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A few things are worth mentioning. First of all there is no modulation input for this transmitter, so it's just ,,shooting blank'' and will probably be suitable only for experiments rather than real transmission, since an appropriate antenna for this will be 300m long dipole. I guess at 1/4 wavelength you can get it down to 75m but it's still unfeasible. The second thing worth mentioning is that this is illegal. The range of this thing can vary from a few km, to a few hundred or even thousand km, given the right conditions and antenna. At least the output is harmonic free. The good thing is that you can use any transistor you want. Even a BD139 would do an excellent job. Just use a transistor with a power rating of no less than 10W. If you want some form of Amplitude Modulation, you can try using the emitter somehow as the input for the audio signal but i haven't tried yet
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