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Guam channel test(The dtacq files from the experiment are found at The first test file has both channels of all four receivers (Figure 1). There is a 90* phase difference between channels 1,3,5,7 and 2,6, while the difference is only ~ 45* for 4,8. Both channels in the pairs 1/2 and 5/6 have about the same amplitude, meaning they are likely I/Q (or Q/I) for the same receiver. For 3/4 and 7/8, the second channel in each pair have a lower amplitude and only a 45* phase difference, but they are probably also channel pairs for the other two receivers. Amplitudes decrease in the following order: 5/6, 1/2, 7/8, and 3/4. The second test file (Figure 2) has only the Q channel of the four receivers, which are the odd channels. In order of amplitude from largest to smallest, the dtacq channel pairs are 5/6, 1/2, 7/8, and 3/4. electronic set-up http://www.satlab.hawaii.edu/lera/data/fourrxtest/IMG_7408.HEIC|Figure 6 |