Space physics, Eccentricity, Inverse problems - Daily Reports (seiðr). Writings about various topics in plasma physics, radio science, space physics, rockets, radars, aurora, remote sensing, geophysics, radio astronomy, inverse problems, and software defined radio.
Here's a picture of the new EISCAT heating digital beamformer receiver.
A lot of work has gone into implementing a digital beam former for the EISCAT HF heating facility. Here's a photo of the digital receivers, the receive protection relay switches and cables going out to the 12 antenna rows.