[Elecraft] KX3 SWR meter accuracy on 50 MHz?

[Drew Arnett]

I did before shipping in for repair with a directional coupler.  Looked great.

On Sat, Sep 12, 2020 at 7:13 PM Nr4c <nr4c at widomaker.com> wrote:
>
> Well, it depends on the “Dummy” load.  Have you swept the load with a good spectrum analyzer or VNA?  It may not be 50 ohms at 50 MHz
>
>
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On Sep 12, 2020, at 11:51 AM, Drew Arnett <arnett.drew at gmail.com> wrote:
> >
> > After getting my KX3 back from repair (before my next planned contest
> > operation, thanks!), I ran some measurements to both see how great the
> > repairs were and to get a new baseline for future measurements.  TX
> > efficiency problem was gone.
> >
> > However, I'm left to wonder about the accuracy of the internal SWR
> > meter for 50 MHz.  Using a microwave dummy load of adequate power
> > rating and just a coaxial adapter, I measured the following:
> >
> > 14 MHz @ 1 W setting
> > VSWR 1.0 to 1 (per KX3)
> >
> > 28 MHz @ 1 W setting
> > VSWR 1.0 to 1
> >
> > 50 MHz @ 1 W setting
> > VSWR 1.5 to 1
> >
> > 50 MHz @ 4 W setting
> > VSWR 1.6 to 1
> >
> > Not horrible.  Not great.
> >
> > It's fine if it's not as accurate on 50 MHz.  I just want to know if
> > this is normal.  Has anyone else looked at that and can share what
> > they see?
> >
> > Thanks and best regards,
> >
> > Drew
> > n7da
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