We’ve all used walkie-talkies at one point or another, or seen a cop do it on some movie. Short-hand radio has been around forever, but creating your own radio to listen in can cost hundreds of dollars and require special radio licenses, depending on what you buy. But we’ve got a...
A. Two B. Eight. C. Six. D. 听下面5段对话或独白。每段对话或独白后几个小题,从题中所给的A,B,C,三个选项中选出最佳选项,并标在试卷的相应位置。听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 相关知识点: 试题...
Scanners are radio receivers that have extremely wide frequency ranges so you can listen to all kinds of radio signals. Typically, scanners are used to tune in to police, fire and emergency radio in the local area (so scanners are often called "police scanners"), but you can use a scanner...
During the Cold War from the 1950s to the 1980s, shortwave radio enthusiasts across the world began noticing weird broadcasts that would often start with music or the sound of beeps, which would be followed by even more strangeness -- the voice of a woman counting in German, for example,...
TheFriends of Radio NRW– an independent group of shortwave listeners and radio amateurs in Germany – have been organizing 2-3 SWL camps per year for a number of years, where they meet as far away as possible from electrical noise in order to listen to shortwave together. ...
When you listen to an AM radio broadcast, your radio is tuning in to a sine wave with a frequency of around 1,000,000 cycles per second (cycles per second is also known as hertz). For example, 680 on the AM dial is 680,000 cycles per second. FM radio signals are operating in ...
April 6, 2020 at 8:28 am I am new to all this and just bought a Tecsun PL-880 Shortwave radio receiver to listen to SW, MW, etc. Would this be a good antenna for receiving shortwave? Thank you. VinceApril 6, 2020 at 12:28 pm...
How to Troubleshoot Most Often Ham Radio Problems?: eAskme In some ways, it does, but there is still a requirement for radio as a communication medium. For example, shortwave radio transmissions are the staple of the airline industry, and this is also true in the maritime world. ...
NARRATOR:Listen to part of a lecture in an astronomy class. The professor is discussing auroras. MALE PROFESSOR:OK. The aurora. The aurora refers to the rays of bright colors in the night sky near the North and South Poles—in the Northern Hemisphere it’s called the aurora borealis and ...
Monitoring the Feds: How to Use Your Scanner or Shortwave Radio to Eavesdrop on the Federal GovernmentThis morning, April 26, 2009, the federal government declared a public health emergency, as the number of ... If you live in an apartment building and have a scanner...