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I have an unbuilt QMX+ R1 with case and GPS. $150 shipped CONUS WA4DT Good on QRZ.com

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_007 to it. This fixes one more typo I found in the USB compound device configuration. I carefully checked all 440 bytes one by one in all three configurations (1, 2 and 3 serial port). I believe in the 1-port configuration the configuration is byte for byte, identical to 1_00_027. Waiting for Ludwig to confirm any issues or not with WIn 7. I booted my PC into Windows 10 on the old HD and all three serial ports worked properly, and audio too. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

I'm on the DXLog development team and struggle with implementing the drivers for the QMX and QCX models. If I had access to them I could do reverse engineering but unfortunately I don't. The CAT part of the QMX/QCX documentation is not very detailed and unfortunately also somewhat inconsistent. Since my help desk ticket remains unanswered I am turning to this reflector. The challenges I face are the following: RD/RU Is the implementation of the RD and RU commands really the same as the TS-480? The documentation suggests otherwise. With the TS-480, RD must be followed by exactly four digits and decreases the RIT with a certain number of hertz. RU works the same but increases the RIT. The QMX/QCX documentation seems to suggest RD instead sets the RIT to an absolute value and that a sign also must be included in the command (like with Kenwood's RF command). How does RD/RU really work with the QMX/QCX and what is the format? FA/FB With the TS-480, the FA and FB commands must be followed by exactly 11 digits. The QMX/QCX seems to accept a varying length. Is this true? IF With the TS-480, the mode field (character number 30) returns the same code as MD. This does not seem to be the case with the QMX/QCX. Is this true? Thank you in advance, Bj?rn SM7IUN

hi How much max current does the QMX draw during SSB Calibration? is about 750mA by 12V ok? It is my new QMX kit. After cleaning of all soldering points(NARF), and build the QMX in 1 Day, i started it and WTF? No Smoke, and full working. An happy day for me. A liitle bit frustrating too: there is no space left in this device, on this device i had to cut a bit from the head of a nylonscrew, bending soldering points from the pa. They hitted the enclosure and i could not close it correctly. The Screw of the "PA cooling system" was pressing against the ic next to it, dunno why. i filed the head and all is ok. Mostly :P great fun to build it. 73

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.

Yet another morse decoder. Just hold a pc microphone to the loudspeaker or use a stereo cable to the PC mic input. No installation required, just deposit the file on your hard drive and open in your favourite browser. Works on PC, Linux and Mac, probable also on Android and IOS. I would have put it in the files section but it's full. Download link for Mega: https://mega.nz/file/6ZAABBxD#ewDQhNIXx5OJeCSVBkUq38uziKrgNMukCi96HzXlEEw Enjoy. Paul DJ0CU G4ADF

Hi all. I’ve ordered mentioned kit few days ago and now I’m looking for antenna and atu. Does anyone have an experience with manual atu? I’m looking at kanga products pocket transmatch, mainly due to size of it and would like to pair it with Sotabeams band springer wire. What are your thought on this combo? Would you suggest any alternatives? Ideally the kit would be as small and light as possible as it’s not gonna be the only radio I carry. I don’t mind making my own antenna so please share some designs with me if you can. I’m also ok with commercially available kit. thanks in advance. 73 de 2E0TZG

Hello smart people, So I assembled an Ultimate 3s WSPR kit. I booted it up, hooked it up to a dummy load, and everything worked as it should. But then, a thought. What am I supposed to do for an antenna? My main station uses a ZS6BKW dipole, and my first thought was to take a piece of coax, solder the main wire to the "RF" pin, twist the shield wires of the coax into a single strand and solder that to the neighboring "gnd" pin, put a connector on the other end of the coax and use it to hook it into the ZS6BKW. But then, another thought. How am I gonna tune this? No problem, I said. The ZS6BKW is resonant for me on 40 meters, so I put in the low-pass 40m filter, and gave it a go. Everything looked and acted like it should, but when I looked on http://wspr.rocks/, no contacts. Then I took my IC-7300, dialed it down to 1 watt, and tried it on WSPR. Plenty of contacts, no problem, so I figure if I can get a signal to the ZS6BKW with the Ultimate 3s, I'll be ok. But I have no idea what to try next. I'll include that it includes the GPS receiver, which seems to be working fine. I have a feeling my problem is something simple, and I'm gonna feel dumb when I get it, so please be easy on me if I'm coming across as a noob. But any help would be appreciated.

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 QMX Plus is approximately 25% down on the Test Certificate power, so I am looking to replace one of the BS170 FETs. The Farnell catalogue has many different suffixes to their BS170 devices. Should I select a particular device?

