5.149 When assigning frequencies to other services already allocated to the following bands: Urge relevant authorities to adopt all practicable measures to protect radio astronomy from harmful interference. Transmissions from space-based or airborne radio telescopes can be a particularly severe source of interference for radio astronomy (see sections 4.5 and 4.6, and paragraph 10).
Article 29).（WRC-07）
In fact, a city (other than Zhejiang and Shanghai) can use the 23 cm band, and 5.149 GHz does not require 1296.
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