John Makous’s LightWork Memo 31 covers both the theory and experimental results of additive interferometry.
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Basic theory of additive interferometry - The theory section of LightWork Memo 31 explains how signals from two horns combine to produce interference fringes.
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Additive interferometry: experimental setup and results - The experimental section of the same memo describes a two-horn observation of the sun and how to interpret the results.
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Setting up a 2-horn interferometer - Equipment, wiring, alignment, and GNU Radio instructions for adding and multiplying interferometers.