How to Say "to jam" in Spanish
The Spanish word for “to jam” is “interferir” — B2 level.
English → SpanishB2
verbB2formal
blocking a signal or frequency

Examples
El muro de concreto interfiere con la señal de Wi-Fi.
The concrete wall interferes with the Wi-Fi signal.
Las frecuencias de radio pueden interferir entre sí.
Radio frequencies can interfere with each other.
Using 'Con' for Physics
When talking about physical things like signals or waves blocking each other, we use 'con' instead of 'en'.
Related Translations
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