US Navy Handsets for Radio Communications

Page with Lots of  Info on Sound-Powered Phones 

NT-23172 Radiophone set
(4-wire)
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ctl-23172-02.jpg (3161256 bytes) See here for spec sheets

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NT-23211 Radiophone unit
(6-wire)
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NT-23211 Radiophone Set
(6-wire)

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NT-51007 & NT-51007A communications handsets

could be upgraded to dynamic mike (gray color)

Has carbon microphone unit

CVI-51007A- not original connectors
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Handset Field Change - April 1960 BuShips Journal
By Fred Chapman - Communications Branch, Bureau of Ships

A field change kit (Field Change 1-51007A) to improve audio fidelity for high-quality speech transmission and reception is now available through the Naval Supply System.

Recently the Bureau procured a limited quantity of field change kits for the standard Navy communications handset NT-51007A. The kit, Federal Stock Number 5820677-9263, contains a replacement dynamic receiver earpiece, receiver cap, replaceable transmitter (microphone) cartridge, microphone retainer ring, Instruction Sheet (NAVSHIPS 93387), and Field Change Bulletin (NAVSHIPS 981138).
The replacement units are colored light gray to identify the modification to that of a dynamic-type handset. The removed carbon microphone unit and magnetic earphone may be retained on board for possible emergency use.
Through the addition of this field change, the 51007A handset will provide added communications reliability. The unit is intended primarily for use at Radio Set Control C-1138/UR (or equivalents) that are used on single sideband circuits that contain equipments such as the AN/URC-32 or AN/WRT-2. The modified handset may be used with any standard Navy communications equipment since the output circuitry and impedances are the same as the original carbon unit.
The microphone unit contains an encapsulated, non-repairable, transistor preamplifier and includes sound chambers that function as an extraneous noise-canceling device. The noise-canceling feature eliminates all other outside sounds other than that of the person speaking directly into the microphone. The transistor preamplifier is operated from the negative 12 volt d.c. power normally supplied from the associated control unit or transmitter. The circuitry contains protective provisions in the event of the application of 12 volts direct current with a reverse polarity.
When a unit becomes defective, it must first be assured that a 12-volt direct current of proper polarity has been applied; and if so, the unit must be discarded. Replacement microphone units will be stocked in the Naval Supply System under Federal Stock Number N5965-6244134.
Because of budget limitations, only a small supply of the field changes could be obtained during fiscal year 1960.
Complete handsets being supplied with radio set AN/URC-32 and transmitter AN/WRT-2 have the nomenclature H-169/U. These handsets are essentially the 51007A type with the field change applied. The units are colored gray completely for identification. The Bureau is procuring similar dynamic boom-type headset assemblies H-172/U (Federal Stock Number F5965-715-4031) to replace chest sets now in use.
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NT-51008 communications handset assembly - part of NT-50064 speech equipment used with TBL transmitter

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CME-51008
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NT-51011 Chest Set  - part of NT-50064 speech equipment used with TBL transmitter

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NT-51019 handset

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NT-51026 handset
(for TCP-2)

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H-169/U communications handset

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Direct replacement for  NT-51007A

Has transistorized dynamic microphone unit
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H-172/U boom-type headset
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transistorized dynamic mike and cushioned earpieces

replaces chest sets

H-172/U Spec Sheet

need better photo

Please send me e-mail if you have one of these headsets for sale or trade

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H-200/U sound-powered headset-chest set
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H-203/U Sound-powered handset

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SAS - Single Audio System - for secure switching of voice channels

SA-2112(V)4/STQ Switching Matrix 
(Coke Machine) aboard BB-61
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TA-970/U Red Phone - for connection to SAS

Handset H-342/U is used in TA-840A/U, TA-970/U, TA-980/U and
TA-990/U systems

I need a manual - please send e-mail if you can help

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TA-970/U Secure Telephone Set for use with all SA-2112, C-10315, and VCS-150 Red Switch applications.  Tempest certified and shipboard ready.
Complete phone set includes handset and chassis.

The TA-970/U, TA-980/U and TA-990/U telephone sets are used primarily in shipboard installations of the Single Audio System (SAS), which provides voice communications in both plain and cipher modes. They are an integral part of the ship's exterior communications system. The TA-970/U provides single-channel voice communications and control capability from below-deck (protected) shipboard spaces.

Functional Characteristics
Power Requirements: +24 vdc 10% at 250 mA
Input impedance: 470 ohms 10% at 1000 Hz unbalanced
Output impedance: 600 ohms 10% at 1000 Hz balanced
Microphone frequency response: 4 dB from 200 Hz to 4000 Hz
Receiver frequency response: 6 dB from 200 Hz to 4000 Hz
Output signal level: -20 dBM avg., 0 dBM peaks or 6 dBm avg., + 14 dBM peaks
Distortion: one percent maximum
Capabilities
Noise canceling: Noise canceling features of microphone provide high articulation in the presence of high background noise.
Loudspeaker: Control of loudspeaker muting provided.

SA-1997/U Switch Box - for routing telephone sets to secure voice channels
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sa1997-u-1502-06.JPG (36949 bytes) sa1997-u-1502-07.JPG (22292 bytes) sa1997-u-1502-08.JPG (24011 bytes)  SA-1997/U Specifications