Radio Frequencies facts

While investigating facts about Radio Frequencies Near Me and Radio Frequencies Uk, I found out little known, but curios details like:

During a critical moment in the Apollo 13 mission the Soviet Union discontinued radio transmissions in the frequency bands used by Apollo to prevent radio interference

how to listen to police radio frequencies?

An Iranian F-4 Phantom tried to shoot down an U.S. surveillance drone in international airspace. An American F-22 Raptor flew under the F-4 undetected, checked out their weapons, pulled up on their left wing, switched to their radio frequency and said ‘you really ought to go home'”

What radio frequencies require a license?

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across answering what radio frequencies can i use. Here are 35 of the best facts about Radio Frequencies Nz and Radio Frequencies Chart I managed to collect.

what radio frequencies are harmful to humans?

The Thing - a listening device in a carving of the Great Seal of the United States. A gift from the USSR to the US, it hung in the embassy for 7 years. It contained no electronics and would activate when a radio signal of the correct frequency was transmitted to it.
People used to download games from the radio frequencies. Radio Belgrade broadcasted about 150 games
Since 2001 astronomers have detected 11 high frequency radio signals, which share an underlying mathematical pattern that defies explanation as naturally occuring phenomena.
The Wow! signal, a strong narrowband radio signal detected on Aug 15, 1977 that originated from near Chi Sagittarii. Its frequency is very close to the Hydrogen Line, which scientists believe intelligent races might use to send a strong signal. We still do not know its origin.
Since 2004, Yosemite Sam has been exclaiming "Varmint, I'm a-gonna b-b-b-bloooow yah t'smithereenies!" continuously on a range of shortwave radio frequencies. Reports indicate the transmission may come from Albuquerque.
If when Sputnik was launched in October 1957, if you turn on your radio to its frequency, you could hear it, and it sounded like this
In 2005 and 2006, the U.S Department of Defence issued espionage warnings after mysterious coins with radio frequency transmitters were planted on U.S. contractors with classified security clearances. It turned out that the coins were ordinary Canadian quarters.
Gen. Terry Allen broadcasted "What the hell are you guys waiting for? We have been ready ever since 4:00 P.M." over German radio frequencies in anticipation of an attack.
A radio wave is broadcast in different frequencies which can include FM radio waves that broadcast between 88 MHz and 108 MHz, and AM radio waves that broadcast between 550 kHz and 1600 kHz.
After her emigration to the US, she developed a system which manipulated radio frequencies at irregular intervals to encode classified military messages.

radio frequencies facts — What radio frequencies do not require a license?

Radio Frequencies data charts

For your convenience take a look at Radio Frequencies figures with stats and charts presented as graphic.

radio frequencies fact data chart about Distribution of call sign letters (excluding the first lette — Distribution of call sign letters (excluding the first letter) and frequencies in American FM radio stations

Why do radio djs talk over songs?

You can easily fact check why are radio djs so annoying by examining the linked well-known sources.

The Säkkijärven polkka, a Finnish folk song which the Finnish Army played continuously over 1,500 times on Soviet radio-controlled mine frequencies to jam them during the Continuation War

China built an antenna that emits extremely low frequency radio waves. It spans an area of almost 5 times the size of New York. - source

The National Radio Quiet Zone, where residents are restricted or prohibited from using cell phones, Wi-Fi devices, microwave ovens and gasoline-powered motor vehicles. This is to prevent radio frequency interference at scientific research and military intelligence facilities in the area. - source

The "pops and crackles" you hear in the static of an AM frequency radio, like the ones found in cars, is actually interference caused by lighting somewhere on the planet.

Li-Fi is 100 times faster than Wi-Fi and it has a frequency range of 10,000 times greater than radio waves - source

When did radio communications begin?

Smart homes uses the Z-Wave communication protocol, which communicates with one another on the 800-900MHz radio frequency range, and thus does not suffer from any major interference issues. It also link up together to form a mesh network, with up to 232 nodes available for use.

How do radio frequencies work?

Wi-fi uses radio waves that are routed through a wireless internet router using radio waves in frequencies between 2.4 and 5.8 GHz.

Radio frequency EMFs below set exposure limits for humans promote tumor growth. A previous study was replicated, with even more test animals this time, that confirmed the original results of tumor promotion under RF-EMF exposure. Phones don’t directly cause cancer, but rather accelerate it

At the height of the cold war, countries would use short wave radio frequencies to broadcast one-way encrypted messages to spies who would know where and when to tune in. These messages would feature a short synthesized voice of a woman repeating strange numbers or letters

Plants are able to transmit radio frequencies, and can be heard clearly

The radio frequency 1420 Mhz is internationally banned for use on Earth due to the probability of its use by intelligent extraterrestrial to communicate a message.

When are two way radio communications established?

Aviation still uses AM radio because of a phenomenon in FM radio known as the 'capture effect', in which only the closest signal will be properly heard. In AM, this effect is not a factor, allowing multiple transmitters to still be heard on one frequency.

In 2005, a group of MIT students tested the effectiveness of foil helmets at blocking various radio frequencies. The helmets surprisingly, amplified certain frequencies: those in the 2.6 Ghz (used in mobile communications and satellites) and 1.2 Ghz (used for radionavigation/satellites) bands.

Before the public internet, some folks harnessed something called 'Packet' which is "a digital data transmission mode on HF (high frequency) radio". Some folks still muck about with it - you can see it in action here.

TV Channel 37 is not used in most North American countries because that particular frequency is useful for radio astronomy.

A Q meter is a piece of equipment used in the testing of radio frequency circuits. It has been largely replaced in professional laboratories by other types of impedance measuring device, though it is still in use among radio amateurs.

How many radio frequencies are there?

FM radio reduces static by changing the frequency of the radio waves instead of changing amplitude (AM radio)

Pyramid of Giza is able to interact with external electromagnetic waves of the radio frequency range 200-600m (roughly the length of the pyramid base). Interactions include first multiple resonances and energy concentration.

A license is required to communicate on HAM/Amateur radio frequencies, even in 2015.

Many devices use 2.4Ghz because they only work with specific frequencies. The lower frequencies in the MHz range are off limits because radio and TV use them; the higher frequencies were expensive and bad at going through walls.

In 2007 the US Government's Defence Department warned that "mysterious coins with radio frequency transmitters" were found planted on US Contractors travelling in Canada. In reality, these were the colourized 'poppy quarters', quarters with a small red poppy on them to remember the fallen.

MIT researchers found out that tin foil hats amplify governmental radio frequency bands.

We have been receiving very short radio frequency bursts from space for over a decade

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