High SWR problem

[Rob May-2]

All has been fine with my K3 until today.  The display is indicating  "High SWR" when I transmit on SSB.  The KAT3 indicates a 1.0:1 match, but the when I transmit the swr meter is high and I get the high swr message on the screen.  If I turn it down to 5 watts and send a tone with Digipan, the swr is fine, but turn it up to 100 watts and the swr is back up.  Nothing obvious has changed, the antenna is 2:1 on my analyzer with no tuner.  If I bypass the antenna tuner, the bar graph meter on the K3 shows about 2:1.  But if I switch in the KAT3 and tune, it indicates 1.0:1 but when I transmit it's high.  I've swapped coax jumpers between the radio and the antenna with no difference.  Thanks for any suggestions.
Rob
NV5E

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[Don Wilhelm-4]

Rob,

You may have something in your antenna system that is arcing at high
power, but is working just fine at low power.

73,
Don W3FPR

Rob May wrote:

> All has been fine with my K3 until today.  The display is indicating  
> "High SWR" when I transmit on SSB.  The KAT3 indicates a 1.0:1 match,
> but the when I transmit the swr meter is high and I get the high swr
> message on the screen.  If I turn it down to 5 watts and send a tone
> with Digipan, the swr is fine, but turn it up to 100 watts and the swr
> is back up.  Nothing obvious has changed, the antenna is 2:1 on my
> analyzer with no tuner.  If I bypass the antenna tuner, the bar graph
> meter on the K3 shows about 2:1.  But if I switch in the KAT3 and
> tune, it indicates 1.0:1 but when I transmit it's high.  I've swapped
> coax jumpers between the radio and the antenna with no difference.  
> Thanks for any suggestions.
> Rob
> NV5E
>

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[Rob May-2]

Don,
I think you're right, it is an antenna problem.  No problems on a dummy load at any power.  Well, it's up to the roof.  Thanks.
Rob
NV5E

> Date: Tue, 21 Oct 2008 14:19:03 -0400
> From: [hidden email]
> To: [hidden email]
> CC: [hidden email]
> Subject: Re: [Elecraft] High SWR problem
>
> Rob,
>
> You may have something in your antenna system that is arcing at high
> power, but is working just fine at low power.
>
> 73,
> Don W3FPR
>
> Rob May wrote:
> > All has been fine with my K3 until today. The display is indicating
> > "High SWR" when I transmit on SSB. The KAT3 indicates a 1.0:1 match,
> > but the when I transmit the swr meter is high and I get the high swr
> > message on the screen. If I turn it down to 5 watts and send a tone
> > with Digipan, the swr is fine, but turn it up to 100 watts and the swr
> > is back up. Nothing obvious has changed, the antenna is 2:1 on my
> > analyzer with no tuner. If I bypass the antenna tuner, the bar graph
> > meter on the K3 shows about 2:1. But if I switch in the KAT3 and
> > tune, it indicates 1.0:1 but when I transmit it's high. I've swapped
> > coax jumpers between the radio and the antenna with no difference.
> > Thanks for any suggestions.
> > Rob
> > NV5E
> >

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