I appreciate the responses, however it became a discussion as to whether th=
e US still used 76hz or how communications was being handled.  The US still=
 uses 76hz and the russians still use 82hz to communicate with submarines. =
 I do not want to receive and decode what is being communicated.  I have an=
 idea for use of the signal.  All I want to be able to do is to receive it =
and measure a signal level.  Any ideas how I can do this?  It's 76hz, not K=
hz.  Thanks for any help or ideas.
Thanks,
FJ
=20

> From: boattow@hotmail.com
> To: piclist@mit.edu
> Subject: [EE] How to receive submarine signal?
> Date: Mon, 2 Jan 2012 22:12:27 -0600
>=20
>=20
> Hi all,
> I have a question for those analog engineers on the list. I have been sea=
rching the internet for information on listening to ELF signals. I have fou=
nd some information but not exaxtly what I'm looking for. For example one s=
ite has a circuit of amplifiers and passive filters utilizing either an ant=
enna or just probes stuck in the ground to receive ELF signals below 50Hz. =
Another person has a very large coil of wire wound on a spool and just sets=
 it on the ground. What I would like to do is similar but I'd like to liste=
n to 76Hz which is the US submarine communications frequency. The Russians =
utilize 82Hz. Is it possible to build a circuit that would pickup the 76Hz =
signal only? Any information on how to do this if it is possible is appreci=
ated.
> Thanks,
> FJ
>=20
> http://www.vlf.it/kurt/elf.html=20
> --=20
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