Good question, Rudolf, but no the ATU is not engaged.
> Hi Brian,
>
> Just an "idiot" question: are you using the K3 ATU?
>
> 73, Rudolf HB9ARI
>
> Don Wilhelm wrote:
> > Brian,
> >
> > Is the higher reflected power indicated on the K3 or is it the reading
> > on a meter in the line between the amp and the antenna?
> >
> > If it is read on an external meter --
> > Is there any possibility that something is arcing over at high power -
> > check your antenna system for that condition.
> >
> > If the indication is on the K3, then the problem is in the input circuit
> > for the amp (giving a non-50 ohm resistive load to the K3).
> >
> > 73,
> > Don W3FPR
> >
> > Brian Machesney wrote:
> >
> >> I'm feeding a "double L" antenna on 160m (visualize a vertical dipole
> with
> >> the top and bottom legs bent to form something like a capital "C" and
> fed in
> >> the middle of the vertical leg). The SWR bridge on the K3 shows 1:1 SWR,
> but
> >> when I fire up my Alpha 91B, I see significant reflected power.
> >>
> >> I recently saw a post on the topband reflector from another K3 owner
> whose
> >> 160m output power is being reduced from 100W to 50W by the K3 even
> though
> >> the SWR reads 1:1 on the K3's internal SWR bridge.
> >>
> >> Has anyone else seen this or have an explanation for it?
> >>
> >>
> >>
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