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Hans said it is set up for noise cancelling currently. ? You won’t sound very good ..?

The former output powers were taken using JS8Call software and show the power transmitted with JS8 mode.

I took the same measures using the "transmitter test" of Putty, clicking on "T" and read the following values:

- 30M - 2.7W

-20M - 3.7W

-17M - 3.8W

-15M - 1.5W

-12M - 1.5W

-10M - 4W

I should maybe finely tune the 15 and 12M bands and am satisfied witht he 10M result, which is important currently with the high solar activity. I have been heard on the East Coasts of Canada and USA on 10M with JS8 signals as recorded by pskreporter.info, around 9,000 miles, not bad for less than 4 Watt!

A last remark: replacing the 4 BS170 and removing the output transformer to rewind it was not an easy task for a 80 years old OM with bad eyesight and shaky hands but I definitely think the QDX very tiny board is well designed and manufactured and will accept abuse! This let me confident for my next build: either a Mid-band QMX or a QMX+, the latter being preferred.

73 - Pierre - FK8IH?

I've just tried transmitting SSB using the internal mic to a dummy load, with my K2 next to it to receive the SSB signal and record the audio.

Although the background noise was loud whenever I pushed the PTT button, my recorded voice was also loud and clear. I set the mic gain to 60 and compression to 10.

So the internal mic is already useable I guess? Anyone tried the internal mic to make a real contact?

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Yoon KM6KJI

I just replaced the 4 BS170 of the PA of my Hi Band QDX and I replaced the "conventional wound transformer for 12V" by a "WTST for 9V wounding", expecting an increase of output power. With the former transformer and BS170 I got only 1.5W on 10M band.

Now I have the following output power in a dummy load:

- 30M - 2.70W

- 20M - 3.50W

- 17M - 3.40W

- 15M - 1.2W

- 12M - 0.6W

- 10M - 1.6W

What toroids should I tune by spreading or tighening the coils?

- L2 or L6 or both?

- L3 or L8 or both?

- L4 or L10 or both?

The RF filter sweep shown by Putty gives:

- 30M minus14 from 10 to 12MHz then falling

- 20M minus15 at 14MHz? then minus23 at 15MHz

- 17M plus2 at 17.5MHz

- 15M plus6 at 21MHz

- 12M minus1 from 24 to 27MHz

- 10M plus4 from 27.5 to 31MHz

These results seem OK except for the 20M band. What should I do to the L12 toroid whin I built according to the manual to try to improve the 20M RF filter sweep and i the same time the 30M result?

About the 30M band, I just replaced in the "Band configuration" the 11M original settings by 30M settings with the same values as 20M (0 for both LPF and BPF numbers).

73 - Pierre - FK8IH?

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Dan, you are not the first who has slipped with a probe.? Many of us have done that.

Yes, it's probably just the smps - at least we can hope so.? It's easy to short the 12V to the 5V or 3V rail, which will burn out one or more of the protection diodes like fuses.? And thankfully so, since they normally spare us from more damage to other parts.

And Yes, following that thread on testing the power supplies is a good place to start.? The wiki here also has a procedure to independently test the smps cards.

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?If you have a lower-voltage power supply to use while doing tests, it will help prevent possible further damage - like 7-9V, preferably with a current limit.? But I think you said you don't have the current limit, so it's ok to use whatever you have, just be careful.

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I haven't gone back and read that whole thread, but I would start with more measurements with everything still put together, except the bottom cover off.? Identify the pins on the power supply connectors for V+(12V), Vcc and Vdd, and a good ground point to measure against.?? Push the power-on button and hold it in while measuring the values on each of those points.? Don't keep the power button pressed for a long time, since something is likely shorted and will be heating up.? These measurements can help you (and us) know what you are starting with, and where to focus efforts.? While you are at it, bonus for measuring the other signals, like Power_On, Power_hold, Lin_Reg_En.

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Stan KC7XE

No small feat, and 3 firmware revisions already released in the first week!

Hi

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I built a QMX mid-band, it started up first time and everything seemed pretty normal except for low power output.

