Since then, they have been improved repeatedly over the past half-century, and form the basis for standards-compliant time and frequency measurements.

For high frequency measurements, the noise source will be embedded in a transmission line.

These instruments combine constant resolution and high precision of frequency measurement with great photometric accuracy.

High frequency measurements are stored on the buoys and retrieved during maintenance operations.

The frequency measurements obtained from the FDR are accurate to within 0.0005 Hz.

The frequency comb now serves as the basis for optical frequency measurements in large numbers of laboratories worldwide.

The development of the technique of transition-difference generated frequencies in spectroscopic wavelength and frequency measurements.

Pendulum Instruments is a line of scientific instruments for high-resolution time and frequency measurements.

Noise detection evolves by including frequency measurements which we experience as tones.

The last three topics deal with radio propagation, aerials, and frequency measurement.