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TYPE 50064 SPEECH INPUT EQUIPMENT

TYPE 50064 SPEECH INPUT EQUIPMENT

Use.-Voice modulating TBL series.

Description.-The Navy type 50064 speech input equipment is designed for use in conjunction with Navy models of the TBL series transmitting equipments and associate models RAA RAK, RAB, RAG, RAH, RAL receiving equipments.

The speech amplifier is designed to he mounted on a table. All the controls and the chassis are built onto the front panel, which is hinged to the bottom of the cabinet and may be sung out for servicing purposes.

Two hand set telephone units are supplied: One set supplied is fastened to the top of the speech amplifier unit, but may be detached if desired and mounted on the table used to support the latter unit . The second telephone assembly may be mounted on any horizontal or vertical surface at a remote location.

The chest microphone assembly is of the single-button carbon type and is equipped with a plug-terminated cord designed to be inserted into a jack located in the speech amplifier unit .

The receiver input attenuator units, enclosed in aluminum boxes, are designed to permit an operator to adjust the input to his receiver from a nearby transmitter so that the audio levels resulting from the nearby transmitter signal will be the same as those from a more distant transmitter operating at the same frequency. One of these units must be installed or case of each receiver employed in conjunction with a model TBL series transmitter used in radio telephone operation.

TECHNICAL FEATURES

Design. -Navy.
Audio power.-3 watts in 500-ohm load.
Power.- Supply 110/1/60. Required : 125 watts. Allowable variation in supply line voltage +- 10 %, frequency +- 5 %.
Input impedance.- 600/200 ohms
Output impedance.- 500 ohms.
Overall frequency response.- 300 to 3,000 cycles with +- 2 db of 1,000 cps. value.
Modulation capability.-Up to 85 percent
Type of control.-Front of panel. Controls TBL transmitter by means of standard Navy 4- or 6-wire control circuit.

                Tube complement
                                       | Number   | New type
Location                               | of tubes |  No.   
First stage                            |   2      |  6D6
Second stage                           |   2      |  2A3
Limiter rectifier                      |   1      |   84
Power rectifier                        |   1      |  5Z3
Total                                      6

     Weights, dimensions, and Navy type numbers of
          equipment units included in contract
          Unit           Type Nos. | Height |  Width|  Depth  | Weight
                                   | Inches | Inches| Inches  | Pounds
Speech amplifier       | CRV-50055 |  16    |  16   | 15 13/32| 77    
Handset assemblies (2) | CRV-51008 |   5    | 11 3/4|  3 3/8  |  4 3/4
Chest microphone assem-|           |        |       |         |
 bly                   | CRV-51011 |        |       |         |  2  
Receiver input attenua-|           |        |       |         |
 tors (2)              | CRV-29017 | 5 3/4  | 4 1/4 |  4 3/4  |  3 3/4
Spare parts and tubes  |           |        |       |         | 14

         Shipping weights and dimensions
                               |                  | Gross  |  Cubic
             Unit              |      Size        | weight |  feet
Speech amplifier, handsets and |     Inches       | Pounds |      
  chest microphone             | 22.5 x 20 x 25   |  134   |  6.55
Receiver input attenuators     | 18.5 x 10.5 x 11 |   21   |  1.32
Spare parts and tubes          | 21 x 15 x 11     |   34   |  2.21
      Total                    |                  |  189   | 10.08

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