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

[Harry Yingst]

Yes The Cal TPA is still there and needs to be done.

What is not there is the TPA setting under the PA menu item that did
allow you to display the heat sink temp.



--- Ken Wagner <kewagner@ids.net> wrote:
> 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.
> 
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=====
Harry - AB2PN

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