...clarification required... PWR Setting on K3

[John Ragle]

  Referring to my K3/100 Ser. No. 4103:

    What, exactly, is the number (in watts) that is displayed when the
front panel "PWR" knob is set to a particular number? Is it actually a
measured power out (and with what accuracy)? Is it something set and
calibrated in the firmware?

     Is there any way to get at settings between about 8.5 Watts and
about 13, which is where there is a discontinuity as one advances the
knob (short of putting in a pad and adjusting the attenuation on the
output manually)?

     The numbers on the display around 10 watts do not agree very well
with my Bird 43 and a 25 watt slug. Which of these should I believe, and
again with what accuracy? [I know the Bird is only accurate to within ca
5% of fs.] Please note that I am differentiating between accuracy and
precision here.

John Ragle -- W1ZI
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[Ken Wagner K3IU]

  G'morning John:

The number displayed when one adjusts the PWR knob is a
COMMANDED power level. If the K3 has been calibrated using
the procedures in the manual, then the power out will be
what is commanded, assuming a 50 ohm resistive load.

My K3 commands powers between 8.5 and about 13 with no
problem. Six meters used to not be able to do that, but a
recent firmware upgrade solved that problem on 6 meters.

73,
Ken K3IU
K3 #202
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 9/13/2010 8:51 AM, John Ragle wrote:

>    Referring to my K3/100 Ser. No. 4103:
>
>      What, exactly, is the number (in watts) that is displayed when the
> front panel "PWR" knob is set to a particular number? Is it actually a
> measured power out (and with what accuracy)? Is it something set and
> calibrated in the firmware?
>
>       Is there any way to get at settings between about 8.5 Watts and
> about 13, which is where there is a discontinuity as one advances the
> knob (short of putting in a pad and adjusting the attenuation on the
> output manually)?
>
>       The numbers on the display around 10 watts do not agree very well
> with my Bird 43 and a 25 watt slug. Which of these should I believe, and
> again with what accuracy? [I know the Bird is only accurate to within ca
> 5% of fs.] Please note that I am differentiating between accuracy and
> precision here.
>
> John Ragle -- W1ZI
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[David Pratt]

Presumably you are referring to 50MHz.  Yes, upgrade to the latest
version 4.10 beta software.  This enables the KPA3 to be switched in at
9W on 50MHz.

73 de David G4DMP

In message <[hidden email]>, John Ragle
<[hidden email]> writes
>     Is there any way to get at settings between about 8.5 Watts and
>about 13, which is where there is a discontinuity as one advances the
>knob (short of putting in a pad and adjusting the attenuation on the
>output manually)?
--
David Pratt



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