B-cell
发表于 2025-3-23 10:44:06
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压迫
发表于 2025-3-23 16:57:50
Radio and Radar Astronomy Projects for Beginners978-3-030-54906-0Series ISSN 1431-9756 Series E-ISSN 2197-6562
较早
发表于 2025-3-23 20:24:31
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AMPLE
发表于 2025-3-23 23:24:01
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极端的正确性
发表于 2025-3-24 03:44:31
A Brief History of Radio Astronomy across his laboratory. After doing this, Hertz noted in his journal, “I have successfully transmitted and received radio waves and have found them of no practical use.” If only he had realized what he had discovered: the unit of frequency that has since been named in his honor, Hertz (Hz).
Demonstrate
发表于 2025-3-24 09:52:29
Types of Antenna some respects can be likened to an optical telescopes lens or mirror, as the antenna collects the radio signals and brings them to a focus at the dipole of the antenna. This signal is then passed along the feed cable to a receiver and amplified.
Charitable
发表于 2025-3-24 10:51:26
The Stanford Solar Center’s SuperSID Monitordo not have much space, as the antenna needed for the SuperSID monitor doesn’t need to be placed high up. No antenna mast is needed, and the antenna will work perfectly well at ground level, either indoors or outdoors. In fact, the indoor antenna can work very well.
Nebulous
发表于 2025-3-24 15:18:19
The NASA Radio Jove Projectupplies a relatively cheap kit capable of receiving radio emissions from the planet Jupiter and the Sun. The kit is supplied in parts numbering a little over 100, and the user assembles the receiver, although a pre-built and pre-tested receiver can be purchased for an extra charge.
不吉祥的女人
发表于 2025-3-24 20:17:49
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小卷发
发表于 2025-3-25 02:05:54
The Audio SpectrumThe age-old question is: If a tree falls in the woods and there is no one around to hear it, does it make a sound?