Communication helmet ШШ-1

Шлемофон ШШ-1
Шлемофон ШШ-1

Communication helmet ШШ-1 is intended to provide communication between objects with increased noise level, protect against external noises and climatic factors as well as against impacts on the vehicle construction parts. Used together with equipment of internal connection and commutation АВCК-1, P-174, P-174T, intercommunication system P-124 or similar equipment.

 

The communication helmet ШШ-1 consists of the following parts:

  • helmet which represents a headwear covering the entire head surface except for face;      
  • noise protection gear which is built into the helmet and consists of two headphones connected serially and two throat microphones;
  • cable with four-pin plug (for joint operation with intercom system P-124) or five-pin plug (for joint operation with equipment of internal connection and commutation АВCК-1, P-174, P-174T) using which the communication helmet  is connected to push-to-talk switch. Push-to-talk switch is intended to switch the radio set from reception to transmission, send  circular call and accelerate the voice frequency signal.

 

 

The сommunication helmet is manufactured in two versions: summer version and winter version.

Each version is manufactured in three sizes (І, ІІ, ІІІ). The helmet size number corresponds to human head dimensions:

Size No.

Human head size,

 cm

% rate of sizes

 when order

I

Up to 56

30

II

57-59

50

III

60-61

12

 

The сommunication helmet remains serviceable:

  • at an ambient temperature range from minus 50 ˚С to + 50 ˚С;
  • at a relative ambient air humidity not higher than 98% at the temperature of +25˚С;
  • under vibration loads within the range of 10-80 Hz at the acceleration of 29,4m/sec2 (3g);
  • under impact loads with acceleration of 735 m/sec2 (75g) with pulse durability from 0,5 to 2,0 msec;
  • under the exposure to acoustic noises up to 135 dB;
  • under the cycle changes in temperatures from minus 60˚С to + 70˚С;
  • under the exposure to hoar-frost and dew;
  • under the conditions of lower atmosphere pressure (6х104 ± 4х103 ) Pa ((450 ± 30) mm of mercury column).

 

 

Technical characteristics

Basic parameter denomination

Norm in accordance

with technical

requirements

Speech intelligibility under acoustic noise conditions up to 135 dB, not less, %

90

Noise suppression factor at the frequency of 1000 Hz, not less,dB.

13

Throat Microphones’ total resistance to noise under acoustic noise conditions up to 135 dB, not less, dB

16

Electrical resistance modulus of a pair of throat microphones at the frequency of  1000 Hz, Ohms

80±16

Electrical resistance modulus of a pair of telephones at the frequency of 1000 Hz, Ohms

520±104

Optimal level of voltage supplied to the telephones, V

5 – 8

Speech Efficiency of the communication helmet throat microphones, mV

0,5 – 0,8

Weight of the communication helmet, not more, kg

1,1