K3 Transmitter gain

[John Lemay]

Hello all

It's several months since I assembled my K3. There have been half a dozen
software revisions in that time, all of which I have loaded. Some of the
revisions have been aimed at improving power control.

Should I run through the TX gain calibration process again to get the most
benefit from the revised software ?

Thanks

John G4ZTR
 

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[Julian, G4ILO]

John Lemay wrote

Hello all

It's several months since I assembled my K3. There have been half a dozen
software revisions in that time, all of which I have loaded. Some of the
revisions have been aimed at improving power control.

Should I run through the TX gain calibration process again to get the most
benefit from the revised software ?

I run the TX gain calibration process as a matter of principle after installing any firmware update. It can't do any harm and it may - due to internal changes within the firmware - make a difference. If you use the wizard in the latest Elecraft Utility it takes next to no time.

[Ken Kopp-3]

John,

I've loaded all versions of the firmware as they've become
available, and I only have the following observation / complaint ...

Up until the current, or maybe the next-to-last version, the
output power of my K3 as displayed agreed with my several
Birds and was -well- within the 5 - 6% accuracy range of the
Birds.  I've also made the dummy load / voltmeter / 'scope
measurements, with the same results.  (Please guys, I -do-
know the "traps" here, so no tutorials are needed.)  Yes,
I -do- know the difference would not be measurable on the
"other end", too.

I've repeatedly run the calibration procedures and still see
a 10 to 15 watt disparity on all bands, including 6M, where
there's another Bird in that band's antenna line.  This is one
of those "it worked fine, and now it doesn't" things and I hope
it gets fixed soon.

So John, if power display accuracy is important to you, I'd
maybe not make the firmware upgrade.

73! Ken Kopp - K0PP
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