Re: K3: Odd ALC behavior

Posted by Steve Lund on Aug 03, 2017; 11:00pm
URL: http://elecraft.85.s1.nabble.com/K3-Odd-ALC-behavior-tp7633052p7633063.html

Dave,

I have exactly the same problem. For me it does not occur with RTTY. That
seems to be solid. JT65 and FT8 really show the problem. When the problem
occurs I can often make a RTTY transmission and suddenly the ALC shows for
FT8/JT65.

I have multiple soundcards in my computer and in theory the windows
'sounds' are going to another soundcard. But, it has always seemed like the
problem occurs after I've gone on the internet and a website has sound on
it.

I'm going to try K4TAX's solution. When 'working' my K3 Line In is 4 or so;
WSJT-X is 70% and Speaker is 100%.

Let us know if you get a stable solution.

Steve, K6UM

On Thu, Aug 3, 2017 at 1:25 PM, Dave Cole <[hidden email]> wrote:

> Hi,
>
> I have an issue in  regards to obtaining 4 bars, and getting the 5th bar
> of ALC to fluctuate while transmitting JT65.
>
> I have plenty of audio, and can drive the ALC to 6 or more bars if I turn
> things up.  However, as I get to 4 bars with the 5th flashing a bit, the
> ALC starts to fluctuate between nothing and 4 or 5 bars...
>
> That is to say, the ALC just goes to zero, no visible ALC, and then teh
> ALC returns to 4 or 5 bars.  This happens across a one or two second time
> span.
>
> The ALC is at zero more than it is above zero most of the time.  If I run
> it to five bars, with the fifth fluctuating, all is well, there seems to be
> some sort of threshold at the 5th bar of ALC...
>
> I have tried a number of things to try and triage this...  For instance:
>
> 1.  Running in "Transmit Test" mode to eliminate RF feedback.
> 2.  Upping the audio level feeding the K3.
> 3.  Reducing the audio level feeding the K3.
> 4.  Upping the line in on the K3 setup.
> 5.  Reducing the Line in on the K3 setup.
> 6.  Adjustment of the WSJT-X output level control, under conditions 2
> through 5 above.
>
> In all cases the above described behavior of the ALC dropping to zero does
> not change in any way if I am at 5 or less bars.  That is to say, if I take
> the ALC level to 4 bars, it starts dropping to zero more than not...
>
> Does anyone have any suggestions as to what this might be?
>
> A a bit of history-- the computer and sound card were used on an Icom 756
> ProIII, and there was never an issue like this...  The ALC was adjustable
> from zero to too much on the Icom, with no dropouts...
>
> --
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
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