> For the complete documentation index, see [llms.txt](https://bob-mayo.gitbook.io/high-temperature-electronics/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bob-mayo.gitbook.io/high-temperature-electronics/telemetry.md).

# Telemetry

Mostly we need to communicate to the surface, but there are other cases. There may be a need for local (1 meter?) communication between drill string components. If there is a hot area as well as a cold area inside of a flask/Dewar, there may be a need for communication between them, perhaps in the 1cm to 2cm range.

Wireless communication

Mud communication

Wireline communication