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My mid-band QMX (rev 4) is finally back up on its feet and running nicely after a few repairs. I posted a thread a while back with the initial fault(s) and progress with its diagnosis / repair. To

Fault finding by substitution is a risky process in power stages

Hello Eddie, please ready this document ( /g/QRPLabs/wiki/36910 ) from QRP Labs Wiki. 73 Ludwig

Exactly as I found. ACCU keyer built soon after I got my licence, auto character space was not enabled.And with the QMX , I send gibberish with auto character enabled and Iambic A.Very difficult to

Hello Don I'm struggling to reproduce any issues that you stated. Firstly yes, RX out of band must be enabled. Because 15 MHz is out of band. Any attempt to load a 15 MHz frequency preset into the

Try changing from IAMBIC A to IAMBIC B or vice versa. We tend to learn keyer habits very early on in our CW careers and any change in set up can make you send garbage and be unable to understand

Hello Barry https://consumer.steppir.com/shop/controllers-analyzers/optimizir-2-0-controller-package/ Specifically, it's this

How would I fault find the voltage regulator and buck converters on a QMX+ rev2? How would I confirm a dead CPU?

Never mind, looks like the newest QDX guide (I clicked one rev back) has the yellow/blue T37-17. Thank you Shirley for bringing that to my attention. 73 David

Have done much testing but no progress. I checked T401, but found it was installed correctly. I tested filter networks by selecting 1.8 - 50 Mhz and verified the correct torids are being selected, see

I thinkee? Power supply vendor-man he speekee with forked tongue...

The mix of toroid is different than T37-10 listed in the QDX/-M build guides. This is what looks like a T37-6 but has a blue back on it, I do not know what if anything the blue marking changes. I was

Where would I find more info on " The SteppIR controller". Thank you

W6CSN, Thank you so much for taking a crack at diagnosing the issue with both boards—I really appreciate it! To clarify exactly what happened: Kit #1 was originally configured for 12V, but I

Congratulations! If you want to get a USB-PD power bank to deliver EXACTLY 12V, you need a trigger cable. Adafruit sells them fairly inexpensively (that's where I got mine). Most modern Anker power

No just a 20 meter antenna. In band ham frequencies can be saved, no problem.

So, As time allows, I've been inspecting the board with a digital microscope -- much better than what I was using before, which was a cheap magnifier on an equally cheap soldering stand I got before I

T507 rewound, this time soldered from the top. Now rig indicates that it is putting out full power -- Daniel ZL2DTL/ZL4YOTA

Hey, all! I finally received my QMX+, that I ordered back in, I think, May. Why so long? It's perfectly reasonable -- I ordered it pre-assembled. I'm having to do that most of the time now, as I

Sounds like maybe you have a USBcable connected, and FT8 running?? 73 Roger 8P6RX ?Get BlueMail for Android ?