Quote:
Originally Posted by daryo
can you tell me : is the range of 30hz frequency good for treasure hunting ?(by metal detector-EM or any type of LRLs )
if used and will be good , what is it advantage from higher range of frecuency ?(20 khz)
if not ,where is used this range ? (which applications)
you know vlf means very low frequency , this is start from khz or hz ?
thank you
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Using 30Hz as working frequency, you will face with interference problems of mains power line (60Hz in USA 50Hz in EU).
Above 20kHz skin effect phenomenon begin.
VLF range is between 3kHz and 30kHz.
Probably you need ULF (range between 300Hz and 3kHz), then try with frequencies between 600 and 800Hz and simple Wheatstone bridge solutions.