Yaesu FT-991, Operating Manual

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Page 10 F T-991 O
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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 allow you to configure the front panel KEY jack according to the device you wish to connect. For
example, you may connect your keyer paddle to the front panel
KEY
jack, and use Menu item “
018 F KEYER TYPE
” for
paddle input.
The
KEY jack on the FT-991 utilize “Positive” keying voltage. Key-up voltage is approxi3.3V 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 (grounded) shaft of the plug, result-
ing in a constant “key-down” condition in some circumstances.
i
nsTallaTion and
i
nTerConneCTions