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But if you want , Braga’s book remains excellent. 8. Safety & Legal Final Checklist ✅ Use only with a dummy load or severely attenuated antenna (e.g., 40 dB pad) ✅ Never connect to mains – run on batteries (9V or 12V) ✅ Do not transmit on aviation, emergency, or cell bands ✅ If using a spectrum analyzer or SDR, check for harmonics > –40 dBc Would you like a sample investigation log template or a modern parts list for the first FM transmitter project from the book?