[Elecraft] KXPA100 Intermittent VSWR Issues

[Jim Kutsch, KY2D]

I'm experiencing the same thing but mostly on 40 meters where the best match
with the ATU isn't as good as on other bands. It *SEEMS* to have started
Saturday when I installed the latest KX3 beta and set compression to 20. The
antenna is a Carolina Windham.

73, Jim, KY2D
.


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
Stahl via Elecraft
Sent: Sunday, December 07, 2014 10:08 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KXPA100 Intermittent VSWR Issues

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 jim.kutsch at ky2d.com