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Technical specifications
Max diameter cm 12
Length cm 109
Weight kg 13
Power supply V 24 / 12V (On demand)
Connections BNC F 2 (Power supply and signal Output)
Antenna Factor 100 pT @ 10 Hz - 2.2 mV rms (gain 0 dB e LPF ON)
Output gain 0/20/40 dB (respect to the antenna factor) selectable at the order
Low Pass Filter Hz 30 (On or OFF at the order )
Frequency range Hz 0.1 120 Hz (rolloff @ 1.3 Hz)  
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The Explorer E202 is a portable receiver of electric field VLF high sensitivity for radio signals of natural origin.

Frequency response with antenna supplied stylus: 120 Hz - 10 kHz, + / - 3 dB
Frequency response of low impedance: 3 Hz - 10 kHz, + / - 3 dB
Internal Power: 9V alkaline battery, with a duration of about 40 hours.
External power supply: 12 to 18 VDC (20 mA)
Protection against reverse battery polarity.
Protection against reverse polarity of the external.
Headphone output: impedance 33 ohms (headphones included)
LINE line with dual function: signal output to the line input of the PC signal input
if you want to use the receiver as a tester for other audio devices. The signal injected into the
LINE is returned amplified headphones.
Antenna input: 5 Mohm input impedance.

more indo at

The explorer is connected with a Marconi antenna and send signals at sound card of the IBM X333 Server
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FGM 03 Magnetic Field Sensor

Thursday, February 27, 2014, 6:15 PM

The FGM-X series of devices are very high sensitivity magnetic field sensors operating in the 50
microtesla range ( 0.5 oersted ). They are simple, essentially three terminal devices, operating from a
single +5 volt supply, the connections being ground, +5v and output. The output is a robust 5 volt
rectangular pulse whose period is directly proportional to the field strength, (giving a frequency which
varies inversely with the field), making it very easy to interface to a computer or micro controller. The
typical period swing for the full range of an FGM-3 is from 8.5 ms to 25 ms (~120 KHz to ~50KHz), a
clear indication of its high sensitivity. 
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Sunday, January 12, 2014, 11:49 PM

The rack is composed by five servers, Each one dedicated to a single service. A Dell Poweredge 2650 for Graves Radar, another 2850 for the FluxGate, one HP G3 for Graves correlation with Asia carrier, another G3 for SID and  finally a Dell 2850  backup and mirroring running FreeBSD  9.2 

Copyright 2008-2016. Claudio Re ( and Fabrizio Francione  ( rights reserved.