T.S. STATE OF MAINE

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T.S. STATE OF MAINE

• Sound Powered Phones

Waldo P. Harmon Certified I.C. Specialist Ships
Electrician
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A phone system that needs no external power source

• TWO (2) Independent circuits
• SOUND OPERATED
• Talk Listen Communication Circuit
• VOLTAGE OPERATED (Magneto generated voltage)
• MAGNETO small hand cranked electric generator
  (AC - 96 volts)
• Selector Bell Circuit

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Talk Listen Circuit

• Handset
• Consists of Earpiece Mouthpiece
• Has Pushbutton to connect it to the circuit
• Headset
• Consists of Ear Muffs Mouthpiece
• Ear Muffs are always connected to the circuit
• Mouthpiece has pushbutton used to connect the
  mouthpiece when you talk

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Principle

• Two cans connected by a single wire
• Speak into one can, the bottom vibrates and the
  sound wave travels along the wire causing the
  bottom of the other can to vibrate, duplicating
  the original sound
• Your ear/brain can decipher the sound wave (Sine
  Wave) reproduced
• SP Handsets or Headsets AMPLIFY the sound
• Using two (2) wires and either CANTI-LEVER or
  CARBON-GRANULAR technology to react to your
  voice.

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Canti-Lever

• This matches closely the old can bottom
  technology
• A diaphragm vibrates causing a lever to move back
  and forth between the magnets
• This creates an electrical Sine Wave
• MUCH HIGHER AMPLIFICATION results
• This is basically old and seldom seen today!

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Carbon Granular

• Modern style (TSSOM has this type)
• Vibrations from your voice
• Shakes, loosens and or disturbs the carbon grains
  in the magnetic field
• Results in a resistance change
• In turn a voltage variation now develops the SINE
  WAVE
• AGAINAMPLIFIED Sine Wave capable of traveling
  down the wires between the connected devices

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OPERATING Handset

• This is a COMBO device consisting of
• IDENTICAL
• Mouthpiece and earpiece in a handset style
• PUSHBUTTON
• Used to connect the device to the circuit.
• IMPORTANTKEEP IT PUSHED AT ALL TIMES
• It simply connects the device to the circuit and
  does not have any other function
• Push the button and you can HEAR/LISTEN or SPEAK
• Equally IMPORTANT
• A quiet environment helps you to hear and others
  to understand what you are saying

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HANDSET Trick

• Remember
• The earpiece and mouthpiece are identical
• IF you suspected the mouthpiece was defective you
  can
• TALK /SPEAK into the earpiece and the person(s)
  on the other end will hear you.
• You MUST keep the button depressed to stay
  connected
• You must return the earpiece to your ear to
  listen
• This works.try it youll like it!
• You now know more than 90 of the people who use
  sound powered phones!

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Headset

• Consists of Earmuffs
• These are always connected when plugged in.
• Being muff style they exclude exterior noise
  making it easier to hear.
• Also have a breastplate style Mouthpiece
• The mouthpiece has an integral pushbutton used to
  talk/speak
• Has a strap for your neck to hold the breastplate
  in the proper orientation for you to depress the
  button and speak into it

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TALKING

• The LOUDER you speak into the mouthpiece the more
  voltage/current is generated and transmitted to
  the other end device.
• TRANSMITTER to RECEIVER(s)
• Multiple persons can be on the same circuit and
  as long as they have their button depressed
  keeping them on line they will hear what is being
  said by anyone talking. (Earmuff style always
  hears)
• CAUTION
• DO NOT HOLLER (Shout) (over modulation results)
• This will cause voice DISTORTION with too much
  amplification
• Loud is goodTOO LOUD is not good

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USEFUL hints

• Speak DISTINCTLY that is CLEARLY
• Loud but not too loud
• Slowly but not too slow
• DO NOT Whisper
• DO NOT MumbleEnunciate!
• Keep tone, volume and rhythm of speech right
  through till the endDO NOT Die-Out! (Drop your
  volume at the end)
• Try to be in a QUIET area. This helps hearing
  and speaking.
• THINK of the others on the circuitThey MAY be in
  a very noisy area.
• ABOVE ALLBe as brief as possible while insuring
  you convey the message that is needed by the
  others on the circuit.

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SELECTOR BELL CIRCUIT

• Some phone stations are equipped with
• Numbered Dials
• Hand Cranks
• Bells external or internal
• These stations and the associated dials and
  cranks
• will work whether or not you touch the dials or
  cranks
• They are always on if you simply push the button
  on the handset.

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SELECTOR BELL CIRCUIT Continued

• The whole purpose of this bell circuit is to
• Alert another station that you are on the circuit
• To use
• Dial the station number
• Wind the crank smartly
• The station you selected has an installed bell
  that will ring alerting that station that someone
  is on the circuit and wishes to talk
• Want a third or fourth station to be alerted?
• Simply select that station and again crank
  smartly.
• Do this for all the stations you want alerted.
• REMEMBER bell circuits have nothing to do with
  the TALK function it is simply an alert.

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Additional accessories

• Amplifiers for external speakers.
• This allows groups of people in a space to hear
  what is being said on the circuit.
• Relays for lights, sirens, bells which may be
  powered by 110 volt or other voltages.
• This allows for alerts in noisy or large spaces.
  
• Hear Here booths
• These are located in noisy spaces so you can
  stick your head in to hear and talk.
• Remote jacks
• Allows for plugging in at remote locations or
  jacking headsets into phone boxes. These may or
  may not have any accessories attached.
• Selector Switches for voice circuits
• Allows for transferring call rings from one
  location to another. Example Bridge Wings

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QUESTIONS ?
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