[Elecraft] Re: K2 fan turns on high with CW QSO 22 watts

[Ken Wagner]

Hi Andy:

I'm reasonably sure that you absolutely DO have to "calibrate" tPA. Follow 
the instructions in the KPA100 manual to set it. I don't recall seeing 
anything saying you no longer have to calibrate it.

Also... the fan will go into LOW speed only if you have the menu setting on 
"lo hi". In that setting it runs continuously in low speed until the heat 
sink temp reaches the switch point to turn on HIGH speed. If fan setting is 
in the normal setting, then the fan stays OFF until the switch point is 
reached when it turns on to HIGH speed.

Have FUN!!!
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~
At 09:24 AM 6/16/03, Andrew Moore wrote:


>>As we mentioned in the manual, the KPA100's final transistors are biased and
>>matched for best performance at 100 watts.
>
>I remember seeing that note and wondering about it.  Now I
>understand.  Thanks for clearing it up.
>
>>You said "Cal tPA is set to 32 deg. C." Did you mean that the ambient 
>>temp was
>>32 deg. C when you performed the tPA calibration step, or that when you 
>>noticed
>>the heatsink was warm, the value shown in CAL tPA was 32 degrees C?
>
>After I wrote that I remembered the manual stating that tPA calibration
>was not supported on later firmware.  The 32C was what I saw after
>the heat sink had cooled down a bit -- now I realize that it was probably
>just telling me the current PA temp, not the value that I had set
>during alignment (which apparently I didn't need to do).
>
>I don't recall the fan having gone into low speed mode first; I had
>the headphones on so I might not have heard.  I'll listen for it next
>time.