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Yes - I noticed that too late! My bad, the QMX should connect to XCVR. 72 Sandy KB3EOF

Great setup at low cost. One thing just wonders me: is the QMX connected to the ANT side of the tuner?

Ahhhh, 13.8v. That explains it. I target 4w at 12.0v when building (matches the graph in the manual). Hans has warned against running more than 12v on page 4 of the manual -"Do not power a QMX with

Hi Mike, Nope, I built for 12V.? Changed L513 back to 10T and squeezed turns.? Played with L512 to optimize 40m (and 60m).? Now have right around 6W on all bands with 13.8V PS. 120 ohms looks

I've started playing with a spectrum analyser, this is what I have so far. There's a bit of scruff round the signal and the second and third harmonics are about -60 dB which seems pretty good, better

Sure thing Dan - here is a sketch and photos. It is a simple OCFD and I optimized it for 40-30-20 meters using antenna modeling software (MMANA). The 4 state tuner tunes it easily on those three

I had the exact same initial boot sequence experience. After power cycling and pressing the left encoder button, the magic smoke was let out. I went through the first 2 steps of G5CTH Chris'?

What is your input voltage? 9v? How are you measuring power out? Yes I would go back to 10T on L513. I haven't built a 9v unit and I suspect yours is 9v. Likely, the L513 tweaking is probably only

Thanks for getting back Kees. I flooded the area with flux and then used a T12 - JL02 tip. It is about the size of a tooth pick - hi! It must have worked since the firmware update was

Hi Group, I just finished my QMX build, Perfectly functional right out of the gate, pretty happy. While very densely packed and easy to screw something up, I gotta say BRAVO Hans!? What a fabulous

Hi Cliff, I appreciate your having taken a look. B1 to B2 does indeed have continuity, as noted. The results for those checks were duplicated, and remain consistent from the first round of checks

Could you post a sketch of your antenna?? Thanks? Dan

An addition that I should have included in the prior post: In my estimation, simulation is good to help work out issues with a design.? Actual measuring should be done for an individual radio.? If

Mike, I'm glad to have learned that I can adjust overall brightness by changing values of R306. If I want to adjust this in the future, I now have some values to try. 73

Willie and John, I believe that the simulation works for the QDX version of the amp.? I'm unsure about the EER/power addition of the QMX.? That may be more of an issue when Hans offers the SSB

Mine had the same behavior, the whole time I was running off of 4S LiFePO4, with Batt Full set to 13.200 and Step set to 0.233. Ever since I switched to 3S Li-Ion, with Batt Full set to 12.600 and

Hans! I am 20+ years your senior. It should be me grumbling with skepticism about your simulations and not vice versa! :-) Smiling anyway, JZ

Hi all, this is not really a problem, but? .... The battery indictaor does not show a value after the QMX is started - it is "empty". First, when I press the left? and then the right pushbutton,

That's awesome, Karl! Great job! :D Yes, you could shift things around to try to move some of the peaks down, but the numbers as is, are certainly good enough to put into use right now, so you can

Hi Willie Yes, spot on. That, and whether the diode and/or zeners add anything to the receive noise floor. Probably not. But I need to measure, simulation isn't good enough for me :-D I tried to