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To: <rsgb_lf_group@blacksheep.org>
References: <528F9257.18289.6F4B5D1@mike.dennison.ntlworld.com>
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Date: Fri, 22 Nov 2013 10:51:13 -0700
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Subject: LF: RE: Submarine comms
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Mike,

I have a mix of practical, theoretical and scientific knowledge on this
subject, but would not consider myself a leading expert. Judging from =
the
questions that you listed and the proposed rough-science experiment (I =
have
performed such experiments and the associated modeling and analyses), I =
can
probably provide some or most of what BBC would want. There are few
open-literature publications covering this subject, but I happen to have
some of them, and BBC might appreciate these for citation purposes.

73,

Jim AA5BW

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Mike Dennison
Sent: Friday, November 22, 2013 10:20 AM
To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk
Subject: LF: Submarine comms

I have received the following from the BBC. Does any member of this =
group
have direct practical or theoretical knowledge of VLF submarine comms =
and
would be able to help? Please reply direct to me at:
mike.dennison =3Dat=3D ntlworld.com

"BBC Coast is  making a short film about submarines.

"As part of the piece we would like to explain how communications =
worked.
How were messages sent from shore to the submarine?

"I know you specialise in  low frequencies,  and I=B4d very much like to =
have
a chat with you about the principles involved in undersea comms.
Specifically about  VLF ( very low frequency) transmissions.

"We also hope to set up a `rough science=B4 experiment which would help
explain how/ why VLF is able to penetrate water.

"Unfortunately we are up against a tight deadline, and need to film the =
item
during the first week of December."

Thanks
MIke, G3XDV