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Press F1 again to display the Level and C/N value.
Press F2 to display the spectrum information
1)
Press <Red(0/22K) button to turn on / turn off the 22KHz control .
2)
Press<Green (13/18V)> button to shift between 13/18V.
3)
Press<Left/Right>button to move Frequency
4)
Press <Yellow(Spectrum)> button to display following picture: