[Elecraft] KX3 and Digital Modea

[Jim Rogers]

I have adopted a plan in that regard. On digital modes I run my K3/100 
adjusted to the point the PA just kicks in (around 12-13 watts). At that 
point the 100W PA is loafing along and as far as I can determine 
exhibits no overheating no matter how long a transmission I make on 
PSK31 or any of the digital modes. I believe the 100W PA to be fixed 
gain and the lower drive requirements at that power level lets the 10W 
driver amp in the K3 loaf along at a significantly reduced level.  
Perhaps WSPR frowns on such "high power" and this would not be applicable?

73s, Jim W4ATK
K-Line


On 7/20/2015 8:28 AM, 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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