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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

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_004 to it. I did not solve problems with SSB phase distortion calibration, but I added a couple of additional failsafes. I am inclined to stop calling it beta. But I welcome your opinions on this. I know there is more to do, there will always be more to do... I think I would be more comfortable calling it the official version and moving onward. Having it all properly documented in the operating manual and all in one place would simplify things and reduce confusion. What do you think? These are the changes: Bug fix: Incorrect PA voltage display on the Diagnostics screen due to 57 / 10 being rounded to 5, as discussed in this forum. Change TX color in the diagnostics screen from red to blue, to avoid confusion since red things are errors. Added two more USB Virtual COM serial ports. QMX now presents itself as a USB hub with a 24-bit stereo 48ksps USB sound card and three USB Virtual COM serial ports attached. The advantage of this is that you can be running WSJT-X connected to a serial port, then run a terminal emulator connected to a different serial port; then you can make adjustments to the gain for example, to get the WSJT-X SNR meter at your desired level. You can also use other tools like "Input analysis" in the "PC and CAT" menu, which displays incoming audio tones from the PC; previously this could not be used unless you used VOX for Tx/Rx control. The CAT monitor can also be useful to be able to monitor incoming CAT commands and responses in realtime on one port, with CAT running on another. And going forward, for developers who wish to experiment with BASIC scripting, it will also be important to have multiple serial COM ports. Added CAT LC; command to retrieve LCD contents: it returns a 32-character string, whose contents are whatever is on the LCD at that instant. Any custom characters are replaced by spaces. The only exception to this is the VFO indicator which is replaced by an 'A' or 'B' character. Added CAT commands SA; which returns the AGC dB value (dB of attenuation applied by the AGC system). Added CAT command SM; which returns the S-meter value. This value is in dB. To convert to S-units, divide by 6. Added CAT command PC; which returns the power level during TX. The value is in tenths of a Watt. For example response PC45; would mean 4.5W. Added CAT command SW; which returns the SWR meter reading during TX. The value is in units of hundredths. For example response SW142; would mean the SWR measured is 1.42. Added CAT command SS to get/set SSB input source. Valid values are 0 (USB from PC), 1 (Two-tone test generator) or 2 (External microphone). I migrated AF, RF, Image, LPF and Test ADC I/Q terminal tools to the standard ASCII-art graphing tool I developed. Previously every tool had its own piece of code, which of course were copy-and-pasted from each other and largely similar. The advantage is also that the standard ASCII-art graphing tool I developed, also has an interface to display a miniature version of the graphs on a 20 x 16-pixel canvas, shown in a 4 x 2 character section at the right-hand side of the LCD. This means all these sweep tools are now also available on the LCD and buttons, without needing to use the terminal emulator to see them. They are all under the "Hardware tests" menu. I created a new tool called "PA mod. test" specifically to check the operation of amplitude modulator. This is under the "Hardware tests" menu both on the terminal interface and the LCD user interface. Attached is an example of a correctly functioning amplitude modulator. The x-axis shows the DAC value, the y-axis shows the measured PA voltage. A correct result is a straight line that goes (almost) from zero to (almost) the QMX supply voltage; a 12V unit will saturate at about a DAC value of around 2500 as shown. The Hardware tests / Diagnostics screen is now also available on the LCD interface. Here there are 6 screens, which you scroll between by using the Tune knob. You i

My newest QMX+ kit Rev 3 arrived and was assembled exactly one week after ordering! The diagnostics test page showed output power (0W) and SWR (random values). Everything else was OK. All sweep tests showed strange results. Yes, the dummy load was in place. So I decided to power off and check all solder joints again. The QMX was on the table without the enclosure and I did not get a good grip on it. As I pressed the Vol button for power-off the QMX moved on the table and the long button press was interrupted, giving *two* long presses like keying Morse M. The display flashed abnormally showing some text and dimmed. All happened so quickly that I did not see exactly what happened. No smoke, no hot components. Now I can not power-on as the radio does not react to any button press. Nothing happens. If jumpered for forced firmware update, no flash drive appears on the PC. This could be a firmware problem. Is it possible that the second long press of the Vol button started the power-on cycle while still powering off and writing data to the flash memory? Clearly, while performing power-off and saving data into the flash memory, the firmware should ignore the button press for power-on. -- 73 Matti OH6BEX

Hello! I am trying to find right settings to start work with WinLink and VARA HF threw QMX. CAT connection is OK. The only problem here is that when I choose some Gateway channel QMX always switches to USB mode from DiGi. But it is not a big deal to return back to DiGi manually. The main problem is that when I start connection with the chosen channel QMX shows two dots as TX status. Which means that audio level from PC is too low. But I've put it to maximum. And everything works fine with WSJT-X and JS8Call. So problem is definitely with some WinLink VARA HF settings? Can smb help? Hans, did you try to use WinLink with QMX?

