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Hi all I updated the SSB beta testing webpage of the brave, here: https://qrp-labs.com/qmxp/ssbbeta.html and released firmware version 1_01_003 to it. These are the changes: Bug fix: Initial value for noise gate samples was 100 (should be max 99) - makes no real difference but it needed to be fixed Added TX indication underlining the A character when transmitting from USB sound card in SSB mode. Note that the two possible states for this indication are a single dot (indicating PTT has been applied and now the radio is in TX mode) and the solid bar (indicating audio is being received from the PC and transmitted). There is no double-dot like there is in Digi mode indicating insufficient volume, because in SSB mode the radio transmits whatever you give it, even if the volume is low. Bug fix: CAT command TQ1; did not cause transmit when in SSB mode. Now TQ1; and TQ0; work properly in SSB mode. Bug fix: Prevent button presses from accidentally activating VOX, which was happening due to sound picked up from the internal (cancellation reference channel) microphone when you pressed buttons right next to it, and that prevented band change because the second click of the double click was ignored because by then the radio was in transmit mode. All fixed! Now you can click buttons however you like and when button clicks are done, VOX is temporarily disabled until your button pushing frenzy is over. Power meter now reads Peak Envelope Power (PEP) when in SSB mode. Previously it was just reading a sampled value (NOT an average); so if the power meter was updated 10x a second, the updates would just randomly pick a value from the SSB amplitude envelope, which was most unlikely to be its peak value. Bug fixL Calibration hung at DAC 1300 when run on LCD. Now the calibration completes properly when run from the LCD. Many thanks for all the feedback so far, SSB in QMX is getting better and better! 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

This type of request needs to be submitted to the support desk at qrp-labs, not this user-supported forum. Stan KC7XE

Will USA tariff laws affect the import pricing of Hans’ great radios/kits into the USA?

Ok,,,, just for fun I thought I would try my QMX+ with my KXPA100 amp and *it works great*... puts out about 50 watts with QMX+ driving it. I made my first SSB contact in QRP mode on 20m the other day but since the bands are not that great and I have this amp normally hooked up to my KX3 I thought I would see how hard it was to get working... EASY.. just set the PTT on each band to "grounded" and I have a TRS-to-RCA breakout cable (not sure I have that but...) once I figured out which RCA plug was which, I just plugged it into the KXPA100 and bingo! Plus since the KXPA100 has an ATU built in I can use that as my tuner ! Pretty cool...just wanted to toss that out there in case anybody else was thinking "QRO".... Of course.. NOT a cost-effective solution...;-) Mark

The wiki page QMX QMX_plus debugging environment has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions

Hi All, My mid band QMX Rev.2 developed display problem after 4-5 months of good working. Firmware 1_000_027 I build 12V version. After switching on all seems ok and works, but after 20-30sec display becomes corrupted. Initially it is just a few letters but soon after that all text is corrupted and gibberish. When I switch off and on top row is just black boxes. If I leave radio switched off and detached from battery for day or so and switch it on problem repeats itself again. I mean first it works and then display problems start. I done this couple of times now and each time Initially it works and then after display stops to play a game. Connecting to computer through USB works and all diagnostics and LPF/SWR/etc... tests do not show anything unusual. Any ideas what's going on? I am not that knowledgeable to sort it out myself. Can you direct me what else I should check? --------------------------------- 73 de Marek SP9TKW

Hello i have received my assembled QMX+ a few days ago and go the power cabled assembled feeding this unit with 11.80v of dc. (12v model) I can putty into it and see the hardware tests pass, the data sheet shows all good on all bands. It powers up and down fine. I have not xmited w it yet. I can viewed the manual that i downloaded and printed out for vx.0027 of my software Still not sure of how to operate it. When i turned on practice mode or keyed i get a continuous series of dahs all the time. Even with key and cable disconnected. ???? If i put the unit in vfo mode it seems to go away. Volume., are and band changes seem ok. I got thsi to stop but not sure how?? on any band cw i get a continuous audio chuffing sound like its sampling or some such. I can use some help or guidance on this and i am not transmitiing until i get this sorted out. Can i or did i change a settting in the config when i puttyed in? Maybe its my ignorance of how it operates?? Thanks in advance Charlie k2cmc -- Charlie C. - K2CMC LICW/SKCC/NAQCC

Just about to finish my QMX+ build and I have a voltage question. The kit was built for 12 volts. I have a 100 amp/hour lithium iron battery for vhf base station emmcom backup. At full charge, its just north of 14 volts. Would it be wise to install a buck converter in the battery box to limit voltage out to 12 volts for the QMX+? Thanks in advance - I really don't want to fry this little gem. -- Jim, W7EZN 73!

