The phrase "a clear frequency" is correct and usable in written English.
It can be used when discussing a specific frequency that is easily identifiable or distinguishable, often in contexts related to sound, signals, or data analysis.
Example: "The audio engineer adjusted the settings until they achieved a clear frequency that enhanced the overall sound quality."
Alternatives: "a distinct frequency" or "an identifiable frequency".
During one trip, while just across the river from downtown Detroit, I struggled to find a clear frequency.
After applying our proposed filter in the axial measurement of the parametric loudspeaker, a clear frequency dependence from parametric array effect is detected, which exhibits a good match with the well-known theory described by the Gaussian-beam expansion technique.
I kept thinking things would right themselves, but our marriage had become like a radio that played only static; we couldn't find a clear frequency no matter how much we fiddled with the dial.
In contrast, the candidate methods provide a clear frequency and power estimation and make the interference disappear because of their feature-based nature.
During this period, the upper and lower band chorus waves were simultaneously observed with a clear frequency gap at fc/2.
In general, the frequency of the oscillations was higher in the first than in the second HFO burst and in between the early and late bursts there was a clear frequency and amplitude decrease, which allowed the two bursts to be separated.
On the basis of our present results (up to 30 kHz), we find in the dispersion temperature region of glycerol a clear frequency-dependence of the real part and a non-zero, frequency-dependent imaginary part of the thermal effusivity, which is consistent with literature data.
Indeed, a clear frequency-dependent decrease of the ${\chi {{\prime\prime \hfill \atop {\rm ac}\hfill}}}$ maxima is observed.
If there's too many terrestrial radio stations you might have a hard time finding a free and clear frequency.
These have also been argued to have arrived into Europe during the early Neolithic from the Near East2,59,60,61, and display a clear northward frequency cline23,62.
Velocity fluctuations with a clear dominating frequency are found immediately outside the wake along all the models, even if their magnitude decreases at a height corresponding to the free end of the bodies.
