2023-04-06 Windward Exh B (Item#1 ASIAA PL-SPP-2022-000025)

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generation and come with different frequency. We will say that usually in lower frequency parts, but this part is the part that we are most interested in for specific science topic. Usually this is something that technicality we say that is below 5 gigahertz. So, usually our Wi-Fi is something like 2 to 3 gigahertz. Our cell phone now the LTE, which is below one gigahertz, something like 700 megahertz. Our communication, our walkie-talkie, this thing is something about a couple hundred megahertz. Our radio station FM which is about 100 megahertz. We will listen to this Hawaii PBS 93.3 megahertz. So, it happened to be this part of the frequency is what we are most interested in. Clearly because the signal we're interested in is so weak, extremely weak. It's all under this man-made signal. All this, our cell phone, our Wi-Fi, our walkie-talkie is all much lower than that, that frequency. So, if I want to do this experiment in Hilo, that's impossible because we have this so-called spectrum analyzer[indecipherable]we see the air is full of all these different man-made signals. We cannot see anything that's coming from the sky. So, that's why I've looked around the whole island very well, as many places I can assess to, that reasonable I can drive to and I'm going to use my device to check for how noisy of the environment and it turns out that I looked and looked, and it's happened to be in the south part of the Big Island is the most quiet. But you sort of can envision that because first of all it's flanked by Mauna Loa. So, all the signals from Kona side, from Hilo side that it can be blocked out by Mauna Loa. There's a strong cell phone tower from Volcano Village that's broadcast along the highway, that's for safety. Even that is too strong for our work. So, I had to try to hide away from that signal somehow. I cannot go too south because once past Pahala then that's South Point, that's Discovery part and then there's even a very strong radar right next to Pahala on the southwest side. That broadcast is extremely strong that will completely saturate everything that our sensitive device. So, this is how we define a safety quiet zone. If you go to Wood Valley, there's just no cell signal. Your cell phone doesn't work there. It's so nice, so quiet. So that's the best place but then we respected our neighbor. I do recognize that is not the right way for us to put our experiment, that's why we came out of Wood Valley. I did the test again, it's not as good but I think for our experiment so far, we can take it. We can do it there. So, that's why we think that's a good place to do it. Many because there's just no man-made signal. We are just listening. We're sitting there listening to some whisper from the sky, that's a natural whisper not intelligence. So, that's what we call the radio quiet zone. LIN: Thank you Dr. Chen. I appreciate the background. I guess why Hawaii Island. There's other islands in the Pacific, there is Alaska up north, there's all these different areas that could be a possible site. But why choose Big Island? CHEN: Well, that's because I'm here. I think mainly because this is the location that we've been doing astronomy here. I'm a scientist, I'm doing this for my career. As a scientist we don't really produce things, the physical thing, tangible things, but we do explore. We make knowledge, no, we explore knowledge, and we try to understand our past and understand what we are now. Because I believe that by knowing and gathering all this knowledge then we will know better to make decisions for the future. So, that's what I do. That's what actually my colleague do, we do it as a career. So, we always keep looking at a good site to do this. Yes, there might be a 12 EXHIBIT B