Stewart,

If you are driving a dummy load and have the tuner in TUNE, you still 
have do do a TUNE into the dummy so the ATU remembers the setting for 
that band segment and into that dummy load.  Remember that with the K3 
ATU, the bands are segmented, so if you QSY beyond a band segment, you 
will have to re-tune.

73,
Don W3FPR

GW0ETF wrote:
> Maybe someone can answer this.....
>
> Still trying to understand the K3 atu and why I still get random high swr
> readings on some bands into a dummy load; when I switch in BYPASS I hear a
> relay switching but I've never located this relay *or* the associated BYPASS
> circuitry on the schematics, ie. I can't work out what BYPASS is actually
> doing at the circuit level.
>
> Anyone know??
>
> Stewart Rolfe, GW0ETF
>   
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