During the early 2000s a group of free radio activists in Sao Paulo, Brazil, commissioned the construction of an FM radio transmitter with multiple frequencies to offer radio workshops to communities interested in learning about radio language and practice. The transmitter was used by groups across Brazil and several South American countries. This article aims to describe and analyse over ten years of radio activism, taking as the object of reflection the agencies provided by a transmitter built in a computer case and adjustable in four frequencies in each locality in which it was activated. Considering the parameters of the Brazilian law on low-power radio that permits, under federal concession, 30 meters of antennae with 1km of radius and 25w of power, the objective was to present an experience of direct appropriation of radio spectrum for freedom of speech. Here we intend to discuss the construction of social media through which people meet to maintain shared infrastructures and to create radio language, transforming aesthetic mobilisation into an effective alternative to the control of the mainstream media over the use of the radio spectrum. Beyond subjective criticism about its ephemeral and often innocuous role when compared to constituted media powers, this paper aims to demonstrate that handling radio-frequency equipment can be a useful pedagogical tool to support the collective maintenance and repair of household autonomous communication equipment and infrastructure, in order to criticise and propose alternatives to media consumerist behaviours in different technological environments and situations.

中文翻译：

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游牧发射机：巴西媒体行动主义中的公共领域和美学

在2000年代初期，一组免费的无线电活动家在巴西圣保罗委托建造一个具有多个频率的FM无线电发射机，以向有兴趣学习无线电语言和实践的社区提供无线电研讨会。该变送器已被巴西和几个南美国家的团体所使用。本文旨在描述和分析十年来的放射性行动，并以反射的目的为例，由内置在计算机机箱中的发射机提供的代理机构可以在激活它的每个位置以四个频率进行调整。考虑到巴西低功率无线电法的参数，在联邦政府的允许下，允许使用30米长，半径为1公里，功率为25w的天线，目的是展示一种为语音自由直接分配无线电频谱的经验。在这里，我们打算讨论社交媒体的构建，人们可以通过社交媒体聚会以维护共享的基础设施并创建广播语言，从而将审美动员转化为控制主流媒体对无线电频谱使用的有效替代方案。除了主观批评它与构成媒体大国的短暂作用和通常无害的作用外，本文旨在证明处理射频设备可以是一种有用的教学工具，以支持家庭自治通信设备和基础设施的集体维护和修理，