How does an intelligent race which can only perceives microwave develops written language?

Imagine a race of humanoid alien living somewhere in the universe evolves weird sensory organ which can only picks up frequency of light ranging from 800MHz up to 2.5GHz which is in the microwave spectrum. They can hear and talk but how would they read and write? The more primitive the tech the better.

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How does an intelligent race which can only perceives microwave develops written language?

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