SWR qsx reboots #antenna

hanz PA3ZZ
 

OM's
Just build the qsx 40meters.
RX is perfect
TX perfect on a dummload.
When i connect my antenna, swr 1:1.38, measured with rigexpert and a press the paddle or key the qcx restarts.
Connecting a dummy load,all fine, output 3 watts by 12 volt.

Anny ideas

tnx 73 hanz yl3jd

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