[Elecraft] KX3 SWR issue

[Brian Collamer]

Hi Bert

I set VFO B display to monitor the PA temp and if I see it get near 50°C I
turn on a fan.

I've got one of Howards heatsinks but haven't installed it yet....

Looks like a like I tried to post originally didn't make it:

https://www.youtube.com/watch?v=cwxk4E01IfM

73

Brian


On Sat, Dec 6, 2025 at 10:50 AM n4cw at aol.com <n4cw at aol.com> wrote:

> Brian, have you tried reducing power  output to 2.5 to 3 Watts (maximum)
> and see if this problem persists? I had recurring shutdown with my KX3 in
> PSK mode (also digital) until I realized it was going "over temperature"!
> So I installed a Pro-Audio Engineering external heat sink and never had a
> problem again!
> Just a thought...
> 73, Bert N4CW
>
> On Saturday, December 6, 2025 at 09:12:24 AM EST, Brian Collamer via
> Elecraft <elecraft at mailman.qth.net> wrote:
>
>
> Hi All
>
> I've noticed that at the end of a FT8 transmission, the SWR will jump
> and if I've told WSJTx to monitor the SWR and stop TX if it's > than 2.5
> it will stop transmitting. Thought I had a bad connection in my antenna
> but everything looks ok.
>
> Any idea if Elecraft knows about this?
>
> 73
>
> KB1OPD
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