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AO-40 frequency jumps

Despite a very large signal strength (distance less than 10 000 km, squint
better than 30°), The S2 beacon was quite difficult to decode at AOS in
Europe yesterday night.
Doppler variation was large, and the Fo carrier was shifting regularly (up
to 40 Hz sudden jumps).
Is the phenomenon coming from the magnetotorquers current surges ?

Jean-Louis F6AGR
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