What are the frequency ranges for HF, VHF, UHF and MF devices?

Question

with regard to military comms/radar systems

Answer 1

See the links.

Answer 2

Radio frequency

Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including radio waves.Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. Such frequencies and the belonging wavelength account for the following parts of the spectrum shown in the table below.

Radio frequency spectrum
Band name Abbr ITU band Frequency
Wavelength Example uses
< 3 Hz
> 100,000 km
Extremely low frequency ELF 1 3–30 Hz
100,000 km – 10,000 km Communication with submarines
Super low frequency SLF 2 30–300 Hz
10,000 km – 1000 km Communication with submarines
Ultra low frequency ULF 3 300–3000 Hz
1000 km – 100 km Communication within mines
Very low frequency VLF 4 3–30 kHz
100 km – 10 km Submarine communication, avalanche beacons, wireless heart rate monitors
Low frequency LF 5 30–300 kHz
10 km – 1 km Navigation, time signals, AM longwave broadcasting
Medium frequency MF 6 300–3000 kHz
1 km – 100 m AM (Medium-wave) broadcasts
High frequency HF 7 3–30 MHz
100 m – 10 m Shortwave broadcasts and amateur radio
Very high frequency VHF 8 30–300 MHz
10 m – 1 m FM and television broadcasts
Ultra high frequency UHF 9 300–3000 MHz
1 m – 100 mm television broadcasts, mobile phones, wireless LAN, ground-to-air and air-to-air communications, and Two-Way Radios such as FRS and GMRS Radios
Super high frequency SHF 10 3–30 GHz
100 mm – 10 mm microwave devices, wireless LAN, most modern Radars
Extremely high frequency EHF 11 30–300 GHz
10 mm – 1 mm Radio astronomy, high-speed microwave radio relay
Above 300 GHz
< 1 mm Night vision

Notes

Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque to higher frequencies of electromagnetic radiation, until the atmosphere becomes transparent again

Answer 3

Rule of threes from memory (it's been a long time)

up to 3 MHz is MF
up to 30 MHz is HF
up to 300 MHz is VHF
over 300 MHz is UHF

Answer 4

fizzzzzle kkkkkkkkrrrrrriiiiipzzzzzzzzz i cant even pick up local radio i would say about 2metres from transmitter to my radio literally as the crow flies( trans>>>>>>xx<>>>>>`
!me)