Posted by
GM4JJJ on
Oct 25, 2015; 9:19am
URL: http://elecraft.85.s1.nabble.com/K2-Unstable-power-output-on-40m-digital-modes-tp7609533p7609534.html
Brian,
The Elecraft K series requires a different way of setting power out on digital.
You increase the audio drive from the SignaLink until the "ALC" meter is showing 4 to 5 bars and then adjust the power control to set the required power out, do not use the audio level to adjust the power.
The "ALC" meter is actually just an audio level meter until the 6th bar when actual power reducing ALC starts.
I know this apparently goes against normal advice to not have any ALC showing, but in effect you are not because of the way the "ALC" meter on the K series is configured. There is no ALC action until the 6th bar of "ALC".
If you don't have sufficient audio (4 to 5 bars of "ALC" ) then the radio power output will be unstable as you have described.
73
David Anderson GM4JJJ
> On 25 Oct 2015, at 05:45, Brian - N5BCN via Elecraft <
[hidden email]> wrote:
>
> No problems tuning any band including 40m. When using digital modes, power
> output and ALC action (no bars) appears normal on 10 through 30m, and even
> works ok on 80m. Haven't tried 160m.
>
> However, when attempting digital modes (using a Signalink) on 40m, power
> output and ALC action is "all over the place" and generally folds back to a
> couple of watts. The output also seems to be extremely "touchy" and
> sensitive to the TX drive setting on the Signalink that's not apparent on
> other bands. I don't see this craziness using a dummy load, so I'm
> suspecting maybe I'm getting RF feedback only on 40m for some reason.
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