[Elecraft] KXPA100 Intermittent VSWR Issues

[Matt VK2RQ]

I had a similar issue earlier in the year, and there was a firmware fix for it, so I suggest you upgrade your KXPA100 to the latest firmware.

73, Matt VK2RQ

> On 8 Dec 2014, at 2:07 pm, Jim Stahl via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> 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
> 
> 
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to matt.vk2rq at gmail.com