>
> I appreciate the responses, however it became a discussion as to whether the 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 Khz.  Thanks for any help or ideas.
> Thanks,
> FJ
>
>
>> From: boattow@spam@hotmail.com
>> To: piclistRemoveMEmit.edu
>> Subject: [EE] How to receive submarine signal?
>> Date: Mon, 2 Jan 2012 22:12:27 -0600
>>
>>
>> Hi all,
>> I have a question for those analog engineers on the list. I have been searching the internet for information on listening to ELF signals. I have found some information but not exaxtly what I'm looking for. For example one site has a circuit of amplifiers and passive filters utilizing either an antenna 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 listen 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 appreciated.
>> Thanks,
>> FJ
>>
>> http://www.vlf.it/kurt/elf.html