If an alien located on a planet 100 light years from here was to switch on a big, multi-frequency radio receiver, and record all the noises coming from outer space for the next hundred years, on all frequencies, how many soap operas, advertisements and new broadcasts would they pick up from Earth? Would a mass-market radio, similar to our Earthly equivalents, pick up anything? Over time, as the number of Earth transmissions increases exponentially, would the alien pick up a cacophony or a damp fizzle? [more inside]
posted by 0bvious on Feb 23, 2012 - 10 answers

Are there wireless radios and microphones appropriate for bicyclists to communicate with each other?? [more inside]
posted by werkzeuger on Aug 27, 2011 - 6 answers

How did pilots communicate with each other in World War 1? [more inside]
posted by adamdschneider on Jun 22, 2009 - 4 answers

In the aftermath of major natural disasters like, for example, an earthquake, hurricane or tornado, there exist certain conventions and procedures for communication - like, for example, channel 19 on a CB radio, or the emergency broadcast network on TV. When speaking in terms of RADIO-based communication, what are the protocols and technologies that are in place now that are most likely to be used in a crisis such as this? CB? AM/FM? [more inside]
posted by kbanas on Feb 12, 2008 - 14 answers

I want recordings of people communicating over the radio, especially in a military or astronautical context. Gimme. [more inside]
posted by Drexen on Feb 1, 2008 - 5 answers

Electronics filter: Need to build something that'll light up different LEDs via radio frequency. Must be compact and battery powered. My electronics-fu is pretty good, but I'm not sure it's this good... [mi] [more inside]
posted by SpecialK on Aug 9, 2004 - 16 answers