Electronics has unveiled its latest innovations for analog and digital AM modulation, as the RF monitoring firm has completed its updates for its legacy AMMA-2. The company says this allows for ...

The Federal Communications Commission (FCC) in 2021 approved the FM band for use on CB radios – arguably the biggest change in decades, and one that sent radio suppliers back to the engineering room ...