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The headset has a electret mic. I didn't measure the resistance. It sounded perfectly adequate when I used it on my pc. Hower, the output from the mic seems too low using it with my QMX+. I did try

I'd be interested in a group buy if and when it happens. QRZ is accurate for me. Glenn

Mel, was the gaming headset mic an electret element, or another type like dynamic or crystal elememt? What does its resistance measure? Gaming headsets are known to be poor quality in general. In my

I started having problems with my QMX+ ver 1 after the SSB calibration.? I ended up replacing the BS170s in the final amp which got me back to full power.? However, I noticed that the power was not

I installed FT8CN to an Android phone but found it sometimes transmitted and often did not. Then I discovered there is a magic button on the screen which turns on transmission! It is in the top right

Ok, good new information always helps.? Looks like the processor is indeed able to measure the voltage at ADC_3V3, but I am quite confused about why the processor would be maxing out its 3V duty

Randy, something is strange. Early you wrote VDD is produced by the linear regulator. LIN_REG_EN must show some volts to connect IC101 to "+12V" via Q102. Your schematic shows 0V at LIN_REG_EN.

Kai, I guess Jeff will help. After repair it would be nice to read, what he found. 73 Ludwig

Ludwig, I do not have the ability to use a variable power supply, so I did not test as you wrote earlier. I am going to reach out to Jeff Moore and see if he's willing to help fix it as I do not have

Keith, I don't think you needed to take any turns off L1 or L2. Yes, please watch the video Evan suggests. Hans shows his technique for doing the adjustments without cleaning holes in there as

Thank you Hans for responding. I will try Stan’s solution for now.

the board . . . If you are going to save the part, just clip the leads and unsolder the part one lead at a time. >

Thanks Stan. Let me clarify a couple points. Correction of my statement: At the drain of Q109 is the PWM'd square wave that alternates between 11.9 and 10v. On the other side of the filter at the

If you are worried about series inductance of resistors, best to build a 50 ohm dummy load of all parallel resistors.? ?Not a series combination of two sets of two 50 ohm resistors in

This might need clarification for some: Lifting one end of a resistor or cap or diode can rip the opposite pad off the board. That will ruin your day. Usually easy enough to repair by running a wire

I have to correct. Checking my repair records I found one case with a broken IC403, not clear why broken. 73 Ludwig

Donald, you are right. It#s good to tell this. I'm doing this only for some SMT packages e.g. small diodes (SOD323), small transistors (SOT23) and some tantalum capacitors (yellow). All of these have

Hi Keith, Have you tried any of the suggestions on the QCX troubleshooting page? https://qrp-labs.com/qcx/qcxtrouble There is also a YouTube video by Hans on the

Adding Chris's BAT41 and 0.1uF cap to read the peak voltage with a DVM is a good idea, will work great for a QMX. Han's 20W dummy load does the same, but uses a 1n4004 diode, good for 400 Volts,

Hi Ronald Many thanks for your reply. I have tried adjusting all the low pass filter windings and have taken 0ne turn off each toroid. At first I could only get 1 watt out and after adjusting the