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Why was the frequency channel used by the GLONASS shifted down after 2005?

(a) Political issue

(b) Less power requirements

(c) Avoid future MSS interference

(d) Reduce atmospheric interference

I have been asked this question during an interview.

I'm obligated to ask this question of Global Orbiting Navigational Satellite System in portion Satellite Radio Navigation  & Inertial Navigation of Avionics

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Correct answer is (c) Avoid future MSS interference

To explain I would say: The Frequency of the GLONASS channel was shifted down in 2005. This shift down in frequency is to avoid interference from future Mobile Satellite Services.

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