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Video from Space, Balloons, TRBO and Frequencies for Essex

机译：来自太空，气球，TRBO和频率的视频，用于埃塞克斯

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Bill Robertson brings you a mixed bag this month - everything from video and data signals from space to hot air balloon, microlight and hang glider frequencies, the National Emergency Channel, TRBO, a simpler Bearcat manual and lots of Essex frequencies.rnLast month I gave you an insight into the range of line of sight radio siganls and how buildings and the like can reduce this range.rnHowever, if there are no obstructions in the way and the path is truly line of sight, for example, from the portable scanner in your hand to an aircraft flying at an altitude of, say, 33,000ft, you will be able to receive VHF transmissions from the aircraft at a distance of up torn200 miles away. On the other hand, you won't be able to hear the ground-based transmissions from the control tower communicating with the aircraft unless you are within 15-20 miles of it. This is why you'll often hear high-level aircraft in communication with ground-based control towers some distance away from you but not the transmissions from the controllers in the towers back to the aircraft.
机译：比尔·罗伯逊（Bill Robertson）这个月给您带来了很多麻烦-从太空到热气球的视频和数据信号，微光和悬挂式滑翔机频率，国家紧急通道，TRBO，更简单的Bearcat手册以及许多埃塞克斯频率。您可以了解视线无线电信号的范围以及建筑物等如何减小此范围。rn但是，如果路上没有障碍物，并且路径是真正的视线，例如来自便携式扫描仪的将您的手放在飞行高度为33,000英尺的飞机上，您将能够在距飞机200英里远的地方接收来自飞机的VHF传输。另一方面，除非您在距离飞机15-20英里的范围内，否则您将无法听到来自指挥塔与飞机通信的地面传输信息。这就是为什么您经常会听到高空飞机与距您有些距离的地面控制塔进行通信，但听不到塔中控制器向飞机传输的信息。

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