Improvement to High Frequency Communication System in Sri Lanka Navy for Better Performances

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IMPROVEMENTS TO HIGH FREQUENCY COMMUNICATION SYSTEM IN SRI LANKA NAVY FOR BETTER PERFORMANCES

INTRODUCTION
1. The High Frequency (HF) radio band is defined as the range of frequencies in the radio spectrum between 3 and 30 megahertz . Military organizations have used HF radios for both strategic and tactical communications for more than 80 years. However with the development of satellite communications (SatCom) use of HF communication were de-emphasized and fell in to disuse. In contrast to this importance of HF communication still existing for military applications. The militaries around the world must have a robust long range communication system that does not rely on existing communication infrastructure in emergencies, since the satellite comms and other comms infrastructure will present most lucrative targets for the enemy.
2. At present Sri Lanka Navy (SLN) use VHF and UHF line of sigh (LOS) systems for its tactical communications ranges up to 50Nm from transmitting (TX) stations, beyond this range SLN is compelled to use satCom systems to contact its fleet at sea. However this method is very expensive and voice call charges of satellite comm are beyond 500.00 Rs per minute, besides all the ships and craft of SLN fleet were not equipped with SatCom facilities. Furthermore the Inmarsat system which SLN use to connect with her fleet is a commercial system which controlled by a company this fact also raises security concerns.
3. SLN use two methods to meet this

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