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About the Rear Panel
FT-891 Operating Manual
RTTY/DATA
This is the input/output jack to connect a terminal unit for RTTY and TNC for packet
communications.
Connect a terminal unit with the optional “CT-39A” Packet Interface Cable.
NOTE: For details, refer to the Advanced Manual
(
download from the Yaesu website
)
.
SQL
SHIFT
PTT
DATA OUT
GND DATA IN
USB Jack
Control the transceiver remotely from a computer using the CAT commands.
Transmission control, can also be done from the computer.
Connect the computer with a commercially available USB cable.
NOTE: To control the transceiver remotely from the computer, a USB driver is required.
For details on the USB driver, visit the Yaesu website.
REM/ALC
Connect the optional remote control keypad “FH-2”.
When a device such as a linear amplifier is connected, this is an external ALC current
input jack.
EXT ALC
TX REQ
GND
REMOTE
NC
GND
KEY Jack
Connect a telegraph key or electronic keyer paddle to use for CW mode operation.
KEY
KEY
NC GND
GND
When connecting a single straight key
When connecting an electronic keyer paddle
DOT DASH COMMON
DOT DASH
COMMON
This 3.5 mm, 3-contact jack accepts a CW key or keyer paddles
(
for the built-in
electronic keyer
)
, or the output from an external electronic keyer. Contact connections
are shown below. Keyup is 5 volts, and key down current is 1 mA. Use only the 3.5 mm
3 contact type plug. An incorrect size plug may damage the jack. If the Keyer plug is
inserted into and removed from the jack while the FT-891 is in operation, the FT-891
may be switched to the transmit mode.
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