Orbit Research Ltd - Professional satellite communciation systems. Enhanced Automatic Frequency Control Orbit Research Ltd manufactures Enhanced Automatic Frequency Control Equipment for Inmarsat Land Earth Stations. The units provide an extremely precise control of the traffic frequency converter local oscillators to remove satellite frequency errors and Doppler shifts.
Demodulators have to work just at their operating thresholds with little margin for error.
A small change in the frequency of the transmitted or received signal in the wrong direction could spell disaster for communications traffic and lead to lost reputations in a highly competitive industry. At least 10 times more accurate than the required Aeronautical specification, the Orbit EAFC unit uses a unique system for ensuring perfect control of the traffic uplink and downlink carriers which will meet the new challenges of mini-m and satellite paging. Engineers at Orbit Research have worked closely with LES operators and Inmarsat to develop what we believe to be the best solution possible for frequency control now available. The Orbit EAFC measures and calculates satellite Doppler and provides an ultra low phase noise reference to the traffic up and down converters. Our system is very flexible in design and can be configured to operate with any third party frequency converter.