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Could the PA modulator be used to adjust the max power on a band by band basis?? This is something that Hans would have to implement but is there any technical reason such as overloading the PA modulator that would prevent this?

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I think that power control would be nice anyway and doing this on a band? by band basis would be a minor addition.

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Chris, G5CTH

stupid but it took me some time to understand. The COM Port can only serve for one program so if you have i.e. a logging software running with the QMX WSJT-X will not connect to the QMX. In my case I have to start WSJTX before the logging software and then that won't connect to the QMX+ however WSJTX does report to the logging software if set up to do so. Also wone thing fooled me at one point. I got messed up with the audio settings and all of a sudden the QMX showed up as QMX...3 and not 2 so I had to change that in WSJTX. Also I had to set the Audio higher as the default 54 on most bands.

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Have fun and CU on monday

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Martin

DK3UW

Hi Hans,

I have recently ordered a QMX+. Will it come with the CESSB update or will I have to install that myself please?

73 Ken

G4APB

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CESSB is more than enough. <3

As a lurker with a QMX+ kit in a sealed box waiting behind a few other projects, "The capacitors are trained to hide in the knobs on these kits" is exactly the sort of nugget I'm looking for!

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Thanks, Dick!

Hi Stan

Thank you for the quick reply.? I bypassed the LVDO but it made no difference.? But I will try another source.? Thanks...

On Fri, Mar 28, 2025 at 11:01 PM, Greg Walsh wrote:

After installing an outboard LVDO voltage regulator (ND6T circuit) my QMX+ boots up to show "Initializing: Audio system" and doesn't respond any further

I would first try a different power source.? Maybe something in your new LVDO is limiting the current such that QMX+ can't complete its startup.

Hi

After installing an outboard LVDO voltage regulator (ND6T circuit) my QMX+ boots up to show "Initializing: Audio system" and doesn't respond any further.? Putty doesn't respond either.

I have used the 'forcing update method using wire jumpers' which allows me to reinstall the firmware but to no avail.? The QMX+ just reboots to the "Initializing Audio system" screen and goes no further.? I have installed an earlier version of the firmware 026, which installs ok but still just goes to the "initializing audio" screen.? I have also reinstalled the new 003 firmware but just the same problem.

If I remove power and press the right button before powering up, the first screen shows "Initializing: Setup EEPROM" before moving on to the "Initializing audio" screen and locking there.

I have checked the input voltage at 11.5V but I can't check much else.

Can anyone offer some advice on how to proceed from here please.? The QMX+ was working fine with the SSB upgrade until this happened.

Regards

Greg

ZL4GW

Try turning on the EQ then set the EQ to +20. Listen on another receiver for a change. My QMX would start to get raspy at a setting below +14. I set mine at +20 (max) and it sounded pretty good. Then I set my mic gain to 63 and compression to 5. It definitely made a huge difference in quality on mine. It was distorted and virtually no power output. I was able to make a contact on it to Kentucky after I changed those settings.

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Don..N6NLX

You can get further on 3W than you might think, I was quite surprised.?

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The PTT signal is already avaliable,? but needs configured.? There is no time line for the Basic code - I think you could likely get your favorite microcontroller set up on the dev card much faster.

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Stan KC7XE?

I don’t think I’d hold my breath for Dayton.?

Or should I wait to see what's coming out at Dayton that will be even more amazing? But then I won't have time to get it ready for Field Day.

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Decisions, decisions.

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?