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The phrase "above a certain frequency" is correct and usable in written English.
It can be used in contexts related to sound, signals, or any measurable phenomena where a threshold frequency is relevant.
Example: "The device operates effectively only above a certain frequency, ensuring optimal performance."
Alternatives: "beyond a specific frequency" or "over a particular frequency".
Exact(12)
Above a certain frequency, (h_{s}) begins to decrease.
However, analysis by other authors has shown that the radiation deviates from omni-directional above a certain frequency.
Certain filters pass frequencies below a certain frequency while attenuating all frequencies above it, others pass all frequencies above a certain frequency while attenuating all frequencies below it.
Since these major assumptions tend to be met only above a certain frequency limit, the method is restricted to the high-frequency range.
The periodic underloads applied above a certain frequency decrease the fatigue threshold measured at crack growth rate of 2 × 10−7 mm/cycle.
These characteristics show that above a certain frequency (f ~ 104Hz), the effect of multilayer capacitor increases with the frequency, and as the result there is an increase in conductivity.
Similar(48)
In the above context, each node has σ forwarders, and before a node sends a data packet, it sends the preamble at a certain frequency (denoted as V) in the self-learning state.
A sign on the lawn instructs viewers to tune their car radios to a certain frequency.
Whether you think that that 4p off is all you deserve for giving the store the valuable information that someone buys a coffee in a certain store at a certain time of day at a certain frequency is another question.
Tune into a certain frequency of social media, and the above taken from the words of those who lived through it is viewed as suspect at best, at worst as fabrication.
There's just a certain frequency that you're able to tap into.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com