KX3 SWR display when used with KXPA100

[Edouard Lafargue]

  A quick question:

 I use a KX3 + KXPA100 as my QTH setup.

 I recently did work on my QTH antenna, and the SWR indicator on my KX3 now
jumps around a lot when transmitting on digital modes, with peaks up to
2/3. As does the power output. Audio levels are good though, same as usual.
And when looking at the KXAP100 SWR LED indicator, it stays at "1" and does
not fluctuate at all. The antenna is well tuned for 20m and the ATU is able
to take SWR to 1.1 or 1.0 on that band.

  I am a bit confused: shouldn't the KX3 and KXPA100 SWR indicators show
the same values? Does the KX3 SWR indicator only indicate the link between
the KX3 and the amplifier? In which case it should remain at a steady "1"
all the time, nothing has changed on my KX3-KXPA100 link... Can someone
shed some light on this behaviour to understand what's going on?

   Ed

W6ELA
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[Edouard Lafargue]

  And as a quick follow-up: when my KXPA100 is off - and my understanding
is that when it is off, it is bypassed with a relay - then I get a very
high SWR on my KX3, whereas if I connect my antenna to the KX3 directly,
then I have a great tuning...

Ed

On Tue, Sep 1, 2015 at 4:18 PM, Edouard Lafargue <[hidden email]>
wrote:

>
>   A quick question:
>
>  I use a KX3 + KXPA100 as my QTH setup.
>
>  I recently did work on my QTH antenna, and the SWR indicator on my KX3
> now jumps around a lot when transmitting on digital modes, with peaks up to
> 2/3. As does the power output. Audio levels are good though, same as usual.
> And when looking at the KXAP100 SWR LED indicator, it stays at "1" and does
> not fluctuate at all. The antenna is well tuned for 20m and the ATU is able
> to take SWR to 1.1 or 1.0 on that band.
>
>   I am a bit confused: shouldn't the KX3 and KXPA100 SWR indicators show
> the same values? Does the KX3 SWR indicator only indicate the link between
> the KX3 and the amplifier? In which case it should remain at a steady "1"
> all the time, nothing has changed on my KX3-KXPA100 link... Can someone
> shed some light on this behaviour to understand what's going on?
>
>    Ed
>
> W6ELA
>

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[Don Wilhelm-4]

Ed,

Have you considered that possibly the bypass relay in your KXPA100 is
not making proper contact?  Or that there is some other failure in your
KXPA100.  I would suggest contacting [hidden email] for additional
analysis.

73,
Don W3FPR

On 9/1/2015 7:37 PM, Edouard Lafargue wrote:
>    And as a quick follow-up: when my KXPA100 is off - and my understanding
> is that when it is off, it is bypassed with a relay - then I get a very
> high SWR on my KX3, whereas if I connect my antenna to the KX3 directly,
> then I have a great tuning...
>
> Ed
>
>

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[Bob N3MNT]

Check the coax between the KX3 and the KXPA100.