Key, Keyer, And Computer-Driven Keying Interconnections - Yaesu FTdx5000 Series Operating Manual

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The FT 5000 includes a host of features for the CW operator. These functions will be detailed in the "Operation" section
later. An Electronic Keyer is built-in, and two key jacks are provided, one on the front and one on the rear panel, for
convenient connection to keying devices.
The Menu system allows you to configure the front and rear panel KEY jacks 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 "054 A1A F-TYPE" for
paddle input, while connecting the rear panel KEY jack to the keying line from your personal computer (which emulates a
"straight key" for connection purposes), and configure the rear panel jack using Menu item "056 A1A R-TYPE".
Both KEY jacks on the FT 5000 utilize "Positive" keying voltage. Key-up voltage is approximately +5V DC, and key-
down current is approximately 1 mA. When connecting a key or other device to the KEY jacks, use a 3-pin ("stereo")
1/4" phone plug; a 2-pin plug will place a short between the ring and (grounded) shaft of the plug, resulting in a constant
"key-down" condition in some circumstances.
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