bids are invited for lapel mic lapel mic common parameters =================== 1 frequency range: 60 hz- 18khz 2 signal-to-noise ratio: >90db 3 thd: 1% 4 max. spl: >120db 5 temperature range:0-50 c receiver specification ============================ 1 sensitivity : 3 micro volt at 52 db(a)rms sn 2 frequency response: 50hz-18khz 3 power supply: 10-24vdc 4 squelch: tone code plus amplitude 5 diversity: true antenna transmitter ================= 1 rf output power: >6mw 2 frequency range: 60 hz- 18khz 3 audio input: 3.5 mm jack socket 4 power supply: 2 aa size batteries 5 microphone type: dynamic 6 pick-up pattern: cardioid 7 adjustment range of transmitter sensitivity: 0 to - 30 db, adjustable in 10-db steps 8 antenna: internal 9 transducer principle: condenser, pre-polarized 10 display : channel, frequency, mute, battery level accessories ================== all the essential accessories required to complete the system shall be provided by the bidder. price inclusive of packing, transportation and delivery up to nalco refinery premises. category not available on gem for the text string uploaded by the buyer relevant lapel pin total quantity : 6