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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

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

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

no band change

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?

Hello, I am getting ready to build my QMX and want to do so in the 9v configuration. Question is the manual says it runs at 9v or "a little over", so the question is. Will the radio be happy and safe to operate with a Bioenno 9v battery. Their website says the battery is regulated to discharge "around 9.6v" Anyone have any experience with using this configuration of Bioenno 9v and the QMX? If so how is it working for you? Thank and 73's W7YWF. (Mike)

I have an odd situation here with my 12V QMX+. I could transmit normally on all bands with a 9V power supply. But at 12V when I transmitted on 12m (24.910 MHz) the current draw was quite a bit higher than on the other bands. My power supply's current limit was set at 1.0A and it hit that. All other bands drew less than an amp. After transmitting at that frequency the receive current had jumped to 300 mA (previously about 100 mA) and all the other bands transmitted about half the output power they had before. I replaced the finals and it happened again. Transmitting on 12m at 12V caused a failure in the finals. (Possibly Q507 as well. I get no RF output at all on any band now.) Any ideas on what might cause that one band to zap the finals? I've looked over its lowpass filter and don't see any visible shorts, and the inductors have the correct cores and number of turns. I was able to transmit on 10m before trying 12m and it seemed to work, although with less power out than the other bands.

Hello, I recently build QMX+ and noticed a huge noise floor and wistling a 6 m. Therfore I measured sensitifity using a signal generator. Band [MHz] Sens [dBm]@Noise+10dB Noise [dB] 1,85 -100,0 0 3,65 -106,0 0 5,35 -107,0 6 7,07 -107,0 0 10,14 -110,0 2 14,23 -107,0 1 18,1 -103,0 4 21,04 -99,0 9 24,9 -97,0 7 28,1 -103,0 5 50,5 -79,0 20 Method: injection of signal Rx frequency + 1,1 kHz Mode: Digi Noise: signal detected by WSJT-X Sens: Noise floor + 10 dB Noise floor is increasing by frequency, but at 6 m wistling and digital noise make RX unusable. Output at 6m is about 2 W at 9V Vbat (12V Version) 1,5 kHz wistle starts at 20 m and is increasing by frequency Using wsjt-X i evalating waterfall diagram: (QMX+ at 50 Ohm) AVE:1, cumulative Noise [dB] : signal by WSJT-X signal in waterfall diagram AU QMX+ freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] Frequency [MHz] Noise [db] Noisefloor 500 1000 1500 2000 2500 3000 1,84 0 0,2 0,2 0,2 0,8 0,2 0,2 0,2 3,57 0 0,3 0,3 0,3 0,7 0,3 0,3 0,3 5,3 1 0,5 0,5 0,5 1 0,5 0,5 0,5 7,04 5 0,8 0,8 0,8 1,1 0,8 0,8 0,8 10,1 1 0,5 0,5 0,5 0,5 0,5 0,5 0,5 14,1 1 0,5 0,5 1,3 2,8 2,1 0,5 1,5 18,1 5 0,8 1 1,8 2,3 2,1 1,1 2 21,1 7 1 1 2,1 2,6 2,1 1,1 2,1 24,9 7 1 1,2 2,7 2,8 2,7 1,3 2,5 28,1 7 1 1,2 2 1,5 1,5 1,2 2,2 50,3 22 1,8 2,5 3,8 4,2 3,9 2,8 3,8 At higher bands 1,5kHz signal is constant and independent from RX freuqency. At 6m additional audio signals are appearing. 6m RF Filter seems to be ok. Any suggestions to detect cause? vy 73 Michael (DF6TV)

After initial hickups after assembly, i deployed my QMX+ as base/main rig. 3 months have passed making QSOs with it and the following is the statistic, all FT8 Worked QSO: 1004 Worked DXCC: 86 CQ Zones: 20 ITU Zones:27 Continents:5 Longest contact: Fiji 16231km Other than that i made contacts with few Australia 15400km and New Caledonia 15900km away from my QTH All results on 20M with 3.2W and under the roof dipole. Overall very happy with how this rig performs, nothing can beat the price range vs performance it provides. Bad weather here is over, time to deploy some new antennas for this bad boy, and improve the statistics :)

The QMX Rev. 1 that I had assembled some time ago recently stopped working after making many CW and SSB contacts with the beta SSB firmware. By-the-way, the calibration went nicely. No issues there. It would turn on with no display but wouldn't turn off. Certain the CPU was dead, I was contemplating chucking it in the spare parts box and just continuing on with my QMX+. However, I decided to send it to Jeff to see if he could salvage it, and I'm glad I did. Jeff discovered the CPU wasn't dead and was able to get it working again in perfect order. His turnaround time and explanation of findings was great. If your QMX goes down I highly recommend Jeff to get it working great again. If it's beyond your repair capability, he's got the experience, tools, test equipment, parts and talent to make it happen. Thanks again Jeff. 72, Randy NR5N

I just updated to the new SSB firmware on QMX+ Rev. 3 and was hoping to try out MSK144 mode in WSJT-X. (Probably not enough power to be heard by anyone, but still.) I have found the PTT over CAT control to be inconsistent when in USB mode. Usually the first TX works and then the rest briefly trigger then un-trigger PTT. (DIGI mode still works just great.) Looking at the CAT monitor doesn't show anything odd (no early RX; sent) and it's not triggering SWR protection or anything. PTT over CAT in USB mode in fldigi---also using Hamlib, same Kenwood TS-480 config---works fine. As far as I can tell, the only difference is that WSJT-X is sending either 'TX;' or 'TX1;' depending on the configuration; while fldigi is sending 'TX0;' which for some reason is more reliable in convincing the QMX+ to transmit. Is anyone else having this issue? Any suggestions or ways to convince WSJT-X to send 'TX0;' instead? TNX 73 de Tim AF0CQ

Hi all, I completed my QMX build, and it won't power on. I took my time and was very meticulous. Or so I thought. When I power it on with the left encoder, nothing happens but I notice that IC101 gets slowly warm then hot if I don't pull the power. I can have the power connected but IC101 doesn't get warm until I press the left encoder. I can also connect it to my laptop and see it, but I don't dare leave the power connected for long. Has anyone seen this or have recommendations on where to start troubleshooting? Many thanks Aaron

Hi all, I built my Rev 1 QMX kit a while back and got bitten by the shorted diode on the SMPS board. After fixing that, the QMX works very well. However, in the hardware diagnostics screen the PIN diode bias current is all over the place. If I put the rig into transmit with the dummy load the current goes from about 17mA to about 70mA and everywhere in between. Any idea if this is an issue and where I should start looking? TIA. Jason