Broadcasters must protect their C-band satellite downlink sites from future interference and push back against plans that would completely rearrange the way the FCC allows C-band satellite channels to be received.

The cellular industry wants the FCC to reallocate C-band frequencies, which could take 100 MHz or more away from what is currently available for every C-band dish owner to use. The proposed frequency rearrangement could require every dish owner to replace every single C-band LNB, the amplifiers at the front of every dish. It could also require dish owners to purchase new TI (terrestrial interference) blocking filters to mate with every C-band LNB.

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From tvtechnology.com