My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Q502 gets very hot and its gate-source voltage goes to below -2V
With supply voltage at 9Volt the gate-source voltage of Q502 is -1.4V
I can use the QMX at 9V which is as intended, but something is not right
I have checked for shorts and I cant find any.
In transmit the buck converter works as intended and Q502 stays cool
Any suggestions someone?
73 de SM5EIE / Gunnar
