Well done David.
Keep those innovations coming.
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of David
Bartsch
Sent: 15 October 2008 05:31
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] major milestone!
To all...
On my short drive home from work this morning, I was pondering how with
but a single communications console in working order I could transmit and
listen to the newly made voice transmitter...
Franks unit is completed but lacks a mode switch override switch. What
this override switch does is override the mode switch and allows for
transmit and recieve functions at the same time. The reason for this mode
switch in the first place is that during times when voice transmissions are
being made, this switch cuts off the ability to hear to protect the listen
electronics from overloading and possable damage. A bypass switch is being
installed on later models to allow the use of two passive hydrophones one on
each of the two electronic amplifier channels. This switch is to be off during
transmission operations.
What was done this morning, was I installed a simple jumper on
Franks unit to allow the use of both transmit and recieve circuitry at the same
time. I listened to both channels first to verify both were working order (Both
transmit and recieve use the identical electronics to perform each function)
Having been satisfied that both channels were indeed working, I lowered the
gain control on the lower channel I was to use to transmit and lowered the
volume control as well.
I installed a set of headphones in the upper channels output and
secured a passive hydrophone on the opposite side of my 18' diameter pool at a
depth of four feet. I installed this into the input of this upper listen
channel.
A simple speaker mike into the input of the lower channel and this
new voice transmitter into the output I then installed this voice
transmitter into the pool on the opposite side as the hydrophone and I was
ready to test.
It was clear, clean and loud! I have no doubt that this voice
transmitter can easily transmit voice messages over vast areas should it be in
open water! (This was on a very low gain setting too!) The coupling of this
device with the water accounted for very little sound energy having been lost in
the conversion from electrical signal to sound energy. (It is very efficient)
For the record books...Frank D's passive sonar/underwater
communications console was the first to both transmit and recieve broadband
voice communications data. (Although but a short 18')
I have since removed this jumper and restored Franks unit back
into a storage status awaiting the arrival of yet another sound transducer for
solids slated for delivery to him in Ca.
David Bartsch
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