Which audio signals travel farther around?
Date created: Fri, Jun 4, 2021 9:55 PM
Date created: Sat, Jun 5, 2021 9:20 PM
Radio waves in the HF (3–30 MHz) range can travel around the Earth by bouncing off the ionosphere and allow one to communicate directly over 1000s of miles. Radio waves in Continue Reading
Date created: Sun, Jun 6, 2021 12:29 PM
The channeling of sound waves allows sound to travel thousands of miles without the signal losing considerable energy. In fact, hydrophones, or underwater microphones, if placed at the proper depth, can pick up whale songs and manmade noises from many kilometers away.
Date created: Sun, Jun 6, 2021 7:39 PM
If you are using the radio primarily outdoors with clear line-of-sight, then VHF is a better choice because it's signal will travel farther. If you are using the radio in or around buildings, in urban areas, or heavily wooded areas, then UHF is a better choice because it's signal will navigate around obstacles better.
Date created: Mon, Jun 7, 2021 7:56 PM
The expanding sphere of radio signals traveling outward from the earth is often portrayed in TV shows and Hollywood movies to be like a time machine. The further you get from earth, the further back you go in the history of radio and TV broadcasts.
Date created: Tue, Jun 8, 2021 9:32 AM
Here is a graph of the attenuation of sound at difference frequencies (accounting for atmospheric pressure and humidity): As you can see, low frequencies are not absorbed as well. This means low frequencies will travel farther. That graph comes from this extremely detailed article on outdoor sound propagation.
Date created: Tue, Jun 8, 2021 9:30 PM
A discussion on the Wikipedia page about AM radio notes: "Medium wave and short wave radio signals act differently during daytime and nighttime. During the day, AM signals travel by groundwave,...
Date created: Wed, Jun 9, 2021 6:30 AM
Not all radio waves travel farther at night than during the day, but some, short and medium wave, which AM radio signals fall under, definitely can given the right conditions.
Date created: Wed, Jun 9, 2021 7:17 PM
So, the farther away from the FM or TV station you are, the higher you have to have an antenna to receive the FM or TV signal. Note that the earth is round — we hope this doesn't come as a shock to anyone — and, therefore, these signals will literally leave the earth after 75 miles or so.
Date created: Thu, Jun 10, 2021 9:06 PM
Sound waves (actually, any kind of waves) can diffract around obstacles smaller than their wavelength, roughly speaking. Does AM or FM travel further? FM radio waves also travel horizontally and skyward.
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