Novachrono07idn
Answered

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1. What bands are suitable for communication over great distances?​

Sagot :

Vistadmitriuseidn

Answer:

High frequency (HF)

Explanation:

is the ITU designation[1] for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio.

Riseymaeidn

Answer:

Low frequency (LF) is the ITU designation for radio frequencies (RF) in the range of 30–300 kHz. Since its wavelengths range from 10–1 km, respectively, it is also known as the kilometre band or kilometre wave. LF radio waves exhibit low signal attenuation, making them suitable for long-distance communications.

Explanation:

HF and lower frequency radiation(F2)

The F2 layer is the most useful for long-range communications when satellites or long cables cannot be used.

Most of the long distance communication results from ionisation of the F layer, the most applicable radio bands in the High Frequency being 3.5 MHz, 7 MHz, 14 MHz and 21 MHz.

ummm hope it help ^_^

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