NE555μA7412N1086
Homemade library ground wave TV double ring indoor antenna: The received ground decimeter wave frequencies are currently in the 500-800 MHZ frequency range. If there is a good field strength in the urban area, low frequency and high frequency should be taken into account. This is the best resonance; The frequency center is around 700MHz, which is converted according to the radio propagation speed and frequency. If the center frequency wavelength is about 42cm, then the diameter of the ring antenna should be 13cm, that is, the diameter should be a quarter of the center frequency wavelength of about 42cm. If we think of a 42cm conductor as a ring with a central frequency and wavelength of 42cm, then its diameter should be close to 13cm. If we make a good antenna, we can get twice the result of receiving ground waves with half the effort!
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