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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

Decided that seeing I have the GPS installed, to revisit beacon mode. Setup all the parameters including frequency 14097.200. Well it seems to Beacon OK...I can see that it is transmitting. Problem is ...it is not on 14097.2....in fact I have no idea if it is even on 20m. Bit of a glitch here ?

de VK6XT?

On Fri, Mar 28, 2025 at 03:14 PM, Muhsin TA1MHS wrote:

On Wed, Mafot r 19, 2025 at 10:56 AM, KEN G4APB wrote:

Hans said…..Sure! We are currently preparing 500 more of the 10W Linear kit. I have the PCBs on the way with FedEx and everything else is here in hand already!

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So what are all these going to be used with?

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I've wondered if the second stage of the 10W linear could be hooked into the QMX between the existing PA and the LPFs, sort of where T501 is.? T501 would become two transformers, one would provide the drive for the PA stage, the second would manage the impedance transform to the existing LPFs.

See operations manual, pg 65-68 for all the details.

Make sure to turn on/power cycle the QMX -after- you plug it into the computer so the serial port will register properly in Win10.

If choosing QMX doesn't work, choose either QDX or Kenwood TS-480.? Some versions of the hamlib in wsjt-x don't work with the QMX setting.? If you update (in wsjt-x) to hamlib v4.6.2, it does work with the QMX selection.

Choose the audio devices with QMX in the name.

Stan KC7XE

Thanks, Hans for your reply. I have been 100% CW op for some time. I was looking for a potential Lab599 TX-500 or KX2/KX3 (or fill in the name of another "QRP" rig) killer. I know,... much different radios with different design criteria. I am not doing SSB (or Digital for that matter), so I guess the CESSB won't be of any use for me. No big deal, I was just curious.

--

73, Norm/KC1BMD

qmx with win10 laptop. 2.7 wsjtx

when configuring radio it allows. me to select qrplabs qmx. but does not like and. selection for audio

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what do i need to

do to get digi modes/ft4 working?

does anyone have the. wsjtx settings?

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tnx Niece

The extra high output at 160m is normal.? Hans previously said he will reduce it because associated with it are high peak voltages at the BS170's exceeding the manufacturer's rating.? You can remove a turn from the 6m LPF inductors.

Good luck - be very careful at 160m, particularly avoid high swr and definitely don't operate with more than 12v, use 10v if possible.

Chris

From your photos, your soldering looks fine.?

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The fried transistor could be causing that continuity now.? Since you have ordered a new one, you could just remove the current one and see if the short goes away.? (It may be easier to cut the legs off first to remove the device, then un-solder the remaining parts of the legs.)

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The coil looks like it also took a lot of heat; it may be best to replace it.? You can test its continuity by probing the top of D106 and C107.? But even if it still has continuity, if there are internal wire shorts due to burned insulation, it would have a lower inductance and be less effective in filtering the power.? But it may be ok - you could also measure the inductance using the same probe points, if you have an LCR meter.

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It would be good to test D108 and see if it looks like it shorted internally, since it would also have been sinking lots of current.

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The real question, though, is "what caused this?".? I don't know.? As noted before,? it seems like one or more shorts had to be there.? I would still verify on the connector to the main board that none of the connector pins to the SMPS have any continuity to each other.? And look very carefully as you mate the control/display boards with the main board, to see if any metallic surfaces come in contact with each other.?? And next time you turn it on to test with new parts, make sure and have a 200-250mA current limit set to avoid breaking something again if there is a fault still present.

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Stan KC7XE