I decided that it would be fun to see what columnists were writing about fifty years ago so I dug into my collection of Flying Model magazines. Ted Strader wrote the "RC Channel Chatter" at that time and a glance through those issues revealed some very interesting things. In the February 1957 issue Ted printed the following memo from Dr. Walter A. Good. "It has come to the attention of the AMA R/C Committee that a dangerous type of transmitter modulation is being used by some modelers. This type of modulation employs a buzzer operating directly into the grid of the crystal-controlled transmitter. The danger is caused by the fact that a buzzer modulated transmitter may radiate on many widespread frequencies in addition to 27.255 mc."
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机译：我认为，看看五十年前的专栏作家在写些什么会很有趣，所以我钻研了我的《飞行模型》杂志集。特德·斯特雷德（Ted Strader）当时写了《 RC Channel Chatter》，对这些问题的一瞥便发现了一些非常有趣的事情。在1957年2月的一期杂志中，Ted印刷了Walter A. Good博士的以下备忘录。 “ AMA R / C委员会已经注意到，某些建模人员正在使用一种危险类型的发射机调制。这种调制采用了直接在晶体控制发射机网格中运行的蜂鸣器。这是由于蜂鸣器调制的发射机可能会在27.255 mc之外的许多广泛频率上辐射而造成的。”
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