All, Ive loaded.004 and it seems to work well on my QMX 80-20. I’ve made a number of successful contacts on ssb. On my QMX 20-10 it has distorted audio after the update. I did a factory reset then calibrated. It was after this that the transmit audio is very distorted. I went back and changed the settings to the last known working numbers but it’s still distorted. Can anyone tell me if the new .006 has helped this? I’m about to load it in both QMXs and the QMX+ and was wondering if it has helped? Does a firmware update require a factory reset and calibration or leave it be? Thanks.. Don N6NLX

Hi Hans. I have gone over the checks again. I can connect with putty just fine when USB ports is set to 1. With ports set to 2, putty brings up the terminal screen if I connect to either of ttyACM0 or ttyACM1, but pressing Enter does nothing, no response from the QMX+. I don't think I am missing anything. 73 Roger 8P6RX dmesg: [86189.609046] usb 1-2.1.3: USB disconnect, device number 9 [86192.131831] usb 1-2.1.3: new full-speed USB device number 10 using xhci_hcd [86192.247357] usb 1-2.1.3: New USB device found, idVendor=0483, idProduct=a34c, bcdDevice= 1.00 [86192.247375] usb 1-2.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [86192.247384] usb 1-2.1.3: Product: QMX Transceiver [86192.247392] usb 1-2.1.3: Manufacturer: QRP Labs [86192.303007] cdc_acm 1-2.1.3:1.0: ttyACM0: USB ACM device This works Set ports to 2, power QMX+ off/on [86268.713111] usb 1-2.1.3: USB disconnect, device number 10 [86271.110082] usb 1-2.1.3: new full-speed USB device number 11 using xhci_hcd [86271.227391] usb 1-2.1.3: New USB device found, idVendor=0483, idProduct=a34c, bcdDevice= 1.00 [86271.227411] usb 1-2.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [86271.227422] usb 1-2.1.3: Product: QMX Transceiver [86271.227430] usb 1-2.1.3: Manufacturer: QRP Labs [86271.310514] cdc_acm 1-2.1.3:1.0: ttyACM0: USB ACM device These do not work [86271.454483] cdc_acm 1-2.1.3:1.5: ttyACM1: USB ACM device

I forgot the first rule of radios - if something works, don't fix it. Anyway, I wanted to replace the diode that I have been using for the Rev 2 board modification with a smaller diode. I replaced it and found that the radio would indicate high SWR every time I transmitted, so I put the original diode back in. Now I can't hear any RF signals. I can't even hear the "normal" birdies. I'm attaching a picture of my "work". Have I ruined L503? I'm also afraid that I may have destroyed the trace at that end of L503. Any suggestions would be helpful. Thanks. 73, Mike, KL7MJ

Hi, I have released a version 1.2 of the solution. Please refer to the readme front page file at the git repository with details: https://github.com/AC8L/QMX_Plus_Autotuner_Internal_Battery_Speaker/ While I am writing this note - a group buy with 35+ participants is happening for this same version 1.2 - organized by Cal (AD8Q) and Stan (KC7XE). -- 73, Sardar (AC8L, 4K6SA, VA3DUA).

If upgrade from 1_00_027 to 1_01_007 should the SSB function and or to what degree without calibration? -- 73 ChuckR

Morning all, I was wondering if there was a way of reducing the power output in the configuration rather than simply by reducing the supply voltage. I would like to drop to around 2-2.5 W for general use as I’m hoping to complete my QRP DXCC on 20m with my QMX once it is back up and running. Many thanks. Piggly

On 4/28/25 I had a CW practice / rag chew session on 20 meters. I worked three stations: Conditions were OK with some QSB. SSN = 119, SFI = 156, A = 6, K = 1. KA1HCF, Gil in St. Augustine was using a FX4C that was way off frequency. I run with a very wide filter for the practice sessions but I had to RIT almost a full KHz to hear him. I could not find an email for him. If Gil or anyone needs help with getting on the air, the Michigan QRP Club has a weekly Zoom meeting specifically to help folks with any Ham questions or any help that they may need. Info can be found here:Michigan QRP Club. My next CW practice session will be April 29 at TBD EDT / TBD UTC on TBD meters. Tomorrow looks like all day rain. I will operate on and off most of the day and will depend on if and when there is lighting in the area. I will pick the band/bands based on conditions and time of day. So be sure to look for me on the RBN. 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 29 2025 Time - On and Off throughout the day Band - Depends on conditions and time of day 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

The following items have been updated in the Files area of the [email protected] group. //QMX_QMXplus_Hardware_Mods_V1.1.pdf By: OE1IRA <stangeler@...> Description: OMX/QMX+: Some hardware modifications, including: TN0110 FETs, LP+BP filter retuning, better diodes for the SWR/power detector, drain voltage limiting.

Super useful Windows USB utility. Shows tons of info about all USB devices to help troubleshoot USB/COM port issues. USB Device Tree Viewer at www.uwe-sieber.de https://www.uwe-sieber.de/usbtreeview_e.html#download Donation ware. 73, Steve W1SRD