By the way what is the bandwidth? :-)


At 05.12 2012.01.03, you wrote:
>
>Hi all,
> I have a question for those analog engineers on the list.  I have=20
>been searching the internet for information on listening to ELF=20
>signals.  I have found some information but not exaxtly what I'm=20
>looking for.  For example one site has a circuit of amplifiers and=20
>passive filters utilizing either an antenna or just probes stuck in=20
>the ground to receive ELF signals below 50Hz.  Another person has a=20
>very large coil of wire wound on a spool and just sets it on the=20
>ground.  What I would like to do is similar but I'd like to listen to=20
>76Hz which is the US submarine communications frequency.  The Russians=20
>utilize 82Hz.  Is it possible to build a circuit that would pickup the=20
>76Hz signal only?  Any information on how to do this if it is possible=20
>is appreciated.
>Thanks,
>FJ
>=20
>http://www.vlf.it/kurt/elf.html 			   		 =20
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