ELECRAFT K4 - Page 19

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Note: If you're controlling an Elecraft KPA500 or KPA1500
amplifier from the K4 via the 15-pin accessory cable, you normally
won't need to use a separate KEY OUT cable. There are exceptions
to this; refer to the key line interrupter information in your
amplifier manual.
PADDLE
1/4" (6.35 mm) keyer paddle input jack. The dot and dash inputs on
this jack activate the K4's built-in CW keyer.
To set up Iambic keying mode, reverse the dot/dash paddles, or adjust
keying weight, tap the <TX> function button, followed by the
<PDL>, <IAMB>, or <WEIGHT> buttons. Applicable modes include CW,
FSK, and PSK.
KEY
1/4" (6.35 mm) keying input jack for use with a hand key, bug,
electronic keyer, or other keying device.
Additional KEY input sources can be defined using MENU: Serial IO
functions for USB-PC1, USB-PC2, and RS232. The DTR and/or RTS
signals from any of these ports can be used in any combination.
ACC
Accessory IO connector (DE15). This connector provides a number of input
signals for use in controlling the K4, as well as outputs for controlling
amplifiers, antenna switches, and other external equipment. The list below
summarizes these functions; refer to the Introduction to the Elecraft
K4 manual for further details.
Pin Description
1 FSK IN (active low); can be used in FSK mode (also see RS232 and
USB ports)
2 AUXBUS in/out; controls Elecraft amps, transverters, and the KRC2