耐寒
发表于 2025-3-25 03:25:47
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Delirium
发表于 2025-3-25 08:52:25
Electrical Components If in any doubt about mains/grid power supply, consult a qualified electrician.
organic-matrix
发表于 2025-3-25 11:51:45
Cables and ConnectionsThe job of the feed cable is to carry the signal from the antenna to the receiver. The feed cable is made up of an inner conductor, which can be a single solid wire or a multi-stranded one. Surrounding the inner core there is the inner dielectric insulator, then a woven copper shield and finally an outer plastic covering.
温顺
发表于 2025-3-25 17:35:03
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Notify
发表于 2025-3-25 22:38:40
ModulationWhile engaging in the projects within this book, we will encounter two types of radio signals. The first is an artificial radio signal, and the second is a natural radio signal. The trick is knowing which is which. We also need to know if these radio signals are modulated or not.
大吃大喝
发表于 2025-3-26 00:16:27
The Software-Defined Radio (SDR)Regardless of its modulation, a radio signal can be looked upon as an alternating current (AC), granted a very small one. This alternating current is therefore an analogue signal.
别炫耀
发表于 2025-3-26 08:06:26
SDR SoftwareThere are several different versions of SDR software, available either as license-paid or freeware. The best thing to do is try the freeware, and if a more advanced version is required, look at some of the paid versions. The two that will be discussed here are both freeware.
左右连贯
发表于 2025-3-26 08:56:16
Picking Up the International Space StationThe international Space Station (ISS) to date is the most expensive single item ever built.
一致性
发表于 2025-3-26 13:06:43
Steven ArnoldA nontechnical, nonmathematical primer on amateur radio astronomy.Includes 4 new amateur projects, including bouncing a signal off the Moon, detecting the aurora and ISS, and more.Offers expanded reso
Minikin
发表于 2025-3-26 18:35:51
Book 2021Latest edition aboard the ISS. Requiring no previous knowledge, no scary mathematics, and no expensive equipment, the book will serve as a fun and digestible reference for any level of astronomers hoping to expand their skills into the radio spectrum..