ICRI Tunnel RadioRepeater Solutions Mine Safety Operation June

ICRI Tunnel Radio/Repeater Solutions Mine Safety Operation June 17 th 2010 ® MADE IN THE U. S. A

Tunnel Radio Relay/Repeater: ← TUNNEL → GROUND LEVEL Tunnel radio relay/repeater: Utilize MSHA approved radio inside tunnel 500’ cable/reel (18 lbs); “gang” up to 5000’ No AC/DC on cables Relay/repeater (4. 1 lbs) water-proof, powered by 6 internal “AA” batteries

Tunnel Radio/Relay Repeater GROUND LEVELTUNNEL ←→ Utilize MSHA approved radio inside tunnel 500’ cable/reel (18 lbs); “gang” up to 5000’ No AC/DC on cables Relay/repeater (4. 1 lbs) water-proof, powered by 6 internal “AA” batteries

Repeater/Relay Functional Diagram Entry team 2 -way radios frequency “A” transmitting to one another and to radio on reel 2 -way radio on reel receiving frequency “A 2 -way radios receiving frequency “B” or trunking assigned channel 2 -way radio connected to repeater/relay transmitting frequency “B” or trunking assigned channel to radios at ground level ORANGE: RF* GREEN: AUDIO LEVEL and BUFFER* BLUE: ‘KEYING’ LOGIC/CONTROL* VIOLET: SQUELCH TAIL BLOCKING* * adjustable Automatic gain control VOX with tail timer Audio buffer/delay Muting

Intrinsically Safe Certification Anticipated Modifications: ← TUNNEL → GROUND LEVEL Certification to Class 1, Division 1, Groups C and D Reduce number of internal “AA” batteries from six to five (9 V to 7. 5 V Install current limiting resistor between batteries and regulator (limit to 70 m. A) Install 250 m. A fuse between batteries and regulator

For Additional Information… G. Seth Leyman Communications-Applied Technology 11250 -14 Roger Bacon Drive, Reston, VA, 20190 Voice: 703 -481 -0068; Fax: 703 -471 -4428 Tech Support x 23 (24/7/365) e-mail: leymans@c-at. com Website: www. radiointeroperability. com CAGE Code: 0 EEY 2, TIN: 54 -1215868 DOL Small Business SIC 3669