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And I just tried my Yaesu YD148 desk mike.? That worked also.? Bet it sounds better than the Baofeng.

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Hello!

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?? Browsing the QRP-labs website, I was excited to find that Hans has released beta SSB software.? I immediately loaded it into my QMX+.?? After a few false starts, it was making power, using a Baofeng microphone from my UbitxV6.? I did have to make an adaptor becuause the tip/Ring wiring is opposite from my other radios.? The mic does behave well in the hardware microphone test.?

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?I piped the output into my FTDX10 with a bunch of attenuation:? a 30dB 500W Bird, then two 20dB inline attenuators, then 18dB inside the '10.? It's recognizably SSB.? Once I got it attenuated enough so it wasn't overloading the radio, it looked nice & clean on the bandscope.

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? Alas, with 3W output, I probably won't be making many SSB QSO's.?? What I need is to patch it into my homebrew 1kW linear.

It wouldn't drive the linear to full output, but it would make 300W or so, enough to play.

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? To do that, I need the QMX+ to output a PTT signal and also a 4-bit Yaesu band code.

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? I did buy the "dev" kit for the QMX+, it's in my junque somewhere.? But - what about the software?? Can't output that

4-bit code without software.? Hans did promise some sort of BASIC interpreter for the QMX, is there a timeline for that?

Can't hack the existing software because it's closed source & encrypted.? I suppose I could put another CPU in the box,

and patch into the band-choosing lines, but what a waste - there's a perfectly good CPU in there already.? Which surely

knows what band it's on.

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??????????????????? - Jerry, KF6VB

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For my test, I was watching the output on an oscilloscope.? It clearly turned off at the end of each test.? ?I didn't even glance at the front panel, so I can't say if the power meter there stuck on a non-zero value.

Stan KC7XE?

Is it only the sidetone audio that is missing?? Do you still have clear audio on receive?

Next I would measure the voltage at each of the three terminals of IC101, the 3.3V regulator, when you press the power-on button.? ?But don't press the button for more than a second or so, since it could cause more damage, since it does not appear that you have a way to limit the current.?

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Also, do you have a way to measure the input current, with more resolution than that ammeter on your power supply? It looks like it is going up to almost 1A, but I'm sure it is not accurate at that range.? If there is not an internal power short, it should only read about 200mA while pressing the button.?

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Your symptoms indicate that you probably have a failure in your 3.3V power supply (or a device that is connected to) such that the processor can't power-on and set the power to stay on.

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Stan KC7XE?

CW Keyer ? ? ? ? ? ? ? ? ? ? ?|
?||| ?CW Decoder ? ? ? ? ? ? ? ? ? ?|
?||| ?CW passband ? ? ? ? 300 ? ? ? |
?||| ?CW center ? ? ? ? ? 700 ? ? ? |
?+|| ?Auto-offset/tone ? ?YES ? ? ? |
? || ?CW offset ? ? ? ? ? 700 ? ? ? |
? || ?Sidetone frq ? ? ? ?700 ? ? ? |
? || ?Sidetone volume ? ? 60 ? ? ? ?|
? || ?Sidetone abs/rel ? ?Absolute ?|? I reset it back to Absolute
? || ?Choose filters ? ? ? ??

I measured the frequencies used for phase calibration on my rev 1 QMX 80-20.? For 80, it is 3.560MHz; 60, 5.346MHz; 40, 7.061MHz; 30, 10.123MHz and 20, 14.061MHz. The settings of the band configuration have no effect to the frequencies used, it is most likely that when one fiddles with those settings, they are running a lot of phase calibrations, and it just happens to work one of those times. My QMX never finishes phase calibration on any band, only getting about 1/3 done before it aborts.?

Gary

W9TD

Nothing special Stan. Ran the calibration steps in sequence, one by one, using 'O', '+', 'O', '+', etc. Will run again and measure the power out in the dummy load for each IMD test (so far have only looked at the pwr indicator on the display, showing 1-4 bars at the end of each test, and back to zero bars if I CTRL+Q).

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The unit is a rev 1, assembled by me, works perfectly on all bands otherwise (CW only tested), with out power between 2.8W and 5W at 11.6V.

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72/73 de Enzo M0KTZ

In absolute,? I presume it is set to a level of 50 or higher.? One possibility- I understand that if SWR protect is triggered, the side tone won't be generated.?

Stan

I changed it to Relative and there was no change

It is set for Absolute

Can you measure the current draw from your power supply to the QMX in the following three conditions:

1 - while QMX is powered off (remove power cord, then replace it to make sure QMX is off).

2 - while you are pressing the power-on button?

3 - after you release? the power-on button (which is when it should be powered on).

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That will help determine what state your QMX is in.

OK it is WSJT-X 2.7.0 running under Win 11.

stan. tnx so much for the tip. everything is working great. ? i know i had read that but only when first received. the QMX. ?at the time i only wanted to do CW but now i wanna try some of the new FAST modes.

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so tnx again

Niece

Turning the EQ on and maxing it out to +20 took care of my distortion problem. Also tried the QRP Guys microphone and everything seems to be working. Before that it was unusable.?

I now show power out and have made contacts from San Diego to Kentucky.

I need to try it on my QMX+ now. The test I just ran is on a QMX 20-10. Not going to calibrate again. It’s been calibrated multiple times.?
Im running the mic gain at 63 and compression at 5.

My CW practice and normal mode sidetone volume works fine, just like before the update.

Check to see if your sidetone abs/rel or sidetone vol settings somehow got changed.

Stan KC7XE

Hi All,

Has anyone tested CESSB vs. SSB. Is the claim and brag ( marketing parlance)? that it is like having a 10 watt output something the 'brave'?

feel after installing the new firmware? Is there a noticeable difference??

73,

George?

K3GK

I updated my QMX and in the process I get no sound during practice.? It is sending but there is no volume.

any ideas as to the issue?? Has to be a new setting.

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In the process of figuring this out I am updating my QMX Menu Reference.

On Fri, Mar 28, 2025 at 06:19 PM, paul G0HEU wrote:

is there any way I can “smooth” this out a little, drop 160m down and increase 6m ???

You can only do this balancing act with bands which share a lowpass filter.? Otherwise, it is mostly the output transistors (and I suspect their drivers, which have to drive their gate capacitances) losing "oomph!" at the higher bands.? Component losses and parasitics are worse at low VHF as well.

73, Don N2VGU

Enzo, I checked a couple of IMD optimizations on my QMX, and this does not happen.

Others should check.

Anything else special about your setup or the sequence of test steps you did?
Stan KC7XE