[Elecraft] KXPA100 Intermittent VSWR Issues

[Cady, Fred]

Are you using AUTO or MAN mode?  You should be using MAN mode after training the tuner.
Cheers,
Fred KE7X


> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> Dan Baker
> Sent: Monday, December 08, 2014 4:36 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KXPA100 Intermittent VSWR Issues
> 
> Mine does the same thing all the time, so much that I do not like to
> using the tuner any longer.
> I confirmed it was tuner in the amp by operating into a dummy load. Its
> does it into the dummy load on CW and SSB. I have not said anything,
> thinking an update will be pushed out and the problem will disappear.
> In the meantime I use the KAT500. Its all to frustrating to be in a QSO
> and have it act up. It kind of behaves like the KAT500 did before they
> upgraded the firmware. I am sure they will get around to taking care of
> it.
> 
> 73,   Dan KM6CQ
> 
> 
> I've run into several occasions where in mid-CW transmission my KXPA100
> (with internal tuner) SWR takes a momentary jump from matched to maybe
> 3:1. I see the SWR jump on both the KXPA front panel LEDs and on  the
> KX3 VSWR display.  It lasts for maybe half a second, I hear  several
> clicks of the relays in the tuner, and them it's back to normal. When
> normal the SWR is pretty much 1:1 on the KX3, and the second green LED
> lit on  the KX3. I've not seen it happen at the start of a
> transmission, but  rather several characters into a CQ or exchange..
> 
> In the ARRL 160 contest Saturday night this was happening perhaps once
> every 2-3 minutes. I'm using a fairly well matched antenna - not random
> wires.
> I  also encountered this problem on 15 meters when operating from
> W1AW/8 in WV  in October. In both cases I was running a pretty high CW
> duty cycle while  running at a pretty good clip. The amp was warm, but
> the heat sink air flow is not blocked.
> 
> Any thoughts?
> 
> 
> 73  -  Jim  K8MR
> 
> 
> --
> KM6CQ
> Dan Baker
> www.km6cq.com
> @danielbaker
> DM09dn
> SKCC: 8260  NAQCC: 6817
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