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

2. Tunnel Radio Relay/Repeater: 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 GROUND LEVEL TUNNEL

3. 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 GROUND LEVEL

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

5. Certification to Class 1, Division 1, Groups C and D Reduce number of internal AA batteries from six to five (9V to 7.5V Install current limiting resistor between batteries and regulator (limit to 70mA) Install 250 mA fuse between batteries and regulator Intrinsically Safe Certification Anticipated Modifications: GROUND LEVEL TUNNEL

6. 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 x23 (24/7/365) e-mail: leymans@c-at.comleymans@c-at.com Website: www.radiointeroperability.comwww.radiointeroperability.com CAGE Code: 0EEY2, TIN: 54-1215868 DOL Small Business SIC 3669