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tx into a dummy load with a 11.9v supply:

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Hi All,

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So, I see the SSB desired upgrade is now released as a beta version.

I decided to glance at Hans, write-up.
Hans write I will shortly give a brief introduction to SSB on the QMS..."... And he goes into a fully detailed explanations, with links to Geek deeper into the matter.?
Casually mentioning features he implemented that would be mind blowing on any other platform.?
I am so far down the rabbit hole I might not resurface until tomorrow.
You have to love Hans.

a.

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I've just been printing them one at a time. It takes 45 minutes to print a set, whether you print an array or one at a time, and this way is less prone to errors in my experience. I did set up an array of 10 on the bed last night when I went to bed because I wouldn't be here to watch it all night, but something went wrong in the middle of the night and I wound up cleaning a glob of plastic off my print head, replacing the nozzle and re-levelling my bed this morning before I could print again.. It's working to print them one at a time.

This update hang issue is kind of all over the place.

I had run into it upgrading to .002 but didn't fully characterize it because the resolution was fairly easy.

I have 2 QMX and 2 QMX+. (Sorry, I can't help myself....)

QMX 1 - Upgrade from .002. Displayed the symptoms below and also didn't enable the USB drive until I pressed the power button after I put it into update mode. The USB drive remains active and shows both the old and new firmware files after the file transfer. Unplug power, plug back in, turn it back on and the upgrade succeeded.

QMX+ - 1 Same as above.

QMX 2 - Upgrade from .002. Worked as expected. It turned on the USB drive, then off after file transfer, and rebooted on it's own after the transfer.

QMX+ 2 - Upgrade from .001. Worked as expected. It turned on the USB drive, then off after file transfer, and rebooted on it's own after the transfer.

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Randy, N4OPI

Hi Nate,

Got any pix of the improved heatsink on the QDX? I've burned out 2 or 3 QDX rigs.

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Tnx

Jim W7LS

hi, did the update on my qmx 80-20 tonight without any trouble...

calibration takes around 30 minutes, but cannot test SSB yet, have ordered a mic , so in a few days I can test "the ride" ?

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vy 73 and many thanks to Hans and his great team?

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ps: today I will upgrade my qmx 20-10 too and next week my qmx+ will arrive, waiting for directly updating ?

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Mine is doing this as well.?

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73, Dan - W2DLC

That update 'hanging' happened with the prior two releases on a couple of my units.

I don't believe it is related to the new firmware; it is something that has always been there; just happens sometimes.? And sometimes when you put it in firmware update mode from the menu, it doesn't auto restart and bring up the drive - you have to press the power button to make it start up.

Stan KC7XE

On Fri, Mar 21, 2025 at 07:00 PM, <adam@...> wrote:

When loading 003, it hung for about 5-8min before the drive disconnected, and then it did not reboot. I had to pull power in order to get it to power back on.

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Contact Jeff Moore W1NC. He has repaired many QMX and QMX + rigs. You will see many positive posts regarding his work.?

Typically when I move new firmware over, after the file finishes copying, the drive disconnects, and the device reboots.? When loading 003, it hung for about 5-8min before the drive disconnected, and then it did not reboot. I had to pull power in order to get it to power back on.? Not sure this is a "bug" or circumstance related to my system and my setup.

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Still waiting for some parts to come in from digikey.? In the meantime, I have been making contacts across the bands with some earbuds that have an integrated mic plugged into my compute.? the QMX SSB is setup for audio over USB, and using Ubuntu 24.04, I have setup two loopback devices.?? One that takes the mic from my earbuds and feeds it to the QMX over usb, and another that takes the Rx audio from the the QMX and feeds it to the speakers of my ears buds.?? I have used VOX, but prefer to leave my CW paddle hooked up and use the left paddle to trigger PTT.?? This is specific to my setup, but it should help you to get an idea for your own system:

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Earbud Mic to QMX:

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QMX to earbuds:

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Commands to help list the sources and the sinks:

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How to unload the loopbacks when you are done: