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10w HF Linear PA current consumption does not change after installation #10W_PA


 

Hello everyone

I ordered and assembled this PA. I followed every step as carefully as I can while assembling.

When the pots closed fully (to counter-clockwise) current consumption is 140mA stable (TX is grounded, no RF) when I apply 12 volts. When I start to turn one of the pots, it is still 140mA stable. Same with the other pot. Nothing is changing. So I cannot adjust them to 125mA (total of 250mA).

I checked transistors (IRF510) and their reading is fine. I cut the power and I touched them first (against static) and checked thier resistance measurement from their legs and their readings are same. They seem OK.

I think I am missing a point. I am newbie about PAs. I send some detailed pictures. Any help would be appreciated.

?

73 TA2CCN

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