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One of my bnc adapters to my dummy load recently failed,? too, and was very flaky.? Not an uncommon problem. For the power output, do LPF scans and see how they are responding.? The efficiency of

Jim: Excellent work and yes, surgery went well but there will be some rehab involved - I’m really sore right now. Right now, I can’t get up the stairs where the shack/bench is located. But,

I rewound T507 and got pretty much the same results, until I checked the BNC connector on my dummy load, and discovered it had been damaged and wasn't giving a consistent connection.? I pulled out my

Hi All, I have a plan to build a QDX-M for 80 metre FSQ activities. The QDX-M appears to be ideal for this with it's clever non SSB method of producing the tones required. However, the web page shop

Stan and Ludwig: 1)? Some conflicting information to clarify/resolve: in one place you say "ADC_3V3 measures 6.6V" and another you say you measure 3.3V at ADC_3V3 (which corresponds with the 6.6V

Thanks for sharing these details, John! How clumsy is it to operate via a phone screen? Workable for a POTA/SOTA event? -Nate N8BTR

I did not go mobile, but rather made a recording of the audio on my ICOM transceiver. These were my final settings after trying various settings on my QMX with the Heil Pro 7 (IC)headset. I worked a

I just used an inexpensive MAX9814 Arduino mic amplifier module, which I also happen to have in my junk box. Cheers. Mel. M0KMD.

I wouldn't describe a K of 5 as good. A figure of 1 or 2 is much better. The lower bands eg 40m may be very difficult to use at a K of 5. Digital will stand the best chance of getting through on these

Probably time to inspect the connections you made closely for stray solder and/or lifted track

Very good Mel! I think a mic preamp perhaps on a daughter board with special consideration to low noise components, good equalization, layout and filters, and a low impedance output to feed the QMX

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