[Elecraft] K3 Hi-power Transmit limiting

[r_zerr]

I began having problems this morning when I went to check into the Elecraft
Net. I had my output set at 100W, and I did not have any output. By turning
it down to around 70 watts, I could transmit.

I went through the transmit gain calibration on 20M and the Wattmeter
calibration, with apparent changes in the Wattmeter reading (initially at
31, now at 79...50W into Dummy load, Bird Wattmeter, 100W slug). The
Transmitter gain changed only slightly, 16 to 17, but is more of a choice
between high-side, or low side of the meter reading. 

Checked and Bat Min setting is at 11.0V and the KXV3 setting is normal

Other info in present condition: 20M >90W kicks off. 20.4A draw at 90W PA
temp=33C Voltage @load=12.4V

I checked the behavior on 17M with similar problems, kicks off above 96W
setting, with 12.8V, 14.3A draw 
15M kick of above 96W, with 12.6V @ 17.8A
12M kicks off above 97W, with 12.8V @ 14.1a
10M kicks off above 97W  with 12.9V @ 13.6A
30m kicks off above 98W with  12.6V @ 16.5A
similar results on 40m and 80m

Before I go pulling the top off and checking connections, does anyone have
any suggestions?


-Ron, WT5RZ


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