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MIC
Connection for rear-panel microphone. Bias and gain for the rear-
panel mic can be set up independently from the front panel mic. Tap
<TX> primary function button, then the <MIC INP> and <MIC
CFG> secondary function buttons.
RS-232
This DE9 connector provides a true-RS232 COM port that can be used
for remote control of the K4. The K4 can also emit Auto-Info (AI)
frequency data on this port for use with external devices such as
antenna controllers.
To configure the data rate for this port, set up transmit functions for
the RTS and DTR lines (PTT or KEY), or configure it for auto-info (AI),
use the corresponding Serial RS232 menu entries.
PTT IN
RCA jack for use with external PTT controls, e.g. a foot switch or
station controller. Pull this input to ground (0V) to key the transmitter.
Additional PTT 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.
KEY OUT
RCA jack that provides a keying output signal for use in keying
amplifiers or other station gear. The signal goes low (0V) when the K4
is keyed by any method.
IMPORTANT: To configure this output to match the requirements of
external equipment, use menu entries TX DLY, KEY Out to RF Out. and
TX DLY, Unkey to Receive. The first may be needed to prevent
transmit artifacts on key-down, and the second may be needed to
prevent receive artifacts on key-up. Please read the detailed
explanations in the menu section.
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