1420 mhz造句

• They operate at the 1420 MHz frequency corresponding to an absorption line in atomic hydrogen.
• It lies between the spectral lines of hydrogen ( 1420 MHz ) and the hydroxyl radical ( 1662 MHz ).
• Each time the signal was detected, it was again at about 1420 MHz, the original frequency before any drift.
• It has a 3-meter parabolic antenna that can be directed in azimuth and elevation, an LNA that covers the 1420 MHz spectrum, a receiver to reproduce the wideband audio, and a standard personal computer as the control device and for deploying the detection algorithms.
• In the course of this solar work, Wild became interested in the Purcell in the US first observed the 1420 MHz transition in 1951, he went back to his report, generalised it to include the interstellar medium, and six months later published the first detailed theoretical paper on the hydrogen lines  a classic in the field.
• I'm a little confused by this New Scientist article, which states that the 8-37 Hz / s drift of this radio source corresponds to a speed much greater than that of Earth's rotation . 8-37 Hz / s of drift in a 1420 MHz signal should correspond to a speed of ( 8 / 1420 * 10 ^ 6 ) * 300 000 000 = 1.69 m / s, correct?