Evan?

? So I have had everything functional for a few days. I managed to get the bias set, spent a good deal of time calibrating the output, which I also have a question about that I will mention further down. No sooner than I was about to put it together and in service, I blew a final. I replaced the 510, and as I was considering what caused the last 510 to die, all went dark. Sitting in steady state receive, I managed to get a short to ground. I have pulled and checked Q9, Q101, and both IRF510s. All checked out, even though one of the 510s began to smoke. With these still removed, I have checked Q22 and Q29, both drains show continuity to ground as well as Q22 having continuity to source. I've been checking paths for shorts/opens, etc.?

?I found that checking the pads for the 510s source, that there is brief continuity to ground, milliseconds, before opening. Is this possibly the string of caps , C104,106,107,110 between the T7 primary and the +12v supply?

?Next question, this last attempt to set the bias resulted in no change when adjusting the pot. Current is ~.9A in receive and bounces around 1-1.3A ptt engaged, no drive, 40m, usb. Removed pot, checked okay. Now, the calibration question. This supposed to be a scale adjustment as I understand, but relative to what? Which signal is being adjusted? Going from the default values, direction and amount of adjustment is very erratic from band to band. Some have had to be be adjusted by a factor of 10. So I am going to clean the board up the best I can and look at it again tomorrow. Since I have quite a few of the components removed, I will leave them until I hear back from you, in case I need to pull anymore.?

?Don't feel to pressed to think about this right away, I know it's mouthful! I'm definitely learning a good deal with this project though, as frustrating as it may be. Thanks again.?