The article details the replacement of an airplane's obsolete Narco 50A transponder and encoder with a new Stratus ESG transponder and a high-accuracy encoder.
A significant part of the upgrade involved the meticulous installation of a new external GPS antenna on the fuselage, requiring drilling, strengthening, sealing, and precise placement to avoid signal shadowing.
This upgrade integrated the Stratus 2S unit, allowing it to receive enhanced satellite information from the newly installed GPS antenna, thereby improving the aircraft's ADS-B capabilities.