SPKRS
STEREO or MONO; 4 to 8 Ω
Plugging in external speaker(s) cuts off the internal
speaker. A stereo plug is recommended; tip is left
speaker, ring is right. If you must use a mono plug,
set CONFIG:SPKRS to 1 to disable right-channel
audio. (This will result in mono headphone output,
as well, if you also set SPKR+PH to YES.)
If the speaker is not working with
headphones unplugged: Locate the CONFIG:
SPKR+PH menu entry. Tap 1 on the numeric
keypad until you see PH.R SW– (specifying
inverted logic for the rear headphone jack). This is
the default setting, required for the K3S.
PHONES
STEREO or MONO; 16 Ω min. recommended
The front and rear-panel headphone jacks are both
isolated with series resistors. This allows you to use
mono phones on one jack and stereo on the other, if
required. You’ll need stereo phones for AFX (audio
effects) and stereo dual receive (with sub receiver).
You can plug in headphones and speaker(s) at
the same time, and hear audio in both, if you set
CONFIG:SPKR+PH to YES. However, if you set
CONFIG:SPKRS to 1, setting SPKR+PH to YES
will result in mono output for both headphones and
speakers. You can set SPKRS to 2 if you use a
stereo plug at the external speaker jack, or if no
external speaker is plugged in.
MIC
MONO; hi- or low-Z
This jack accommodates an electret or dynamic
mic. Use MAIN:MIC SEL to select the rear panel
mic (RP). Tap 1 to turn on Low or High mic gain
range. Tap 2 to turn bias on/off (see pg. 30 for
recommendations based on mic type).
For the front-panel mic only, additional microphone
gain can be enabled by tapping 7 . Use this only for
very low-output mics. Not required for use with
the Elecraft MH2.
If the rear-panel mic has a PTT line, it can be
connected to either the PTT IN jack or the PTT
input on the ACC connector (pg. 20).
LINE IN
MONO, transformer-isolated; 600 Ω (nominal)
The LINE IN jack on the K3S can be connected to
your computer’s soundcard output. (It is preferable
in most cases to obtain line-in audio via the USB
cable. See pg. 18.)
If a plug is inserted into LINE IN at the K3S, this
line input will override the USB port’s line-in.
The MIC gain control on the K3S sets the line
input level when the MAIN:MIC SEL menu entry is
set to LINE IN.
The LINE IN level should be set carefully to
avoid transmit signal distortion due to
saturation of the input audio transformer. In
addition, computer sound card gain should be set 6
to 10 dB below the level at which the sound card’s
output stage starts clipping.
LINE OUT
STEREO, transformer-isolated; 600 Ω (nominal)
LINE OUT can be connected to your computer’s
soundcard inputs. (However, this is not necessary if
you’re using the USB port for line-level audio.)
Normally, the left channel is main receiver audio,
and the right channel is sub receiver audio (if
applicable). In this case the outputs are post-AGC
but pre-AF-gain.
Use CONFIG:LIN OUT to set the level, or to
switch from a fixed-level setting to =PHONES.
LIN OUT settings above 10 are usually not
necessary. This can in some cases cause
overloading of either the output transformers in the
K3S or the PC soundcard inputs (typically on noise
peaks). Either could degrade the performance of
demodulation software.
Some computers have only very high-gain,
high-impedance microphone inputs, not line-level
inputs. This can make it difficult to adjust the
LINE OUT level, and can also worsen noise
pickup. If a high-impedance mic input must be
used, you can add a resistive attenuator between the
K3S and the mic input to improve signal-to-noise
level.
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