The SBX-4 is an extremely sensitive 300 kHz minimum shift keying (MSK) demodulator. It obtains differential GPS corrections broadcast by radio beacons adhering to standards such as International Telecommunications Union M.823 and various broadcast standards in the frequency range of 283.5 to 325.0 kHz.
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Source: “Resources & Support.” Hemisphere GNSS. N.p., n.d. Web. 04 June 2017.