There are dozens if not hundreds of different digital modes used for communication on the MF and HF bands. These aren’t broadcasts you want to listen to unless you like to hear weird tones, beeps, warbles, and grinding noises interspersed with static. Digital modes are for monitoring, not ...
The first radio broadcasts occurred in 1906 or so, and frequency allocation for AM radio occurred during the 1920s. (The predecessor to the FCC was established by Congress in 1927.) In the 1920s, radio and electronic capabilities were fairly limited, hence the relatively low frequencies for ...
As Mike notes, “It’s a bit more to fiddle with than just a spike. But in the frozen north you have to deal with ground conditions. Get yourself a cheap tripod and give it a try. Will also work well when the park will not let you stick anything in the ground or use a tree.”...
Radio waves control everything from AM/FM broadcasts to wireless networks to garage door openers. William Taufic/Getty Images Electromagnetic radio waves are one of the most significant discoveries for 20th and 21st century technology. You don't see them, but countless high frequency waves are ...
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,...
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...
aIt was easy for the average person to tune to his favorite local radio station for the latest news of war developments, but it was far more interesting, and challenging, to try and tune in to foreign broadcast stations on shortwave that had English language newscasts. 一般的人调整对他喜爱的...
Broadcast satellites broadcast television signals from one point to another (similar to communications satellites). Scientific satellites, like the Hubble Space Telescope, perform all sorts of scientific missions. They look at everything from sunspots to gamma rays. Navigational satellites help ships and...
aIt was easy for the average person to tune to his favorite local radio station for the latest news of war developments, but it was far more interesting, and challenging, to try and tune in to foreign broadcast stations on shortwave that had English language newscasts. 一般的人调整对他喜爱的...
Because shortwave broadcasts are so easy to tune into, anyone with a cheap radio can eavesdrop by finding the right frequencies. That includes you. Many frequencies are listed at various web sites likeSpyNumbers. What you'll hear varies by station. Some stations broadcast continually. Others spr...