[Elecraft] FT8 output power KX2/KX3

[Walter Underwood]

The KX3 specifications in the manual (page 54) say 5 W for digital modes. I expect the KX2 specs also list a power level.

"Supply voltage of 11 V or higher (on key-down) required for settings above 5 W.
5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power will
automatically be reduced if PA temperature or current limits are exceeded."

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Oct 26, 2017, at 6:05 AM, Barry N1EU <n1eu.barry at gmail.com> wrote:
> 
> Thanks Tom and Don for the responses.  I'll try a few 15sec FT8 xmit cycles
> at 50% (7.5W) into a dummy load while monitoring PA temp.  Any guidance on
> what the upper safe limit is for PA temp?
> 
> Thanks & 73,
> Barry N1EU
> 
> On Thu, Oct 26, 2017 at 8:34 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
>> Barry,
>> 
>> The normal recommendation is for 50% of the maximum power.
>> The KX3 and the KX2 will roll back power for protection if the PA
>> transistors get too hot.
>> I know the KX3 rolls back to 5 watts, but I am not sure about the level
>> for the KX2.
>> 
>> 73,
>> Don W3FPR
>> 
>> 
>> On 10/26/2017 7:50 AM, Barry N1EU wrote:
>> 
>>> What is the recommended max power output setting for the KX2 and for the
>>> KX3 for normal FT8 use without after-market heatsink?
>>> 
>> 
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