USN Sound-Powered Talker
Posted 01 April 2007 - 04:31 AM
Ya know, it just occurred to me my talker's rig is missing the plug, too. Duh! http://www.usmilitar...tyle_emoticons/default/crying.gif
Posted 01 April 2007 - 05:56 AM
The plug is marked PL-58, and looks like this;
Hope this helps!
Posted 01 April 2007 - 06:32 AM
Posted 01 April 2007 - 08:06 AM
the jack you show is comaptible with the EE-8 field phones, if you have one look at the top end you will see three female holes to accept jacks, also comaptible with the signal corp BD-71 switch board among other things
Edited by dustin, 01 April 2007 - 08:09 AM.
Posted 01 April 2007 - 10:32 AM
thank you Dustin!
Talker helmet and com equipment came from the same source (out of the woodwork), so I assumed they fit together.
So as it stands, I'm looking for a set like QED4 shows?
Posted 01 April 2007 - 10:45 AM
there are other variartion that than of QED shows too some are USMC with a NOM contract.One thing to look for is a contract prefix NXSR-### that would be marked on the chest mic body, that would be the indication it is forsure WWII.The navy used these I belive into today so I cannot confirm QED is a WWII piece but looks close enough but most I have seen have the NXSR contract on them.
QED can we get a better look at the bakelite body and see spec. # that would help confirm...thanks! http://www.usmilitar...tyle_emoticons/default/thumbsup.gif
Edited by dustin, 01 April 2007 - 10:46 AM.
Posted 02 April 2007 - 09:51 AM
Posted 02 April 2007 - 01:13 PM
Posted 02 April 2007 - 02:31 PM
QED, yours looks good, the spec# is consistant with WWII era naval specification numbers.
Edited by dustin, 02 April 2007 - 02:32 PM.
Posted 02 April 2007 - 02:45 PM
The system Peace shows is actually an electric one, it has three prongs and copper electric wire. The sound powered ones use carbon wire and work on the same principal as a string and tin cans system and were used so if there was a power failure they would not lose communications.
The tin can and string thing worked by sending the can's vibrations down the tight string to the other can which would vibrate. That's a mechanical system but a sound powered system is electrical. Basically, in an electrical system the vibrations are sent along the wire as a pulsating voltage which causes the magnetic field in a speaker to vibrate the speaker cone/diaphragm. In the Navy's sound powered systems instead external circuits and power to generate the electrical impulses, the microphone does it all.
There's a wikipedia article about this and as they note:
"The headset microphone transducer converts sound pressure from a user's voice into a minute electrical current, which is then converted back to sound by a transducer at the other end. The number of simultaneous listeners is limited because there is no amplification of the signal. The distance between phones is also limited, however, successful testing shows that two handsets can communicate successfuly over 30 miles of 18AWG copper wire as shown during testing at Hose-McCann Communications in Deerfield Beach, Florida"
Standard electrical wire is used with sound powered systems, but the microphones are carbon mikes, the only ones capable of generating an electrical impulse on their own.
Posted 03 April 2007 - 06:19 AM
Posted 05 April 2007 - 02:15 AM
I recently retired from civil service after 30 years working for the Navy. I wish I had paid more attention to the sound-powered system still in use to see if they had changed any from what these pictures show.
Posted 24 January 2008 - 07:52 PM
Thanks guys! http://www.usmilitar...tyle_emoticons/default/twothumbup.gif
Now we know what the darned thing looks like, anyhow.
Ahoy Sgt Brown,
That depends on your friends SP phone rig - there are 'small can' and 'large can' phones. Also, there are male WWII plugs & female (postwar to present) SP phones & plugs.
After WWII, USN Sound Powered phones changed from the male plug (which was easy to bend & damage) to a female plug. Basically, they just changed the direction of the connectors on the cords & sockets. Both work fine, but there are several manufacturers of USN Deck Talker sound powered phones.
This is the postwar plug on an ISC Telephonics Corporation SA-7C
Posted 24 January 2008 - 08:01 PM
I think I'll start a USN Sound Powered phone topic to show some examples that I have.
Posted 25 November 2010 - 08:01 PM
Posted 25 November 2010 - 08:29 PM
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