Yaesu FT-991 Operating Manual page 32

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Before turning on the main power, please verify the following items once more.
 Have you made all ground connections securely? See page 12 for details.
 Do you have your antenna(s) connected to the rear-panel Antenna jack(s)? See page 13 for details.
 Is your microphone (and/or key or paddle) connected? See pages 14, 15 for details.
 If using a linear amplifier, have all interconnections been successfully completed? See pages 16 for details.
 Please rotate the AF GAIN control to the fully counter-clockwise position, to avoid a loud blast of audio when the
transceiver turns on. See page 21 for details.
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