This is a variable depth low-frequency transmitter and a passive, towed reception array.
In one, the low-frequency signal is isolated with a low-pass filter and Fourier-transformed.
He built a low frequency radio antenna on wheels and discovered that the bulk of the noise on the phone lines was coming from the galaxy.
Until recently, submarines relied on long / low-frequency radio waves for communication.
The site focuses on the benefits of reallocating low-frequency wireless capacity from broadcasting to unlicensed applications, both here and around the world.
For a variety of reasons the designs for low-frequency radio antennae can be very straightforward.
Satellite navigation may be degraded for days, and low-frequency radio navigation can be out for hours.
This corresponds to a 2.2-fold difference in current amplitude in the low-frequency range.
Definition of low frequency in US English:
low frequency
noun
(in radio) 30–300 kilohertz.
（无线电频率中30-300千赫的）低频
Example sentencesExamples
In one, the low-frequency signal is isolated with a low-pass filter and Fourier-transformed.
He built a low frequency radio antenna on wheels and discovered that the bulk of the noise on the phone lines was coming from the galaxy.
Until recently, submarines relied on long / low-frequency radio waves for communication.
For a variety of reasons the designs for low-frequency radio antennae can be very straightforward.
Satellite navigation may be degraded for days, and low-frequency radio navigation can be out for hours.
This corresponds to a 2.2-fold difference in current amplitude in the low-frequency range.
The site focuses on the benefits of reallocating low-frequency wireless capacity from broadcasting to unlicensed applications, both here and around the world.
This is a variable depth low-frequency transmitter and a passive, towed reception array.