K3 Output power difference

[Ken Kopp-3]

I recently loaded beta ver. 2.80 and all seems well -except-
there now appears to be a power output vs. power indicated
difference of about 10W on all bands, including 6M.  

Setting the radio at 100W on the display delivers 110-115
watts output as indicated on two Bird wattmeters that I have
confidence in. There are two Birds involved ... one in the 160-10
antenna #1 output and another in the antenna #2 output.  Both
agree when swapped between the outputs.  Readings were
taken while transmitting CW key-down into a 50 ohm dummy
load.  A second load was substituted for confirmation, BTW.

I've run the TX calibration routine in the K3 utility program
with no change.

I recall reading posts abut this issue recently, but no longer
have them available.

Anyone else observe this difference after loading 2.80?

73! Ken Kopp - K0PP
      [hidden email]
      http://tinyurl.7lm3m5

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[w0mu]

Curious,

I am not running the beta but did the calibration and 5 and 50 watts seem
very close, I have seen that I have to turn up the power knob past the
indicated 100w to actually get 100 watts out.  This is on an array solutions
Powermaster.  I have not tried it with my LP100.  The difference was only
about 5 watts.

Mike W0MU


"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Ken Kopp
Sent: Sunday, February 08, 2009 10:41 PM
To: [hidden email]
Subject: [Elecraft] K3 Output power difference

I recently loaded beta ver. 2.80 and all seems well -except- there now
appears to be a power output vs. power indicated difference of about 10W on
all bands, including 6M.  

Setting the radio at 100W on the display delivers 110-115 watts output as
indicated on two Bird wattmeters that I have confidence in. There are two
Birds involved ... one in the 160-10 antenna #1 output and another in the
antenna #2 output.  Both agree when swapped between the outputs.  Readings
were taken while transmitting CW key-down into a 50 ohm dummy load.  A
second load was substituted for confirmation, BTW.

I've run the TX calibration routine in the K3 utility program with no
change.

I recall reading posts abut this issue recently, but no longer have them
available.

Anyone else observe this difference after loading 2.80?

73! Ken Kopp - K0PP
      [hidden email]
      http://tinyurl.7lm3m5

______________________________________________________________
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