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Hello all In commercial radio we used hard
line that was nitrogen to 5psi and water proof connectors not sure how much
preasure it would take but you could stand on it without collapsing it, just a
thought Brian V. Ryder President Sub Atlantic Research &
Recovery Associates Inc. brian@subatlantic.com CONFIDENTIALITY NOTICE: This
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contact the sender by reply e-mail and destroy all copies of the original
message. From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jay K.
Jeffries Frank, Coax cable necessary to transmit and receive a radio
signal through is subject to compression due to depth. The insulation
between the signal wire and the outer shield is usually a foam, as it collapses
signal strength will fall off. If shorted, keying the mike on a radio can
cause the radio to be destroyed. When I was looking at working with the
tourist sub SubCat, one of the problem areas was a surface float for
maintaining VHF communications with the surface. It looks like both the
hull interface and the antenna cable were under constant need of repair.
This sub didn’t even dive very deep. R/Jay -----Original Message----- Frank, > How big and what type of cable would be required to
get a voice out of > a submarine. Someone with more electronics experience will hopefully
respond, but any communication over a wire (voice or data) has distance limits
determined by the type of cable and protocol used. The issue is
reflections within the cable over long distances and signal loss. For
example, twisted pair network cable has a limit of 100 meters without a switch
or router to retransmit network packets. USB cable has a recommended
limit of 5 meters without a powered hub to retransmit data. Antenna cable
(TV, CB, Marine) is usually recommended to be as short as
feasible. Get to 50 feet or so and in-line amplifiers are going to be
required for a better signal. |