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Chris, first half of tests was done with smpsu boards removed from main board.?

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Second part, pressing the power switch, was re-assembled.

My antenna system is rather compromised at the moment, so I'm not sure whether I will be heard, but I will try!

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Thanks for organizing these, Ed.

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Greg,

N1TR?

I finally had enough with the ESD upsets when touching the knobs.? On the last occasion I lost my memory settings due to to a reset.? ?Today I worked out a solution.? I cut a piece of copper foil and punched holes in it to fit under the encoder nuts and around the push buttons and microphone.? ?I insulated around the circuit board areas with black electrical tape on the edges.? ?I would have used Kapton tape but do not have any in my supplies.? ?I originally tried grounding the foil by soldering to the BNC connector but realized that it would block the encoder board from passing through the display board opening.? I soldered a wire from the foil to the power input ground.? ?Put on my fleece jacket, rubbed it round on the chair and touched the knobs a bunch of times.? No upsets.? ?It wouldbe a good design upgrade to put a surface ground layer on the encoder board that the mounting nuts can make contact with and include a path to system ground.

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Dan,

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never ever run a QMX with SMPS boards if the off line tests are not ok!!!

It looks like a short at VDD (or a faulty PCB#2).

Please remove all subboards and check resistance at the mainboard VDD-GND and VCC-GND. Both should be some kOhm. If only a few Ohm one or more element(s) connected to this voltage rail is broken (or the rail is shorted by a solder whisker or so).

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If resistance is not ok, you have to search for the broken element, not so easy.

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If resistance is ok you have to repair both SMPS boards or use spare parts from QRP Labs.

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If all is ok you need for start at least 200 mA, use 250 mA limitation @ 6.5 V.

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73 Ludwig

Are your tests with the power supply boards unplugged?? Not connected to anything?? If so then quite a lot of both boards seem to be bad.? They are both shorted to ground enough that the current limiting is restricting the voltage.? You talk about holding the start button down, that won't be connected if the boards are unplugged.

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100mA is a bit low for a test with the boards fitted because the processor takes about 200mA on start up.? It might be worth increasing the current limit and see if VDD will get to 3V.? Don't go over 250mA, if that isn't enough there's something failed.

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Chris, G5CTH

I am interested and tried to send another email. The first one I sent bounced. Not sure if it is on your end or mine. I did get your email and attempted to reply.

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OK folks, did some measurements a few minutes ago and have interesting results. But first, to answer a couple questions: The power supply is not current limited, and the voltage is a pretty solid 11.7-12.0 volts. This happens ONLY in CW - I am at firmware level xx.027 - not the beta SSB version. And this happens on either a real or dummy 50 ohm load.

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Looking at the PuTTY diagnostics panel, it appears that there is a problem in the "Bias SMPS" area. On a known, working QMX+ when I press "T" the Current in that section is 30.5 ma, Duty Max is 50%, and Duty Cycle is 16%. On my new QMX+, pressing "T" results in the current flopping between 0 and 41 ma, Duty Max is 50%, and the Duty Cycle is 0%. Clearly a problem in the Bias SMPS area. And that is where my electronics knowledge hits me in the face. I have no idea where that Bias SMPS is coming from or what component(s) might be the ones to look into. Bad solder joint - possibly? Yeah, I could re-heat solder connections, but it would be nice to zero in on a specific area. Bad component - maybe? But where does this inexperienced Sherlock Holmes start?

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Jim / K7TXA
Eagle, ID

SKCC 10447T
BUG 301

There is plenty of 10m activity on FT8 right now, at least where I am.? Check your audio card settings.

Stan KC7XE

Is 10m active today? Because I get around 3w out but I hear nothing on ft8

Hi Stan

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Thanks for the pointers.

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I got hold of a current-limiting PSU, and did the tests suggested in the wiki here: /g/QRPLabs/wiki/37128

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on PCB#1:

step 2, I got Vcc = 4.1v (should be 0v)

step 3, I got Vcc = 4.2v (should be 0v), I stopped there

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on PCB#2

step 1, I got Vdd = 0.67v (should be 3-3.3v). I stopped there

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Here's the results with a 8v supply, 100mA current limit, holding down the power switch:

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(on PCB#1)

12v goes to 5.3v?

