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Hi all SSB firmware was released into beta on 17-Mar-2025 after 9+ months of development. Many thanks to everyone who bravely helped test it and patiently provided their feedback and observations. There are now quite a few YouTube videos, forum reports and other social media mentions about on-air successes with QMX SSB. Now that it has been at least 6 weeks in beta and I believe most of the issues have been resolved, it's time to promote it to an official version. I have called this version 1_02_000 and published it on the QMX page http://qrp-labs.com/qmx where I have also published the updated operating manual, which grew from 111 pages to 134 pages. The main changes are: SSB (obviously!) including CESSB, TX Equalization, Mic AGC, VOX, Pre-distortion and and and... Addition of up to two more USB Virtual COM serial ports (up to three total). All of the hardware tests such as RF and SWR sweep, and Diagnostics, are now available on the LCD too. New CAT commands for LCD contents, S-meter, AGC-meter, Power meter, SWR meter, SSB source Complete list (relative to 1_00_027 the previous official version): SSB modes added (USB and LCB), with CESSB, TX Equalization, Mic AGC, VOX, Phase pre-distortion and more Rationalization of menus, grouped into CW, Digi and SSB submenus (now Keyer and Decoder are submenus of CW) Added up to two more USB Virtual COM serial ports (configurable) LCD versions of AF, RF, Image, LPF, Test ADC I/Q sweeps (miniature graph on LCD) New function PA mod. test to check operation of amplitude modulator Diagnostics screens are now available on the LCD interface too Now remembers previous menu location on ALL menus regardless of nesting level Add way of forcing factory reset, press Menu (left) button during power-up Change TX color in diagnostics screen from red to blue, to avoid confusion since red things are errors Added CAT LC command to retrieve LCD contents Added CAT commands SA (AGC meter), SM (S meter), PC (Power meter), SW (SWR meter) Added CAT command SS (get/set SSB input source) Bug fix: PTT P did not work properly Bug fix: Incorrect PA voltage display on the Diagnostics screen 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hi everyone. With the release of the SSB firmware out of beta, I thought I would make my offer to source K6ARKs wonderful little microphones, which can be found here: https://www.printables.com/model/320559-mini-microphone-for-qmx-trusdx-usdx-kx2-and-kx3, one more time. Adam (K6ARK) made a super fantastic little miniature mic case, and they work with the QMX quite nicely. I print the cases in PLA, and have the following colors available: Black, White, Grey, Navy Blue, Orange, Light Green, Red, Gold, Purple, Sand Stone, Light Blue Stone, Turquoise stone, and Marble Stone (The stone colors look like marble or granite - little flecks of darker color in them - The marble one winds up looking like bleached bone). The kit includes: 3D Printed case in PLA 3.5mm jack Electret Mic Element Microswitch for PTT For each mic, $10 for kit, $15 fully assembled and tested. This price includes shipping in the US. I am happy to make you more than one, some people want one for home and one for the go bag, that's great. You will need to provide your own AUX cable (3.5mm male to male) to go between the mic and the radio. I have had several ask what cord I am using, So I have included this link to one I am using and that I test all my assembled mics with; it seems to work quite well: https://a.co/d/36GDDXf (This is a shortened, non-affiliated link to Amazon.com page for the cable I use) If you are interested, send me a private email, and I will send you payment details. My email address is good on QRZ.

Hello Don, I'll take one if still available. Sounds like just the safe p.s needed. 73, Ron K0OXB Liberty Hill, Tx Yahoo Mail: Search, Organize, Conquer

My BS170s failed in my QMX+. There was no power output showing on my Power Meter, the QMX display contrast had changed, the QMX case was getting warm, and the battery voltage icon on my QMX display was flashing. My supply was 12v limited to 2 amps. Here are my steps to diagnose and repair my QMX+. I will add pictures, I hope groups.io will keep them. 1) Power off and remove the supply and all connections. Remove the case top, bottom, and rear, and remove the washer and screw holding the BS170s to the PC board. 2) Connect a dummy load and power supply. 3) Power up and quickly check the temperature of Q503, Q504, Q505, and Q506 with your finger and if you have one, a digital infrared thermometer gun. I checked the temperature with my finger first, and two of the BS170s were too hot to touch and two were room temperature. The two hot BS170s measured 94F and the other two measured 78F. I powered my QMX down after about 20 seconds, because I did not want it getting too hot. After a cool down period, I powered it back up to make other measurements. The temperatures of Q507 and IC503 were close to ambient. I measured the voltages on Q503, Q505, Q507, Q513, and Q515 to be as follows: Q503 and Q505 Source 2.35v Gate 0v Drain 0v Q507 Source 2.44v Gate3.3v Drain 5.9v Q513 Base 0.4v Q515 Base 3.25v 4) Because of its high temperature and obvious high current draw and after powereing off and disconnecting the power supply I cut just the Source lead of Q503 and Q505. I powered up and measured the voltages on Q507. No devices got hot. Q507 Drain 11.3v Source 11.3v Gate 6.7v 5) I powered back down and remove the PS. I then cut all the leads on Q503 and Q505 to remove those Mosfets. I cleaned the board with Q-tips and denatured alchohol. To remove the leads from the circuit board I held the lead on the front side with needle nose pliers and heated the back side with my 140W weller gun. When it became loose, I pulled the lead out thru the front. While heating from the back side I sucked the solder out of 4 of the 6 holes with a solder sucker. The remaining two holes were connected to the ground plane and I didn’t try to clean them out. 6) While heating the one hole not cleaned out from the back side, I started a new BS170 into Q503 and Q505. I continued heating while lowering it down to a proper height. I then folded it over, checked the fit, and soldered all three leads of each Mosfet. I affixed all 4 Mosfets to the PC board with the screw, washer, and nut. 7) I soldered and trimmed the leads on the backside, and inspected them. After connecting back the PS and dummy load and powering on, Q503, Q505 and Q507 measured as follows. Q503 and Q505 Drain 0v Source 11.3v Gate 0v Q507 Drain 11.3v Source 11.3v Gate 6.7v I measured the power output to be 3 watts on 20m. I also ran the PA test which was as expected. 8) I reinstalled the QMX in its case, connected the dummy load and PS, and ran the SSB calibration, which completed successfully. Hope this helps! NQ5P

On 4/29/25 I had a CW practice / rag chew session on 17 meters. I worked four stations: Conditions were OK with some QSB. SSN = 134, SFI = 154, A = 4, K = 1. My next CW practice session will be May 06 at 0900 EDT / 13:00 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 - May 06 2025 Time - 0900 EDT / 13:00 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

First VARA (Winlink) tests with the new SSB-firmware. CESSB is turned of for that. Looks like that it works flawlessly.

Greetings! First post. I'm a seasoned electronics kit assembler with above average skills. That said, I have virtually NO skills with radios, but am a quick learner... I'm confident the electronics assembly is OK, but unsure about the coils and possibly enamel coating issues. This is a screen cap of the results from ADC I/Q test: Based on the 1_00_027 operation guide, this should be a pair of sine waves slightly timed differently. All of the bands are pretty similar, and most tests are way off like this. I suspect the trifilar phase splitting is shorted and needs rebuilt, but wanted to make sure before I redo it. My concern is that when I twisted the 2 wires together, I used a drill and may have wrapped them so tightly the wire cut through the enamel coating. In the Operation guide, it seems to indicate this trifilar phase splitting transformer tends to be involved when multiple tests are not normal. What do you think? And THANK YOU in advance!