Heavy signals like electrical storms and powerful lightning can be received in those frequencies as crunching, whistling crackling noises way before the thunderstorm strikes. It is just strong to be detected on a fairly short antenna. Such a signal is the dit-dah wave that is a slow and comes in two tone. There are a number of rare signals that is audible on frequencies below 15 kHz. Wireless and electrical frequencies in the atmosphere that are transmitted in the lower frequency range between 3 kHz and 30 kHz are known as VLF or very low frequency. This is where the proposed VLF converter circuit comes to aid. This typical tuning arrangement neglects a majority of the interesting and uncommon signals found below the standard broadcast band. A huge number of general-coverage shortwave receivers start with the AM-broadcast band and rise in frequency to around 10 meters, or 30 MHz.
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