The EyeStar-S4 Radio is not just a transmitter, but an End-to-End system for downlinking health and safety data, low-bandwidth scientific data (600 Kbytes/day) and an uplinking option, or a variety of other mission-critical information with its 24/7 anytime, anywhere connection to the Iridium network. The EyeStar-S4 has a 100% on-orbit success rate, and is flight-proven and flight-ready with a Technology Readiness Level of TRL-9, and is compliant with FCC requirements.
See below, an example of EyeStar Simplex energetic particle data from several orbits of GEARRS2. Small gaps in track show duty cycle of transmitter and long gaps due to sun sync of 78 packets of data sequence to save system power. Note the South Atlantic Magnetic Anomaly (SAMA) and the Aurora Oval. GEARRS simplex coverage maps (Ref. 4,5) are very uniform over the entire earth with a weaker coverage area in the Pacific Ocean. The 53 deg. latitude cutoff is due to the GEARRS2 Sat inclination and not due to the Globalstar link.
Eyestar S4 Product Sheet PDF v4.1
Blackbox Eyestar Product Line Summary