Re: [PSUBS-MAILIST] retractable buoy

[Jon Wallace <jonw@psubs.org>]

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.






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