Is the QMX itself in any way capable to negotiate the required voltage with the power bank PD? In other words is a 12V trigger cable required or not? I feel more comfy with a trigger cable as it steers away from any negotiating. 73 es dx

In the QMX+ does the polarity of the 10-turn windings on T507 (part of the Fwd/Ref power detector) matter? In the assembly manual the photo looks like they're wound to be mirror images of each other. I wound mine so the turns advance clockwise on both sides. Will this cause a problem with RF power measurement? Or worse yet, cause a serious impedance mismatch for the lowpass filters and finals?

Id like to thank everyone that took the time to answer my question regarding the QRP Guys mic. Larry NA0F

The QMX mid-bander (60m thru 15m) is one of my primary radios for portable QRP operations for nearly a year now. The “problem” is that it puts out too much power in CW mode. Here are the numbers using a fully charged 12v battery into a 50 Ohm dummy load measured with an external watt meter: 60m - 6.1W 40m - 5.3W 30m - 5.1W 20m - 5.6W 17m - 4.5W 15m - 6.5W QMX Firmware is 1.00.026 Question; with the amplitude modulation capability that exists to provide SSB, can the CW mode be enhanced with per band configurations that enable trimming the power down to 5.0W for “by-the-book” QRP and to also lessen any risk to the hardware resulting from power levels that exceed 5 watts. I can also see a use case for an easily accessible CW power level “knob” for running QRPp without fiddling with the supply voltage. 72, Matt

I have two questions. I purchased a mic kit from QRP Guys. If I understand the QMX & QRP Guys instructions the jumper should go straight for the QMX’s not the cross on the PCB board. Second has anyone found a wind screen for this mic barrel. I have not had any luck at all. They are either much to large or small. TIA Larry NA0F

Hello, I just completed a QMX build and had a power-up issue. I used a lab PSU at 7V initially; QMX draws ~150 mA right away - not proper. But at the same it did power-up and display lights up. So I tried USB connection and was able to flash the firmware successfully. - it self-turns on; - MCU probably thinks it is underpowered: as soon as it boots and displays normal view, it shows "Shut down!" and cycles; - display backlight blinks randomly - again, power stability issue? - draws too much power: I dared to try to turn it on with 9V and got almost 1A consumption. I double-checked all components, especially on power boards and found no fried parts or soldering issues. I also checked the 8-pin power board connector; it is the only board getting the incoming voltage, is this correct? I don't see constant grounding on PWR_ON pin (unless left knob is pressed). There's no measurable impedance between power and ground on the power connector if the power board is removed. I also checked for notorious Q103/Q104 short before building - not a known V4 problem, but just in case. What else I can check? I assume the problem is within 8-pin power board; could it be somewhere else? Thank you in advance.

Assembled my QMX+ and it's working. I had a couple of issues related to enameled wire not making good connections that were resolved. I know it's working, I've made contacts on several bands successfully, including some decent DX, all on FT8. What bothers me is that the output power seems to jump around wildly. If I go to the diagnostics screen and key the transmitter, the Bias SMPS shows fluctuations in current that correspond to the fluctuations in the output power. The Duty cycle on the Bias SMPS always shows 0%, even as the current jumps around in the red. I suspect I've managed to damage one (or more) of the surface mount semiconductors. At least that's what my reading on the subject would seem to suggest. What I need is a test that can be done with a multi-meter that would shed some light on the problem. I can probably resurrect an oscilloscope if I need it, but I'm hoping someone can lead me to a simple voltage or resistance test that could help isolate the problem. My last problem was related to soldering and enameled wire which was easily resolved. I'm hoping this issue can be resolved without major surgery as well. Thanks in advance for all of the good advice I'm about to receive. Andy WB9YXA

Hi all, I've just finished building a QCX Mini (Rev 3; software version 1.09a; 30-meter version). When I powered it up for the first time, I got the intro screen followed by a 160-meter frequency. Having read the advice to do a factory reset if I didn't get a band select screen, I attempted to do that, and that's when my problems began. First, going to option 7 (other) and then heading for option 17, I found that the menu options stopped at around 9. Then, once I tried to move past that point, the display either went blank (still fully lit but no info) or started producing gibberish. After cycling the power several times (and waiting 30 seconds or longer before powering up again) trying to "get lucky," the display now goes to gibberish after option 4 or 5 on the main menu. Any thoughts on what the issue might be and/or how to try to resolve it? Many thanks in advance. 73, Rich, W2VU