supply of vhf systemvhf system, vhf system ( duplex ) of 25w with interface of telephone consisting of following modules. ( each set ) ( 1 ) vhf digital repeater having following specification with 6db antenna , rg 213 co-axial cable of length 30 mtr and 12v 65ah battery in cabinet ( 02 nos each ) : ( a ) frequency range: 136-174 mhz ( b ) channel spacing: 12.5 khz ( c ) tx power: 100% duty cycle on 25 watt ( d ) operating voltage: 13.6v dc + / - 15% ( e ) transmitter : ( i ) rf power output: 50-5w ( ii ) spurious emission: 80db ( iii ) modulation distortion: less than 1% at 1000 hz ( f ) receiver: ( i ) sensitivity ( digital ) 3% ber:0.28 micro volt ( ii ) intermodulation: 80db ( iii ) audio distortion ( ext. speaker ) : less than 2.5% at 1000hz ( iv ) audio output ( ext. speaker ) : 4w ( at 4ohms, less than 5% distortion ) ( 2 ) duplex phone patch controller having following specification ( 02 nos ) : ( a ) input voltage: 10.5 v to 13.6v dc ( b ) telephone line connector: modular plug ( c ) telephone line: 2w line ( d ) audio frequency response: 300-3000 hz from 1khz reference ( e ) audio distortion: 3% maximum ( 3 ) telescopic antenna mast expandable upto 20 feet height with tripod stand ( 02 nos. ) . ( 4 ) service charges for getting permission from wpc. ( 5 ) royalty and license fee for one year. the tenderer shall invariably mention make and model in his / her offer otherwise the offer shall be summarily rejected. sr. section engineer gujarat 2.00 set