[Elecraft] KXPA100 Intermittent VSWR Issues

[Matt VK2RQ]

Are you running the latest KXPA100 firmware (v1.32)? If so, and you are still experiencing problems, then contact the Elecraft support team. Even though those guys are very efficient, they can't fix problems they don't know about.

73,
Matt VK2RQ

> On 9 Dec 2014, at 10:35 am, Dan Baker <km6cq at km6cq.com> wrote:
> 
> 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
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