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What (who) is 4-millimeter band - definition

4-millimeter band

The 4-millimeter band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The band is between 75.

https://en.wikipedia.org/wiki/4-millimeter_band

1-millimeter band

PORTION OF THE EHF (MICROWAVE) RADIO SPECTRUM

1 millimeter (RF band); 1 millimeter band

The 1-millimeter band is a portion of the EHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The band is between 241 GHz and 250 GHz.

https://en.wikipedia.org/wiki/1-millimeter_band

Millimeter cloud radar

$Sketch of a Doppler spectrum. The spectral power <math display="inline">S(v_{d})</math> is represented as a function of the Doppler velocity <math display="inline">v_{d}</math>. The parameters <math display="inline">v_{min}</math> and <math display="inline">v_{max}</math> denote the minimum and the maximum velocities, at which <math display="inline">S(v_{d}) > 0</math>, and <math display="inline">dv</math> is the velocity resolution.$

WEATHER RADAR TUNED TO CLOUD DETECTION

Millimeter Cloud Radar; Millimeter wave cloud radar; Millimetre cloud radar

Millimeter-wave cloud radars, also denominated cloud radars, are radar systems designed to monitor clouds with operating frequencies between 24 and 110 GHz (Table 1). Accordingly, their wavelengths range from 1 mm to 1.

https://en.wikipedia.org/wiki/Millimeter_cloud_radar