Aviation Interests Urge Guard Band for 137-138 GHz Use by Satellites
Satellite use of 137-138 MHz poses a harmful interference risk to very high frequency data link mode 2 (VDLM2) operations at 136.975 MHz and should be insulated by a guard band of at least 25 kHz at the bottom of…
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the 137-138 MHz band, aviation interests told FCC International and Wireless Bureau staffers, according to a docket 18-86 posting Friday. They said lack of ITU Radiocommunication Sector recommendations for space operation out-of-band emissions below 1 GHz caused uncertainty, particularly because different administrations have different views on protecting aviation. VDLM2 is an aviation downlink technology for sending and receiving air traffic control and airline operational control communications messages, they said. The aviation interests were Aviation Spectrum Resources, Collins Aerospace, Sitaonair and Harris Corp.