PUBLIC ADDRESS SYSTEM

 

PUBLIC ADDRESS SYSTEM

GENERAL: 

A. The Contractor will outfit and introduce all hardware, adornments what's more, material needed for the establishment of the predefined frameworks.Any material and additionally gear essential for the legitimate activity of the framework not indicated or portrayed in this will be considered piece of these details. The gear depicted and outfitted under these particulars will be the standard result of one of the satisfactory producer 

B. Sound/paging framework will comprise of however not restricted to the accompanying : twofold tape player, smaller plate player, equalizer, computerized commentator, CD player, program selector, a focal control/appropriation rack with blender intensifier, power enhancer, roof and divider mounted boisterous speakers, mouthpieces, speaker select unit, blower board, screen board and intersection board. Sound framework hardware will be given maker's standard bureau rack. 

C. Give total drafting public location framework as demonstrated on drawings. Public location framework will give crisis prerecorded declaration to different structures if there should be an occurrence of fire. Number of amplifiers will be appeared on drawings. 

D. Force Amplifier: 

1. Speaker will be Class An and ABI, with push-pull or push-pullparallel yield and negative criticism to get low mutilation what's more, guideline with high solidness. 

2. Recurrence reaction will be level give or take 1 db between 50 and 15,000 cycles. 

3. Force enhancer will be finished with on-off switch, essential intertwine, 127 volt AC supply, and tapped yield transformer; limit will be as demonstrated on the drawings or as required.

E.Mixer Pre-Amplifier:

 - Frequency range 50Hz to 1500Hz 

 - Distortion less than 1% 

- Transformer isolated and balanced line output of 600 ohms and 1V

 - Adjustable muting level - 

12 inputs and associated individual side volume controls 

- Operational on 24V DC supplied from accompanied power supply unit 

F. Junction Panel: 

1. Shall be manufacturer's standard rack mountable with following characteristics: 

- Switched outlet controlled by front panel power switch relay, or by shorting rear POWER REMOTE terminal

 - LED Power indicator - Terminals for connection of protective circuit breaker

 - Operational on 24V DC G. 

Monitor Panel: 

1. Shall be manufacturer's standard rack mountable with following characteristics: 

- Aural/visual monitoring for multi-channel sound and program systems (up to 10 power amplifiers) 

- Controls shall include channel selector switch, volume control, watt meter and line voltage selector switch 

H. Blower Panel:

 1. Shall be manufacturer's standard rack mountable with following characteristics: 

- Efficient forced air cooling

 - Starts when rack temperature reaches 48°C and stops at 38°C

Speaker Selector: 

1. Shall be manufacturer's high quality rack mountable with following characteristics:

 - Press to speak button 10 individual selector switch

 - 1 All-call switch with remote control facility 

- Up to 200W 

- 1 All-call switch and auxiliary shunt switch available by using relay

J. Force Supply: 

1. Will be producer's norm with following attributes: 

- Output DC 24V DC 

- AC mains, 50/60Hz 

K. Noisy Speakers: 

1. Noisy speakers will be given where appeared and will be of the top notch perpetual magnet type. Speakers will adjust to EIA, SE-103, and RS-278-A. Noisy speakers will be roof mounted sort speakers, and will be introduced as appeared on the drawings. Worker for hire will ensure that area and force of speakers will bring about non-reverberation uniform discernible signs. 

2. All metal parts will be cadmium plated and measurements and mounting openings will adjust to EIA Standards. 

3. Recurrence reaction will be basically uniform over a band 

of 80 to 15,000 cycles. 

4. Affectability will not be under 92 db give or take 3 db over 

the recurrence band determined at 1200 mm for 1 watt input, 

limit as appeared. 

L. Amplifier: 

1. Amplifier will be of the dynamic, low-impedance, unidirectional sort intended to give high front-to-back victimization undesirable sounds without close-talking boominess. Receivers will adjust to EIA, SE-105; limit as demonstrated on the drawings. 

2. Development will be such to create a cardiod design. 

3. A change will be given to impact a shifting of the receivers from a vertical situation of 45°C to the vertical. 

4. The receiver mounting will be tapped 16 mm to 27 for female mike string.

5. The microphone shall have a frequency response from 50 to 15,000 cycles plus or minus 5 db with an output level not lower than minus 58 dbm. 

6. Component parts shall comply to the requirements of the Standard Test Method of EIA, RS-186-C. M. Sockets: 1. Sockets shall conform to EIA, RS-167-B, RS-168, RS-168-1 and TR-111-A, as applicable.