Space physics, Experiments, 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, outdoors activities, electronics, 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.