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Thanks again Ludwig, The Voltage at the Drain Q101 (Gate Q102) is 9.7v, the voltage at Gate Q101 is 2.6v, source Q101 is 0V and the voltage at Source Q102 is nearly 12v and at Drain Q102 is 0V (With

Check out the channel today. Looks like Hans has some serious competition. https://www.youtube.com/watch?v=1pERdo3uUos&t=12s

Braden, but you may see exactely this. Please read Operating manual section 5.16 Display/controls menu. And if you are in over voltage protection the displayed value is blinking. 73 Ludwig

To be right, there was an error in my previous post. If the controller doesn't work the gate of Q101 is pulled to (or near) the voltage at "+12V", not only 50 %. 73 Ludwig

Stan, turns out it was the voltage protection. So, thank you. I sure wish the voltage readout on the radio had one more digit to show voltage to tenths of a voltage, as other QRP rigs do. I've heard

Azgael, if not alredy done please remove the black wire. At least from 2 V up at gate of Q101 the voltage at drain should be near 0 V. You see 2.6 V at the gate, enough. Please check voltage at drain

Dear Stan Now makes more sense this all thing. Basically I do have continuity between the drain of Q102 and In of IC101, NO ISSUE on the Via as you and Ludwig mentioned. Further debugging, I measure

Thanks, Allision, for the definitive answer here. I've been using a buck converter to run my QMX off a 12V battery. I was hoping to come up with a ~9V LiFePO4 battery so that I can remove the buck

So tonight I did a reset and calibration and the problem is gone. It was actually gone after performing the reset and a power cycle. Interesting thought on the power possibility. I was running it on a

Something like that happened to me when my battery got close to the end. Seems that at the initial key down there’s a power drain beyond my limits. Changing batteries fixed the problem. I was

Has anyone else seen an issue where the receive audio stays on during transmit? I noticed it today. It happened on all bands and when I key the mic the receiver audio doesn’t blank. It’s not

Check that the tab on the display is bent over and not shorting the capacitor on the PCB. ?I went round and round on this symptom until I found it. ?You will have to carefully remove the display

Thanks Muhsin

It's all good. The height of the cycle. In a few years we will need a few more watts!

I had something similar.? Turned out to be the battery charger in next-doors RV.

Pierre, good plan to mount the IC’s on sockets . I did so on my QCX kits. Worked out great. Enjoy the build. Gary

Can anyone recognise qrm in attached picture? Signals are spaced around 40khz. It shows up randomly, no specific time patern so its hard to pinpoint the source.

Stan,? Yes, I'm sure about that. After I read reports of that I checked for tones and birdies. I found a few birdies here and there, but not these tones. They also were not there at first with the

If you recently used the QMX+ system menu to switch from USB to LSB, that could be the problem.? If you did, and it is set back to USB, try setting it to LSB again, exiting the menus, then go back in

Mike and Gary, Thanks for your comments. Building and then repairing the QDX was the most I could do. I'm using a soldering station set to 750°F with a very fine tip. I've carefully studied the QCX+