[Elecraft] K3/AL-811 questions

[John Shadle]

I should also note that sometimes the amp simply being powered on (not in
OPER position, but just ON) has flipped my GFCI. This has happened a few
times.

So odd. And annoying, since my computer is also plugged in there--which
requires a restart! ;-)

-john W4PAH


On Fri, Aug 9, 2013 at 11:46 AM, Jim Bennett <w6jhb at mac.com> wrote:

> John -
>
> I've got an AL-811 but this (luckily) has not happened to me. I suggest a
> call to Ameritron / MFJ, as it sounds like a component in the input
> circuitry in the amp has gone flakey: able to withstand low amounts of RF
> but fails under higher power. I had an issue with my AL-811 not being able
> to load up on 80 meter CW - they were extremely helpful on the phone.
>
> Jim / W6JHB
>
>
> On Aug 9, 2013, at 8:37 AM, John Shadle wrote:
>
> > Hi all,
> > This could be tangentially related to a K3 issue, or maybe K3 experts can
> > give some insight here. FYI, when I am not using the amp, I can get 100W
> > from my K3 with no problem. Please keep reading...
> >
> > I have been using my AL-811 (not new, but new to me) successfully at 500W
> > for the past few weeks. Recently (actually, the second time this has
> > happened), my fuses both blew and I replaced them. Since I replaced them,
> > behavior has not been typical. I can't get anything over 200W (most is in
> > the 175W range). I use a tuner after the amp, and I know that the antenna
> > is matched quite well to the amp, but my SWR meter on my rig (K3) is
> > showing a high value.
> >
> > When I tune up at 20-25W I can get about 100W out from the amp. When I
> move
> > to 50-65W I get < 200W. And there is clicking. I can't tell if it's a
> relay
> > or if it's something else.
> >
> > So, the main issues are
> > 1. High SWR from the rig to the amp (when the antenna is < 2:1 SWR to the
> > amp)
> > 2. Low power from the amp to the antenna
> >
> > Happy to provide other information if folks have ideas on where to look.
> >
> > Thanks.
> > -john W4PAH
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