|
principles projects CNMI-Guam old projects |
KnowHow /
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.  Figure 1. Odd dtacq channels (blue) and even dtacq channels (red) for channel pairs 1/2 (solid), 3/4 (dashed), 5/6 (dot-dashed), and 7/8 (dotted). 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.  Figure 2. Same as Figure 1 but with I=0; this means that Q are the odd channels and I are the even channels. electronic set-up  Figure 3  Figure 4  Figure 5 http://www.satlab.hawaii.edu/lera/data/fourrxtest/IMG_7408.HEIC|Figure 6 |
