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Re: Startup issue loading Firmware.
#firmware
#troubleshoot
#troubleshooting
#USB-C
I reached out to Jeff through the web interface for this group.?
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He found a few issues with my mid band QMX, a couple of shorts (one of which took out my smps and cpu) and a few other minor issues (we both believe that my buttons might have gotten some Flux in them as they felt gummy to both of us).
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Fortunately he had the tools to replace the cpu because I don't!? He also does great work.?
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With that, I'll likely be a little bit captain obvious:
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Make sure that the QMX is connected to the computer before even plugging in power to the unit.? Then turn it on.? This often resolved new units not connecting.?
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Look very closely for possible solder shorts. I thought I did a good job of this, but the smps and cpu says differently.
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Until you get the new firmware loaded and are ready to start testing the unit in full, use a current limiting power supply and set it to no more than 400 mA.?
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Re: Startup issue loading Firmware.
#firmware
#troubleshoot
#troubleshooting
#USB-C
Hi Bill,
Don't give up! You're almost there! As has been mentioned: make sure you have a good cable. Some are charge-only. That could stymie you right there. Make sure you're providing enough power. If it's not drawing excessive current, give it a little closer to the power you built it for. Building errors are easy to make and common, especially on the QMX mini. These errors often escape builders' notice, even on examination. There are lots of voices willing to share wisdom on this forum if you want to continue your building efforts and finish the job. If at some point you decide you've reached the limit of your own patience, you can find contact info for Jeff Moore W1NC on his QRZ (.com) page. He offers skilled repair in the U.S. for the QRP-Labs line of devices. Feel free to search the forums for ample testimony (including from myself) of his skill and generosity. It's a challenging build, and he provides a gracious back-stop to less-than-expert builders like myself. 73 de Todd W2TEF |
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Re: Startup issue loading Firmware.
#firmware
#troubleshoot
#troubleshooting
#USB-C
Bill...
Have you watched this video ?
It worked for me on my Mac mini.
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Rich, AD0SN |
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Re: Tone or birdie every 500 Hz in USB mode
Mel,
Yours sounds a lot worse than mine does! You can definitely hear a solid tone, though, with or without the GPS. With the GPS there is the on-off code like tone under the other solid tone. My QMX high band does not have either of these tones, but my QMX+ seemed to begin having them after I installed the SSB Beta firmware and started experimenting with the band edges over the course of a couple of hours. I think something in the audio line became more sensitive to interference somehow.?
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73, Dan - W2DLC |
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Solved! I did what Hans says here: /g/QRPLabs/message/141354
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This is 80m calibration looks like now. And I'm sounding great on 80m with PD on!
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73, de BD8BTE
op: Lun Yang |
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Putty
Greetings QMX+ Fans,
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I am having an issue getting the virtual serial portion of the USB interface to work properly.
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Am running 01_01_003 on the QMX+. THANKS HANS, SSB WORKS GREAT!
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From Putty in a WIN 10 environment as Administrator (which i know is working, as I can SSH into another computer on the network).??
All the serial port information matches (as determined from Device Manager), COM port Number, Speed, number bits, etc.
I open Putty, get the terminal screen and type FA, nothing happens. No matter what i type nothing happens. See attached.
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I have tried it of several different ports with the same results, no control by PUTTY.? Would really like to get this working to do the sweeps, etc.
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I am quite certain the connection to the QMX+ is working properly as when it is powered down the COM device is removed from the manager, and the sound card is working and can be operated from WSJT-X.
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I also cannot get the CAT control to work, tried RIG as Kenwood TS440, and QMX+ in the new HAMLIB. No Joy.
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Am i missing something?
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Any help appreciated.
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Kind Regards,
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George DU9GT |
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Re: V6 Sythesiser PCB link wire
Hello Bruce It was a PCB error. My fault not the manufacturing. We had to fix the 500 boards of that batch by soldering on the little wire to make the connection.? 73 Hans G0UPL On Wed, Apr 2, 2025, 09:52 Bruce Akhurst via <bruce=[email protected]> wrote:
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V6 Sythesiser PCB link wire
One for Hans …?
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Used the latest V6 SMD version yesterday
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Less to do and makes wiggling the synth in and out of a U3S stack much easier?
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Curiosity. ?A super- tiny link wire, hand -added between the 2 FETs (3.3V?) seems to duplicate existing tracks. ?Was the Via omitted??
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Re: Low current BIAS SMPS
Yes you’re right. It’s a typo. I meant Q501. I was checking the schematic to check where to look for a fault on the board. I realized that there might be an inconsistency between schematic and silkscreen. I couldn’t find Q516 (from the schematic)on the board. I think it’s labeled there as Q12. Just for now I took the mosfet from ptt for Q501.
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Jason
Todd W2TEF
rsmith
Daniel Conklin
George
Bruce Akhurst