ALC on line in?

[WW3S]

Is it possible to display ALC while using the line in jack on the rear panel? Trying WSJT-X , DATA-A mode, and while I have power out, no ALC is displayed, and I’m concerned about overdriving.....
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[Joe Subich, W4TV-4]

ALC display is independent of audio input (front mic, rear mic or
line in).  Press [hold] the DISP/METER button to toggle between
CMP/ALC and SWR/PWR displays.

> Trying WSJT-X , DATA-A mode, and while I have power out, no ALC is
 > displayed, and I’m concerned about overdriving

JT modes are AFSK - one tone at a time with phase continuous, zero
crossing transitions.  They are designed for operation with class C
(saturated) amplifiers so unless you overdrive the mic preamp and
cause clipping before the mic gain control in most transceivers it
is nearly impossible to create distortion.

That said, simply adjust the audio input level for *four bars* on
the ALC scale *as documented in the K3/K3S Owners Manual* (using
a combination of the Windows Mixer output for your soundcard, the
output level control (if any) on your interface and the MIC Gain
encoder on the K3/K3S) for any digital mode.

73,

    ... Joe, W4TV


On 1/22/2017 9:39 AM, Jamie WW3S wrote:

> Is it possible to display ALC while using the line in jack on the rear panel? Trying WSJT-X , DATA-A mode, and while I have power out, no ALC is displayed, and I’m concerned about overdriving.....
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> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Don Wilhelm]

Jamie (and all),

I post this information frequently.

Adjust the audio input level to produce 4 bars solid on the ALC meter
with the 5th bar flashing.

That usually means setting the soundcard output slider on the computer
to about 75% and then adjusting the K3(S) MIC GAIN (actually LINE IN
gain) to produce that condition.
The onset of ALC is indicated by the 5th bar on the ALC meter.

Adjust the desired power output level with the POWER knob (not the audio
level).

Elecraft transceivers control power differently than other amateur
transceivers - set the K3 as indicated in the manual and ignore the
internet advice (and some software instructions) which would have you
set the power to full and adjust the power output with the audio level.
That does *not* work with Elecraft transceivers.  To do so will result
in erratic power output.

73,
Don W3FPR

On 1/22/2017 9:39 AM, Jamie WW3S wrote:
> Is it possible to display ALC while using the line in jack on the rear panel? Trying WSJT-X , DATA-A mode, and while I have power out, no ALC is displayed, and I’m concerned about overdriving.....
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