Advances in Computational Sciences and Technology ISSN 0973-6107 Volume 10, Number 5 (2017) pp. 699-708 © Research India Publications http://www.ripublication.com Digital Intercommunication System in Advanced Light Helicopter (ALH) Dankan Gowda 1 , Mahaveer Penna 2 , Satyasrikanth Palle 3 , Sai Priya KA 4 and Chaithra KN 5 1,2,3 Assistant Professor, Department of Electronics &Communication Engineerin Sri Venkateshwara College of Engineering, India Abstract Analog Intercom System provides one-to-one communication, there was distortion and signal loss in analog system Also, there was no proper control over the volume and frequencies. Digital Intercommunication System is implemented. It provides secure and jam resistant voice/data communication from air to ground and air to air in Very High Frequency/Ultra High Frequency Bands (V/UHF). The main purpose of this system is to provide inter communication among the flight crew .It also has the facility to communication with ground crew through an external jack during maintenance operation whenever required. It is a central control for all communication equipment mounted on ALH .It interfaces with various radio channels, warning and other audio outputs. It facilitates to communicate among crew members of ALH as well as with air traffic control (ATC) and other helicopter. Keywords: Analog Intercom System, ALH,Air Traffic Control(ATC), Digital Intercommunication System, flight crew I. INTRODUCTION The main purpose of the system is to provide inter-communication among the flight crew. Intercommunication is provided through three station boxes one each for pilot, co-pilot and two passengers. It is a central control for all communication equipment mounted on ALH. It interfaces with various radio channels, warnings and other audio