It is however conceived to work at a single frequency and requires a water cooling system.

Also as before, the stated achievement is for one single frequency in the visible spectrum.

The problem was that lightning is not tuned to a single frequency.

Those two bands are extremely narrow, each only a single frequency.

Most systems do not operate at just a single frequency.

Gee signals from a given chain were all sent on a single frequency.

The standard battery will last about two days (single frequency receive) if not scanning.

The single frequency of Drake's first system grew to 8.4 million.

Glad to see that a single frequency was picked for ac.

A pure tone is a sharp spike at a single frequency.