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F
T-991 O
peraTing
M
anual
ON/OFF
Switch
Press and hold in this switch for one second to turn
the transceiver on. Similarly, press and hold in this
switch for one second to turn the transceiver off.
KEY
Jack
This 1/4-inch, 3-contact jack accepts a CW key or
keyer paddles (for the built-in electronic keyer), or
output from an external electronic keyer. Pinout is
shown
on page ##. Key
up voltage is +3.3 V DC,
and key down current is 4 mA. This jack may be
configured for keyer, “Bug”, “s
traight key”, or
computer keying interface operation via Menu item
“
011 F CW KEYER
” (see page ##).
n
ote
:
You cannot use a 2-contact plug in this jack (to do so
produces a constant “key down” condition).
PHONES
Jack
A 1/4-inch, 3-contact jack accepts either monaural or
stereo headphones with 2- or 3-contact plugs. When
a plug is inserted, the loudspeaker is disabled.
n
ote
:
When wearing headphones, we recommend that you
turn the AF Gain levels down to their lowest settings
before turning power on, to minimize the impact on
your hearing caused by audio “pops” during switch-
on.
MIC
Jack
This 8-pin jack accepts input from a microphone uti-
lizing a traditional YAESU HF transceiver pinout.
f
ronT
p
anel
C
onTrols
& s
wiTChes
4
3
2
1
5
7
8
9
6
Summary of Contents for FT-991
Page 2: ......
