[Elecraft] Fwd: [K3] Weird behavior on 17m

[george allen]

I have seen this issue with several different radios and traced the problem to RF feedback.  When you run high power, RF can get into everything in the world.  You will need to do some enhanced grounding and put split-ferrite cores on all cables.

I first encountered this while on a dxpedition to Bequia ( St. vincent and the Grenadines) as J8K2CM.  I could not get a good ground...so had to limit my power to 25 watts.  More power than that and the radio would hang up.

I have seen this on both my K3 and Flex 6700. No problem with the barefoot KX3.

George
K2CM

Sent from my iPad

> On Sep 27, 2016, at 3:50 AM, Steve Ward <stevewa88 at gmail.com> wrote:
> 
> Helps to send to the proper address.
> ---------- Forwarded message ----------
> From: "Steve Ward" <stevewa88 at gmail.com>
> Date: Sep 25, 2016 5:17 PM
> Subject: [K3] Weird behavior on 17m
> To: <elecraft-request at mailman.qth.net>
> Cc:
> 
> During the CQWW RTTY contest just concluded I happened to accidentally QSY
> to 17m and my radio basically locked up in transmit mode, it'd "blip" into
> RX every second or so, but go right back to TX before I could do anything
> to stop it.  The only way out seems to be the band selector buttons on the
> KPA500 which allowed me to switch back to 20m.
> 
> I checked all the other bands and did not observe this behavior, it's only
> 17m.  I'm at a total loss as to what is happening as it doesn't appear to
> have anything to do with the computer interface (I unplugged the USB cable
> from the rig and the problem persists).  It may be the case the problem has
> been with me a long time as my antenna is not resonant on 17, so I hardly
> every go there.
> 
> Corrupted config or firmware maybe?
> 
> Thanks,
> 
> Steve AD7OG
> K3 sn 1544
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