What is range of very low frequency?

Very low frequency

Frequency range	3–30 kHz
Wavelength range	100-10 km

What radio frequency could they have used in order for the radio signal to reach other ships as they call for help?

Marine radio – medium-range transceivers on ships, used for ship-to-ship, ship-to-air, and ship-to-shore communication with harbormasters They use FM channels between 156 and 174 MHz in the VHF band with up to 25 watts power, giving them a range of about 60 miles (97 km).

What is low frequency radio?

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.

Which of the following have the lowest and longest frequency?

Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.

What frequency do ham radio stations use?

Canadian standard time and frequency station CHU can be heard on 3330 kHz. Several fixed stations also use this range, including several associated with various agencies of the U.S. government. Best reception will be at night. This range is used for civil aeronautical communications in USB. This is the 80-meter ham radio band.

What frequency is 3330 kHz?

This is the 90-meter broadcasting band, used mainly by stations in the tropics. Canadian standard time and frequency station CHU can be heard on 3330 kHz. Several fixed stations also use this range, including several associated with various agencies of the U.S. government.

What is the 4125 kHz band used for?

This is a fixed station band, mainly used by military forces for SSB traffic. This is a band used for maritime communications in USB, with 4125 kHz being used as a calling frequency. This range is mainly used for fixed and mobile stations in USB. This range is used for aeronautical communications in USB.

What equipment is available for the 137 kHz band?

A lot of equipment for the band is homebrew, but commercial equipment is becoming more available. Several HF/VHF transceivers have general coverage receivers which tune down to 100 kHz or lower, Recent QST Product Reviews now include sensitivity performance at 137 kHz. An introduction to an experimental band below the AM Broadcast band.