The transmitter uses a well-known module manufactured for some years now by Aurel as their ‘FM audio transmitter’. It works in the licence-free 433.92 MHz band and so allows our project to operate completely legally as the transmitter is type-approved to quite strict technical specifications. Note however the frequency you’re using is not exclusive as it is shared by many other wireless devices such as headphones and key fobs for garage doors and so on. The equipment is low-power however and should have a short range. The Aurel module is a complete FM audio transmitter designed for powering from 12 V.
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