- on Miscellaneous Electronics
- Published in issue 5/2007 on page 0
Signal hunting below 150 kHz
Mobile phones, Wi-Fi and satellite communications are increasingly making use of ever higher frequencies stretching up into the Gigahertz bands. That doesn’t mean that there is nothing interesting going on at the other end of the radio spectrum. We build a simple receiver and tune into some of the more bizarre signals in the extremely low frequency (ELF) domain.