It has no variable capacitors or inductors except for one preset trimmer in a trap circuit. The receiver design is a little different from the usual form. The VLF and LF bands have their own unique useful characteristics and these will be discussed further on. It has been designated a VLF-LF receiver, because it tunes the VLF-LF range from 10 to 300 kHz, but it also tunes part of the MF spectrum from 300 to 500 kHz. The superheterodyne receiver described is the result. Likewise, the writer had no receiver which could tune these frequencies and set out to design a simple receiver for just that purpose. Home - Techniek - Electronica - Radiotechniek - Radio amateur bladen - Amateur Radio - A VLF-LF receiver - 10kHz to 500 kHz with resistance tuningįew communications receivers tune to frequencies below 500 kHz and because of this, many radio enthusiasts are unfamiliar with this section of the radio frequency spectrum which supports numerous radio services.
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