Stránka:roll 1948.djvu/102

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RADIO

Make a simple crystal radio set, and log at least 6 sta- tions. Make a regenerative tube set (one or more tubes), and log 12 stations. Either for coup: both for grand coup. 11 Make a multi-tube set (4 or more), using radio fre- quency amplification. Wind the coils for any of the above sets constructed. Either for coup; both for grand coup. II Know and be able to explain at least 24 common sym- bols used in radio construction. Make a chart and explain. Draw a diagram, and use it in building a successful crystal set. Either for coup; both for grand coup. II Construct a workable speaker unit of magnetic type. Construct a successful unit for cone type. Either for coup; both for grand coup. II Build a complete radio cabinet with built-in horn of expotential type. Build a complete radio cabinet, and mount a dynamic speaker in same. Either for coup; both for grand coup. II Build a successful B battery eliminator. Build a suc- cessful A battery charger. Either for coup; both for grand cou . Build a spark coil transmitter for C.W. transmission. Know the Morse or international code for use with the same. Obtain an amateur license to operate a transmitting station. Either for coup; both for grand coup. III 101