SCS PCS G Block Plans Face Interference Fears

SpaceX/T-Mobile plans for supplemental coverage from space (SCS) using the PCS G Block (see 2302080001) are facing multiple interference criticisms. SpaceX and T-Mobile claim deployments in the PCS G Block won't interfere with adjacent channel terrestrial mobile service but don't substantiate that, AT&T said Tuesday in docket 23-135, urging the FCC not to authorize the SCS deployment until non-interference is proven. Dish Network said SpaceX is trying "to prematurely shoehorn" a SCS service into rules not designed for that, raising interference risks for G Block and adjacent band services. It said SpaceX still hasn't addressed such fundamental questions as how SpaceX transmissions won't compound T-Mobile terrestrial transmissions, raising the potential that they overwhelm adjacent band filters, and what's the timeline for launch of SpaceX Starlinks with a new antenna. Omnispace said T-Mobile's arguments about interference overlook the fact SpaceX satellites use higher power and antenna gain than T-Mobile terrestrial base stations. It said approval must await the companies addressing interference risks from SpaceX's SCS G Block downlinks into existing S-band mobile satellite service operators' uplinks.