Furuno FS-5070 - Manual (Page 31)

2. SSB RADIOTELEPHONE
2-7
2.5 When Automatic Tuning Fails
The antenna coupler automatically tunes a wire or whip antenna transceiver. When all
frequencies cannot be tuned, TUNE: OK will not appear on the display. In this case, you can
tune 2182 kHz by manually operating the coupler as shown below.
DANGER
HIGH TENSION HAZARD
DO NOT TRANSMIT WHEN
THE ANTENNA COUPLER
IS OPEN.
1. Turn off the control unit. Remove the cover of the antenna coupler.
2. Set the MANUAL-AUTO switch to the MANUAL position.
COUPLER BOARD
MANUAL AUTO
3. Replace the cover.
4. Turn on the control unit.
5. Communicate using 2182 kHz.