Vcc goes 0.2v to 2.1v

pwr_on goes 7.4v to 0v

pwr_hold stays at 0v

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(on PCB#2)

12v goes 0v to 5.2v

Vdd goes 0v to 0.1v

lin_reg_en goes 0v to 0.01v

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when I do click the power button, current limits at 100mA every time.

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Hope this is useful

Cheers

Dan

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Roger great to hear its working! Thanks for sharing. Your picture got me curious - what antenna are you using with the tuner and Elecraft balun?

About the best option for sharing physical COMM ports is using TCP/IP.??

?? > Something like SoCAT can be used and is available on may operating systems, but that would require a lot of manual configuring.

?? > I believe FLRig is available on most operating systems, and is a good option for doing this.

????? WSJT-X has a radio option for it, and most logging programs will also connect to it.

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There is also a hardware option - create your own 1-wire (plus ground) serial BUS. And connect to multiple physical computer ports.

?? Just mimic the Icom CI-V connections, which requires several 2N2222 (2 at each device).

?? Icom uses addresses, but the reality is that every device connected, will receive the data, and any device can send.

?? Addressing, just makes sure the right device acts on it, but in your case, it would work.

?? I won't go into any more detail here, since this really is more effort than value (in my opinion), but mentioned as an option.

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-------
Robert Giuliano

KB8RCO

Got your order, Glen. Also sent you a private message John.

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My bubble mailers didn't show up Saturday like they were supposed to, Amazon is telling me they should show up by Tuesday, so it looks like I should start shipping these out by Wednesday.

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Thanks for the great response guys. I have been having fun printing, putting together, and testing? microphones all weekend. I will order more parts as needed to fulfill orders, just trying to make it so as many of us as possible can enjoy this awesome mic that K6ARK designed the 3d print for.

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My email is good in QRZ.com for anyone interested in getting one of these, send me an email and I will send you payment details.

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Erik

I try to repurpose that stuff all the time. Did it have that ribbon wire in it? Thats the wire with laquered ribbon wrapped on some kind of poly thread that's? impossible to solder; found in most ear bud/mic sets.

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If so how do you solder that stuff?

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regards,
Bryan, N0LUF

Either way would have been fine.

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Releasing SSB firmware for 80m only, no CESS, limited menu, no support for CW or digital modes,

no calibration step would have shut down the "This EER SSB Stuff Can't Possibly Work" posts.

And many here would have been happy to try out an early version of 80m SSB.

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Pushing through and releasing it in more or less final form may be for the best, assuming Hans recovers.

It's mostly bug reports being reported, often stuff Hans wasn't aware of, not reports of needed additional functionality.

It would have taken months for Hans to find those bugs, releasing piecemeal would likely have a larger total bug count,

more documentation to write, more discussion in the forum.. All at once makes best use of his time.

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I'm just happy it's out, and that it mostly works.

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Jerry, KE7ER

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On Sun, Mar 23, 2025 at 02:55 AM, Chris wrote:

Hans:

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I tried changing the 80/20 band swap advanced setting and it didn't fix the problem, but it changed the behavior a lot. It now runs longer before quitting.

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In another thread, others with this problem are suggesting that the configured center frequency in the band table might have something to do with the problem. I believe that's used as the frequency to run the tests.

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I'm thinking I may have to improve the BPF center frequencies to fix the problem.

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M

I found the setting in the second page of the Advanced configuration menu. It changed things (it runs longer now), but didn't fix them:

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M

My version 1 PCB installed an earlier band table with the band centers on the FT8 Frequencies. I'm having this sort of trouble on 80 and 40 meters.

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I think there may be a problem if the test frequency is too far down the slope of the BPF curve resulting in low signal feedback for the tests. I've mentioned it to Hans and he told me to try changing the 80/20 band swap, but I haven't quite figured out what he meant yet. ?My BPF filters are skewed quite a bit on some bands (but the manual indicated this was nothing to worry about at the time).

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I'll try to figure that out, but I'll also try moving the band centers and see what that changes in the calibration test.