[Elecraft] [K3] KAT3 not functioning on 6m

[w4sc]

Bill

Upgrading to KSYN3A, you should run the High Power TXGAIN  Calibration according to the installation instructions.  Actually, I had to run the WATTMETER,  and BOTH the LP (5W)  and HP (50W) calibrations to “cure” the same issue you are observing.

Installing the KSYN3A in a K3 results in lower output on 6M when the KPA3 is active, i.e. the requested power is greater than 12W. When the power requested is less than 12W, the KPA3 is inactive (bypassed),  the output power is within measuremt accuracy on an external wattmeter to what is requested by the K3 power setting control.

When the power requested is greater than 12 W, i.e. 100W for example,  what I have observed is at 52.000MHz the external wattmeter reads 85W, and at 50.500MHz only 63W is realized.  There is little difference in the output power measured in each case with/without KAT3 tuner “bypassed” or “enabled and matched” at the operating frequency’s outlined above.  

It appears that this anomaly occurs only on 6M,  I don’t know if there is a solution or fix for the above.

K3 F/W  5.67
Load 100W 30Db attenuator
Wattmeter  HP736  with 8481 power sensor  and Bird with appropriate elements. 

Ben W4SC

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