Not much, but the design of these things is incredible. I spent 20 years managing the operations for the ground processing of this data in North America. We w

Not much, but the design of these things is incredible. I spent 20 years managing the operations for the ground processing of this data in North America. We worked closely with the transmitter manufacturers to certify them for use with the system (https://www.argos-system.org https://www.argos-system.org). Microwave Telemetry builds the smallest ones: https://www.microwavetelemetry.com/solar_ptts https://www.microwavetelemetry.com/solar_ptts The design and manufacture of these devices is incredible. The guy behind the company is an incredible engineer (and a nice guy)!