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About the Rear Panel
FT-891 Operating Manual
EXT SPKR
This is the monaural jack to connect an external speaker (4 Ω to 8 Ω).
Connecting an external speaker to this jack will deactivate the internal speaker.
SIGNAL GND
ANT
Jack
This is the M-type coaxial connector to connect HF band and 50 MHz band antennas
(50 ohms).
DC IN
Jack
This is the DC power supply connection for the transceiver. Use the supplied DC cable
to connect directly to a DC power supply, which must be capable of supplying at least
23 A @13.8 VDC.