GnuRadio, VLF, Metal Detecting

GNU Radio
1

Hi there, Im gls and I just registered. Sorry for my english.

Im thinking about a sort of linux laptop converted in a vlf metal
detector
using GnuRadio and is internal soundcard connected to a coil/sensor and
if
necessary a preamp… Do you know of someone that have tried this
experiment? Can you help me with suggestion, link, code or whatever?

Thanks in advance, excuse me for the strange question. I hope to receive
help :slight_smile:

2

Hi,

Check :
http://www.nuggethunting.com/detector_technology.htm

I Think most of these technologies can be exploited with USRP + [LFTX
DC-30
MHz Transmitter & LFRX DC-30 MHz Receiver] daughterborads.

Firas

Giuseppe Luca Scrofani wrote:

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3

Thanks Chris, and the idea of a coils array is great!

Thanks for the link Eng. Firas :slight_smile:

My idea is to generate 100 pulses at 6000 Hz per second for a duration
of
1/200 second (this values are not absolute and it should be easily
changed).
Betwenn pulses, the script have to “switch” from this “transmission
mode” to
“receive mode”, registering through an antenna + amplifier the presence
of
signal from the eddy current generated in the metal objects during the
tx.
If there is a “bouncing” signal, there is metal, if not, nothing to dig
:smiley:
A simple sound card in my opinion can manage this freqs.

Therefore:

TX

every second from a gnuradio .py script 100 pulses its generated, this
signals from the aux line is first externally amplified, then
transmitted
from a coil/antenna

RX

100 times every second after every pulse the same script, from another
amplifier and coil/antenna connected to mic in line, analyze the
radiowaves
in search of a 6000 Hz “bounce”

What do you think? Can you help me with the base of the code for a quick
start? I’ll share my achievements

PS: Sorry for my english :smiley: