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LINE IN
This is an analog audio input (nominally 600 ohms) for connection to
computers or other station equipment that supply transmit audio to the
K4. An example of this is a software application that supplies data-mode
audio signals, e.g. FT8, RTTY, or PSK31. In voice modes, LINE IN can be
used in lieu of, or in conjunction with, microphone audio; see TX button
description.
Most computer software can alternatively provide LINE IN signals from
a virtual COM port, eliminating the need for analog cabling and
potentially reducing noise. See description of rear-
panel USB connector, above.
LINE OUT
This is an analog audio output (stereo; nominally 600 ohms) for
connection to computers or other station equipment that obtain receive
audio from the K4. An example of this is a software application that
demodulates data-mode audio signals such as FT8, RTTY, or PSK31, as well
as CW signals.
Receive audio is always present at both the analog LINE OUT jack and
the soundcard output (see USB). If the sub receiver is turned on, the
right channel supplies sub-RX audio. If the sub RX is turned off, then
right-channel audio is identical to left (main RX). Also see MAIN
RX button description.
Most computer software can alternatively accept LINE OUT signals
from a virtual com port, eliminating the need for analog cabling and
reducing noise. See description of rear-panel USB connector, above.
Note: Windows Sound Control Panel does not accurately show sound input
level. The correct levels are shown by WSJT, MMTTY, and other apps.
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