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F
T-991
OperaTing Manual
installation anD interconnections
key, keyer, And coMputer-driven keying interconnectionS
The
FT-991
includes many features for the CW operator. These functions will be detailed in the “Operation” section
later. Besides the built-in Electronic Keyer, two key jacks are provided, one on the front and one on the rear panel, for
convenient connection to keying devices.
The Menu selections permit conguring the front panel
KEY
jack according to the device connected. For example, a
keyer paddle may be connected to the front panel
KEY
jack, and Menu item “
012 KEYER TYPE
used to select paddle
input.
The
KEY
jack on the
FT-991
utilize “Positive” keying voltage. Key-up voltage is approximately +3.3V DC, and key-
down current is approximately 4 mA. When connecting a key or other device to the
KEY
jack, use only a 3-contact
(“stereo”) 1/4” phone plug; a 2-contact plug will place a short between the ring and shaft (ground) of the plug, resulting
in a constant “key-down” condition in some circumstances.
Single key/Double-speed key Manipulator
DOT DASH COMMON
DOT DASH COMMON
KEY
KEY
NC GND
GND
If the Keyer plug is removed from the jack while the
FT-991
is in operation,
the
FT-991
may be switched to the transmit mode.
Turn off the power of the
FT-991
before connecting or disconnecting the Keyer.
17


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