[Elecraft] K1: KAT1 Auto-Tune Feature That I Just Noticed

[Ralph Tyrrell]

Mike:
Thanks for your e-mail. Something new learned that was
old. I built my K1 in 2003, my only HF rig at present,
I never knew this.
This is what makes this reflector  so useful.

73, Ty, W1TF, K1 #1423

 
--- Mike Morrow <kk5f at earthlink.net> wrote:

> This topic will be old stuff for most K1 users, but
> it was
> new to me.  I've had a K1 with KAT1 for 7 years. 
> After all
> that time, it was only last week that I found that
> the firmware
> controlling the KAT1 (version 1.3) is more versatile
> than I
> realized.
> 
> The KAT1 manual describes the use of the Auto-Tune
> function
> (KAT1 ATU mode set to "tun") as follows:
> 
> Quote
> • Enter TUNE mode. Power will be reduced to about
> 1.5 watts and
>   displayed briefly, then SWR will be displayed
> while the ATU
>   matches the transmitter to the load (usually 1-5
> seconds)...
> • When you no longer hear any relays switching,
> tune-up has
>   completed, and the final SWR is displayed. At this
> point you
>   can optionally tap WPM+ or WPM- to change the
> selected power
>   level...
> Unquote
> 
> But what actually happens if WPM+ or WPM- is tapped
> after ATU
> relay operation stops (and SWR is still displayed)
> is better:
> 
> 1.  Output power changes from the low level used for
> auto tune-up
>     to the power level that the K1 has been set to
> put out.
> 2.  The LCD displays the actual power output, and
> NOT the power
>     selected, as implied by the manual.  (Actual
> power output may
>     be lower than the power that was selected if,
> for example, the
>     K1 supply voltage is low, or filter board
> alignment is
>     slightly off.)
> 3.  As WPM+ or WPM- is pressed, the display of
> actual power output
>     changes as the selected power level changes.
> 
> The way that this works (as opposed to the way it is
> described) is
> very useful and well-designed.  I should have
> discovered this years
> ago.
> 
> Mike / KK5F
> (K1 SN 175 ... Still my favorite QRP rig)
> _______________________________________________
>


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