I installed FT8CN to an Android phone but found it sometimes transmitted and often did not. Then I discovered there is a magic button on the screen which turns on transmission! It is in the top right of the Calling screen and looks like a loudspeaker. You need to click on this until it turns red as shown on the screen shot. I also discovered by repeatedly clicking this button it changes the "Sequential" setting between 0 and 1 which changes whether it transmits in the first or second time slot. I have read the English manual but don't remember seeing these controls. The settings are QDX rig selected which works with my QMX and CAT control. Everything else is default. Phone is a Google Pixel 9a.

On 4/21/25 I had a CW practice / rag chew session on 20 meters. I worked no stations: Conditions were OK. SSN = 108, SFI = 156, A = 14, K = 5. I heard several very weak stations calling but they were too weak to work. My next CW practice session will be April 23 at 16:00 EDT / 20:00 UTC on 20 meters. Anyone and everyone is welcome. This practice is intended for operators who are new to CW or they need some practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists are OK. Slow speed is OK. Really slow speed is OK. This practice is meant for you to improve your CW. I will do my best to adjust to your skill level. Operate at any power level. If several stations show up, I will operate as a round-table control station. I will do it as a round-table so everyone gets a chance to transmit. Please listen to my directions. Details: Date - April 23 2025 Time - 16:00 EDT 20:00 UTC Band - 20 Meters How to find me - I will find a clear frequency and call CQ. Go to the Reverse Beacon Network and search for my call sign AB8DF. That will tell you what frequency I am on. Tune your station to that frequency and if you hear me give me a call. If there is a QSO in progress, please wait for a break in the action. Then send your callsign. If I hear you, I will invite you to join the QSO and start a round-table QSO. Reply to this email if you have questions. IT DOES NOT MATTER HOW POOR CW IS Ed AB8DF

I finished assembling my QMX+ (including a battery mod) and finally got the chance to test it. In the diagnostics everything appears to check out, until I press P. At that point the SMPS bias current for every band is ~4.6mA (where the PIN forward bias is 30mA). If I press T (while connected to a dummy load), the RF output and the Transmitter Voltage turn RED, with the Voltage reporting ~9.5-10.0V. Power is consistently listed as 0.0W, and the SWR (into the 50 Ohm dummy load) is all over the map. Any ideas what I did wrong? I've looked at all of my soldering connections multiple times and don't see any bad joints or bridges. I've checked everywhere I can think of for continuity, and everything has checked out so far.

Hello, I recently just fished putting my QMX Rev 4 kit together with the windings necessary for 12v input. As I was going along I verified I all continuity checks as instructed and verified no pads were bridged. Upon attempting to power on the device, I connected my 12v power supply to the barrel connector. The screen immediately lit up and I had black rectangles across the top half of the screen. A second or two later I started seeing smoke, heard a pop, and the screen went dark. Upon further inspection, I was able to discern that the Q108 MOSFET on Plug-in PCB #1 blistered and exploded. The L101 inductor nearby also looks a little singed but the enamel coating does not appear to be compromised. I do not see any other areas of the device that appear to have been compromised or damaged. I was wondering if anyone may be able to assist with what actually went wrong here. I have ordered a new power supply board as well as a replacement MOSFET to try my hand and replacing the bad component. My current theories on what went wrong are: I am missing a bad solder joint somewhere that caused the issue, still attempting to find one if so. It's still unclear why the MOSFET would blow in this case as it's rated for 20V and my power supply used is only capable of 12V out. MOSFET AO0415A Data Sheet There is a step in the instructions that says to bend a tab of the LCD screen at about 45 degrees to clear the L101 inductor. I noticed that this appears to have been discolored possibly due to heat. There's a good chance that this tab was not bent quite enough and made contact with the top face of the L101 inductor, though I don't think the top face is conductive. This could have resulted in a short to ground? My winding on the RWTST Transformer is somehow incorrect. Image upon powering up. Seconds before smoke and pop. Note: I did not press the left dial in, the screen lit up as soon as power was supplied to the barrel connector.

Hello, I completed building the QMX yesterday. The initial plug in went smooth, no smoke no current draw. I booted the QMX into update mode, put the firmware on it no problems at all. Then I removed and re-inserted the dc plug and tried to start the radio by pressing the left encoder, suddenly I saw big current draw (stupidly i forgot to limit my power supply) it went up to something like 7 amps, so I unplugged it immediately. I dint see any smoke but the device did get hot in some areas. Visually I do not see anything burned on any of the PCB. So now, when I plug the radio in the DC plug nothing happens until I press the left encoder which creates a short and puts the power supply into constant current mode. (This time limited...) Can anyone please advise for any troubleshooting steps? I put some pictures of the boards in attachment. Thank you.