[K3] TX gain calibration

[Poul Erik Karlshøj (PKA)-2]

K3 ser. No 03674
MCU 4.39
Utility 1.2.12.28

I recently had to make a new TX gain calibration.  Apparently it was only 80m where the K3 every now and then  displayed  "High Current" and reduced the transmit power. Even when setting power to a low value (e.g. 25W) then the very first CW character would create an output signal >100W  and the High Current would briefly be displayed and the power then would be reduced.

The calibration went smooth and all is now again OK.

It might be interesting to compare the previous calibration result with the new one. Unfortunately I didn't save the old calibration result before making a new calibration and the results seem not to be automatically saved on the PC. Is that correct, also in more recent versions of the utility?

My main question, however, is: what could have changed over time in the K3 which in turn makes a new calibration required? Maybe someone in this group could make a complete list of the factors which could potentially have changed and making a new calibration required.

Vy 73
OZ4UN



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[Dick Dievendorff]

Results of the most recent calibration are saved in a folder under
%APPDATA%\Elecraft\K3 Tx Gain.  But only the most recent calibration.
There's no history of prior calibrations.

73 de Dick, K6KR


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Poul Erik Karlshøj
(PKA)
Sent: Wednesday, November 28, 2012 8:09 AM
To: [hidden email]
Subject: [Elecraft] [K3] TX gain calibration

K3 ser. No 03674
MCU 4.39
Utility 1.2.12.28

I recently had to make a new TX gain calibration.  Apparently it was only
80m where the K3 every now and then  displayed  "High Current" and reduced
the transmit power. Even when setting power to a low value (e.g. 25W) then
the very first CW character would create an output signal >100W  and the
High Current would briefly be displayed and the power then would be reduced.

The calibration went smooth and all is now again OK.

It might be interesting to compare the previous calibration result with the
new one. Unfortunately I didn't save the old calibration result before
making a new calibration and the results seem not to be automatically saved
on the PC. Is that correct, also in more recent versions of the utility?

My main question, however, is: what could have changed over time in the K3
which in turn makes a new calibration required? Maybe someone in this group
could make a complete list of the factors which could potentially have
changed and making a new calibration required.

Vy 73
OZ4UN



______________________________________________________________
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

______________________________________________________________
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