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New QMX Build
2
Just finished my QMX Midband V4 build. I built it for 12 volts. The audio and RF sweeps are almost exactly as in the manual. Battery was at 11.2V Power from diagnostics as follows: 60 meter 5.3w 40 meter 4.3w 30 meter 4.3w 20 meter 4.2w 17 meter 3.8w 15 meter 4.9w I was using my QRPoMeter as the dummy load. Am I at risk if I run it at 12v. My pack is 3 cell Liion 5000mah (12.6 charged) with inline diode to bring it back to 12.0v. Thanks John KY4WW
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qmx+
5
i had a short between the two left front of jp110 i can't wait to see output of tx on a spectrum analzer im 84 this year an so be cool.
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QMX+ Morreitized
Big thank you to Jeff Moore. Fixed and set up my QMX Plus. Works great. Super-fast service. He's a tribute to the ham radio community. You're the best. Gary W0CKI -- Gary W0CKI
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Onboard mic timeline?
4
Hey all! I¡¯m not saying it would be an ideal situation or anything, but does anyone know if/when we will be able to use the onboard mic for ssb operations? I really love the portable nature of my kit and don¡¯t mind using the onboard mic. Thanks! 73 Jeff KB3TVP
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QCX-mini LCD backlight not coming on
10
Just completed troubleshooting a couple of items on the QMX-mini build and the unit now up and appears in good shape except the backlight doesn't turn on. I've rotated the LCD pot all the way which changes character brightness but without the backlight illuminating. I have the backlight set to 'on' in the menu system. Is these somewhere obvious I can trace the issue ? I imagine the signal from the processor to the LCD to turn on the backlight is not getting through but I'm not sure where to start looking, which pin on the LCD is connected to which pin on the processor (IC2). Any help is appreciated.
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Hi, I recently finished building my qmx and after checking for shorts and not finding any I plugged it in but it draws too much current (200mA when applying 7V (which drop to 3.7V)). I can connect to the device via the serial console where it outputs the following data: Supply Voltage: 3.7 V 5V SMPS Status: Error Voltage: 3.34 V Duty max: 85 % Duty cycle: 85 % The 3V3 SMPS is working fine. When testing the 5V SMPS board it seemed to work. Any ideas where I should start looking? Cheers Lieven DF1CN
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qmx+
I sorry you mistook question I'm looking for 12volt input mine is burnd out do my error.
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qmx+
can you tell me connections to front panel on qmx+ I doun't have +12volts
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Updated Wiki Page: Home
#wiki-notice
The wiki page Home has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions
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Updated Wiki Page: QMX QMX_plus Debugging
#wiki-notice
The wiki page QMX QMX_plus Debugging has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions
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QMX 40-10?
5
Is it possible to build a QMX that would cover 40, 30, 20, 17, 15, 12 & 10? I¡¯d much prefer that instead of 60-15. Don W6CZ
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Wanted to give a heads up - I haven't seen this battery in stock for a bit and I think it is a perfect match for the QMX. I thought they were discontinued... It's the Turnigy 9xR 3S LiPo cell, very small (approximately a stick of gum sized, a little larger), and it has a protection PCB built in to prevent over discharge or over current. 2.2AH of capacity, 3.3A max continuous current, 12.6v fully charged Can't argue with the price either at under $10 https://hobbyking.com/en_us/turnigy-9xr-safety-protected-2200mah-3s-1-5c-transmitter-pack.html
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Hermes Light 2 vs. QMX+
12
Hello. While I await my QMX+ to arrive so I can experiment, I joined this Group and searched for a few topics that come to mind, but did not find much information. The users here are very knowledgeable about the QMX+ and I am hoping others will provide some insight to these questions. Thank you all in advance: 1. Can the QMX+ be controlled by Thetis? 2. If yes to question 1, do "Radio Model" profiles for the QMX+ exist in Thetis? I only see Hermes and ANAN profiles. 3. Will the developer kit allow the addition of an Ethernet connection? 4. If yes to question 3, will it also allow PoE? 5. Could the QMX+ be powered by USB-C? 6. Could WiFi be added to the QMX+? 7. Can the QMX+ be operated remotely over the Internet? 8. Can a USB microphone connected to the PC be used with the QMX+? 9. It appears that the QMX+ makes use of some form of pre-distortion. Can this be used with an external amplifier (e.g., Mercury Lux)? The Hermes Lite 2 has an additional SMA connector for Pure Signal. I don't see one on the QMX+. 10. Any heat concerns with high-duty cycle modes (e.g., FT8)? The Hermes Lite has a heat sink shim that dissipates heat via the enclosure. I did not see anything like that for the QMX+. I really like my Hermes Lite/Hermes Lite 2+ but appreciate the wider band coverage and some of the intelligent engineering present in the QMX+. I look forward to experimenting, but hopefully others further along in this journey have already sorted out answers to the above questions. Thanks in advance for any replies. 73, Frank - KG9M
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USB audio level boost QMX+
5
I don¡¯t know if anyone else has experienced this, but I was checking out FT8 on 10M and the audio levels were in the red -too low, with no decodes, despite seeing faint signals on the waterfall. I¡¯m using a Surface Go tablet with Windows 11 Pro. I¡¯ve checked the recording control in Windows and it is maxed at 100%. I¡¯m using digi mode and usb audio from the QMX+ plenty of level and good decodes on the lower bands Nick G0OQK
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Just updated firmware to SSB. on my QMX +, and am waiting a bit on the QMX. My ancient Icom HM 125 ( rewired) worked for a few minutes and quit. I had expected that the official release would enable use of the internal mike?? disappointed. These mikes seem quite inexpensive SO ---- Can anyone recommend a plug in ready to go mic from Amazon USA. Hopefully a product which has actually been tried and works decently with good sensitivity. Yes,I am lazy and impatient (been waiting for SSB for over a year )and also 82. and a bit of a rant I'm also biased against manufacturers who cannot be bothered to have their websites work with safari - the qrp dudes want me to use firefox or whatever. If they don't have the competency to work this out, what about the product( mic) they are trying to sell me?
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QMX+ Case - Screws
3
#QMXplus
Can anyone kindly inform about the M3 black screws used in the QMX+ case ? what'is lenght ? 6 mm 8 mm ? This afternoon after assembly and performed all tests i was presented with 8 black screws that dit not fit, they are M2.5. In the assembly manual is stated they are M3 but no info about lenght. Ahh, by the way the QMX+ worked first power on but with a garbled screen. Had to disassembly the front panel and retouch the LCD pins. Its a big PITA to properly solder them by the manual. Now everything is ok. Greetings //Eduardo
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Gotta replace the PAs. To socket them, good or bad? See numrous sockets on ebay and online, but which to order, oh me oh my, what spacing or whatever. What do you say? -- 73 ChuckR
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Ultimate 3S Issue
3
It has been a while since I've used my Ultimate 3S for WSPR and it has worked flawlessly in the past. However now, no signal seems to be transmitting and the oscillator calibration with GPS keeps increasing the frequency constantly. It is now up to 27,011,491 and climbing. This can't be right. Any ideas of what the problem may be?
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It¡¯s May, 2025! Time to take your Qrp-lab equipment outside and enjoy the coming summer, assuming you are in the northern hemisphere. If southern hemisphere, then get that last fling in before bad weather sets in.
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Image Name
Sat 8:39am
Sat 8:39am