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To: techdiver@opal.com
Subject: Re: Communications
From: "A.APPLEYARD" <A.APPLEYARD@fs*.mt*.um*.ac*.uk*>
Date: Wed, 12 Oct 1994 09:05:10 GMT

  Pekka R{ty <praty@vi*.hu*.fi*> wrote on Wed 5 Oct 1994 19:11:08 +0200
(GMT) (Subject: Communications):-
  > ... cordless UW communication systems ... OTS Byddyphone 2 and Divecomm
1000 systems. ... I have had a chance to try OTS BP2 in several dives to 140
ft. In area to 100 ft the system "look and feel" was that of  typical maritime
VHF. Having this UW was astonishing!
  > Below 100 ft we started to have whistling noises and disturbances in
Diver-to-diver communications. This may have been caused by SCUBA and could be
avoided (?). ...
  If these intercoms work on modulated ultrasound, remember: scuba divers'
intercoms aren't the only things in the sea that use ultrasound! Sonar,
government communications to and from submarines, whales and dolphins (for
communication as well as for navigation).
  PS to Pekka R{ty: the second letter in your surname in your message's From:
line (probably intended as a Finnish umlaut letter) appears as a left curly
bracket on most ordinary ASCII PC etc screens.

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