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Skip I have just found your post and have exactly the same symptoms and almost the same voltages. How did you cure it? 73s Ted M7ECH

Floyd, Yes, everything is fine now. The bias is set. I had picked the wrong pad for "/TX" input. Thanks to all that responded. ken - wa4mnt

SOLVED! The problem was as suggested a short on Q7. The gate lead on Q7 hadn't been snipped close enough to the board and was shorting out with the body of Pot 36. So in the end all that was required

Hi guys, I'm very close to finishing up a U3S Kit with the 5w amp. ?I purchased the QRP Labs aluminum enclosure for this kit. ?The GPS will be in a separate polycarbonate enclosure tethered via a

Thanks Kārlis Unfortunately I don't have an AVR programmer. I have seen other posts about the blank microcontrollers but I feel I should exhaust all other possibilities before disturbing Hans with

Then indeed you could be among the few unfortunate with a blank microcontroller. I had the same issue, and Hans helped me out. If you have an AVR programmer at hand, you can check the FLASH contents

Hi Kārlis My mistake! I dropped a 0, it should have read 120mA Thank you Ted M7ECH

If you populated the QCX completely, 12mA of current draw is very, very low. You should rather see 120mA. Given that there are no switches in the 12V rail supplying opamps, the idle current of those

Ken, Did you finally get it working? correctly?? Floyd

Hi, I had that fault and it turned out to be an un programmed microprocessor. Hans sent me another and all went well. It seems some entered the supply system. Other people have also had the same.

Hi all Recently completed my qcx 40m. On power up, the dreaded depressing single top row of blocks. I have been through all of the troubleshooting hints in 6.3 and every thread I can find. There also

It's rhe wspr receiver at the Georg von Neumayer Resarch Station (GVN)at 70.67 S/8.27W. Which is working great and reports wspr signals from all over the world. My pretty old Ultimate With some 200 mW

Hi Trevor,? No that is what I queried. On that page it says that L2 is made longer than the other two inductors for a lower inductance value, but, all other filters have L2 at a higher value.? I was

Hi. Has anyone replaced the BNC connector with an SMA connector on a QRP dummy load? Just 5 small drill holes. Can it go wrong? 73 Ray ae5hn

Sounds good Ken. And don’t forget to turn the pots back down fully CCW before you start. ?.

Ron, Ah, maybe that's it. I read it as the TX input to the amplifier. They want the control line to go low. I'll try that the first thing in the morning and report. ken

Instructions say to ground the /TX input line. That’s the control line that turns it on. You indicated you grounded the TX input line. If that’s the RF input to the amplifier it’s not the point

There isn't any increase at all, even at full clockwise.

You won’t see a current increase until you reach the gate threshold voltage. That could be something like half the pot range before you start seeing an increase in current. Turn it up slowly and

Gang, Before I smoke something I'd like to get some advice on how to proceed. Today I received and assembled the 10W linear. All parts were included with no extras left over. I check each value before