.I tried my KX3 on digi modes and gave it up for this reason.  I could run my
FT-817 all day,but can't get 5 minutes from the KX3 at 5w..heck,I've even
had mine shut down running ssb on 6m outside in the summer.
Only "cure" I found was to run about 1 watt or less
Scott W0SGM


KM4VX wrote
> I am on my second KX3, having sold the first one and then  find myself
> missing it.  However, I now find the KX3 routinely overheats in digital
> modes. Specifically, at just 5 watts on WSPR with transmission time of 2
> minutes (as regulated by WSPR software) the KX3 overheats "HI TEMP" at a
> minute and a half, resulting in a safety shutdown of the rig. This radio
> has a wonderful built-in digital capability, but digital appears beyond
> the rig's ability, save CW which is my main digital interest anyway.  I
> would like to use the KX3 occasionally on PSK, JT65 and WSPR without the
> absurdity of having to buy an after-market heat sink to replace a factory
> installed heat sink. There is no guarantee the after-market one is
> superior, and it shouldn't be necessary since a radio with a digital
> capability should not need some after-market accessory to enable the
> advertised digital mode. I wonder if anyone has found a firmware or
> software answer to the over heating problem. The overheating problem
> happens regularly in digital modes and I believe comments about the KX3
> working correctly in digital are simply incorrect. This is not an antenna
> issue and not an SWR issue. Thanks Ron KM4VX





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