[Milsurplus] [MRCA] [MMRCG] Shipboard Damage Control Communications

[Glenn Little WB4UIV]

Looks like the MJ circuit we used on the submarine.
The box had a selector to select what station to call.
Select the station and turn the hand crank that was attached to a magneto.
This caused the growler on the selected station to growl alerting the 
watchstander that there was a call.
Communications were via sound power phones.
Very reliable.

Glenn ETCS(SS) USN Retired


On 9/26/2023 3:37 PM, MARK DORNEY via MRCA wrote:
> Could be sound powered. The crank is attached to a magneto that in turn powers a ringer.  Idea behind a sound powered phone is to provide a means of voice communication if the ship lost all power. In the Army, they provide a nice, light weight means of voice communication.  The WW2 issue T-10 did not have a ringer - both a blessing and a curse. Both ends require an operator to constantly monitor the phone, but also eliminated any forward position from a ringer giving away a position. The Vietnam vintage TA-1 had a ringer, but was limited in that any splicing in the phone lines significantly cut down transmission signal.
>
> Mark D.
> WW2RDO
>
> “In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson
>
> Sent from my iPhone
>
>> On Sep 26, 2023, at 3:10 PM,mstangelo at comcast.net  wrote:
>>
>> Nick,
>>
>> Interesting reading.
>>
>> We periodically take a trip to Delaware via the Cape May-Lewes ferry. I like to stand on the upper deck beneath the bridge. The last trip out was foggy. I noticed when the fog rolled in a crewman was stationed at the front (is it called bow on a ferry) of the boat. When he observed a buoy or a ship close by he opened a phone box, took out a handset, turned a crank and spoke into a handset. Even though the ferry has radar and GPS I've wondered if this was standard or they were testing the phone and if this was a sound powered phone.
>>
>> I've attached a jpeg of the phone. It has a bell on the top.
>>
>> Mike N2MS
>>
>>
>>> On 09/26/2023 2:29 PM EDT Nick K4NYW<navy.radio at gmail.com>  wrote:
>>>
>>>
>>> Thanks to Hue W7HUE, I have posted a document covering shipboard damage control communications (probably WW2). In case you've wondered how sound-powered phones are used, this makes interesting reading. Even if if you haven't wondered that, it makes interesting reading. 15 pages, typewritten.
>>> https://www.navy-radio.com/manuals/ic-damage-control.pdf
>>>
>>> Nick England K4NYW
>>> www.navy-radio.com  (http://www.navy-radio.com)
>> <Cape-May-Lewes.jpg>
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIVwb4uiv at arrl.net     AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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