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It mentions FRBs which are the new hot thing in radio astronomy. Can those be measured with hobbyist methods? How?

I think these are more dreams of future achievements than anything else; they also list phased arrays and interferometers but there is nothing like it on the webpage of the project.

The Open Source Radio Telescope project hasn't setup any phased array setups yet, but the Canadian Centre for Experimental Radio Astronomy uses GNU Radio for it's phased array receivers looking at pulsars. http://www.ccera.ca

New Mexico Tech set up a two-element array with a couple of rebuilt K-band satellite-television dishes.

I don't know what they used for the correlator.

The Array Operations Center for the EVLA (Very Large Array) and the VLBA (Very Long-Baseline Array) are on the New Mexico Tech campus; we had a lot of radio-interferometer people in town.

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