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Hans - It looks like we have a real problem for many (most?) of us! Perhaps it is a bigger issue than we all realised. I welcome your comments please, meanwhile, back in the desk drawer it goes as, sadly, unusable.

Everyone - Thanks for posting your settings.

Rather than reproduce my settings here, I will just say that I am using the same settings as Adrian YO3GFH, having copied them from an earlier thread. I have also tried disabling the AGC and copying Chris Bolton's settings - it makes no difference. Audio thumps exist after (not before) every dit and dah (whether at 2 wpm or 30 wpm.)

Please can we fix this asap?

Best wishes all,

Daimon.
G4USI

Hello there :)


I built a QDX (PCB Rev 5 and firmware 1_10) for 20, 17, 15, 12, 11 and 10m (12 volts version) that works well (rx & tx) on 15m, but fails running on 10m.

The QDX is connected to a Debian Bookworm system.

For me it looks like QDX usb resets as soon as it starts transmitting.

/var/log/syslog right after booting the system:
024-03-13T07:28:21.281069+01:00 lab kernel: [ 1.404372] usb 1-4: New USB device found, idVendor=0483, idProduct=a34c, bcdDevice= 1.00
2024-03-13T07:28:21.281069+01:00 lab kernel: [ 1.404378] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
2024-03-13T07:28:21.281073+01:00 lab kernel: [ 1.404379] usb 1-4: Product: QDX Transceiver
2024-03-13T07:28:21.281073+01:00 lab kernel: [ 1.404381] usb 1-4: Manufacturer: QRP Labs
...
024-03-13T07:28:21.281238+01:00 lab kernel: [ 2.636203] cdc_acm 1-4:1.0: ttyACM0: USB ACM device
2024-03-13T07:28:21.281242+01:00 lab kernel: [ 2.636255] usbcore: registered new interface driver cdc_acm
2024-03-13T07:28:21.281242+01:00 lab kernel: [ 2.636259] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters


7:40 torsten@lab:~$ sudo ls -l /dev/ttyAC*
crw-rw---- 1 root dialout 166, 0 13. M?r 07:28 /dev/ttyACM0
07:41 torsten@lab:~$


WSJTX error-message:
Hamlib error: write_block():1077 failed -1 - Input/output error
ic10_transaction: called cmd='IF;', len=3, data=0x7ffa789f33d0, data_len=0x7ffa789f3384
rig_flush: called for serial device
read_string_generic called, rxmax=4095 direct=1, expected_len=1
read_string_generic(): read failed, direct=1 - Input/output error
tcflush
write_block():1077 failed -1 - Input/output error
ic10_transaction: called cmd='IF;', len=3, data=0x7ffa789f33d0, data_len=0x7ffa789f3384
rig_flush: called for serial device
read_string_generic called, rxmax=4095 direct=1, expected_len=1
read_string_generic(): read failed, direct=1 - Input/output error
tcflush
write_block():1077 failed -1 - Input/output error
IO error
)
1:rig_get_vfo: elapsed=1ms
1:rig.c(2991):rig_get_vfo returning(-6) IO error

IO error
IO error
while getting current VFO



/var/log/syslog after the error:
2024-03-13T07:17:23.028955+01:00 lab kernel: [41902.754569] usb usb1-port4: disabled by hub (EMI?), re-enabling...
2024-03-13T07:17:23.028974+01:00 lab kernel: [41902.754583] usb 1-4: USB disconnect, device number 2
2024-03-13T07:17:23.074877+01:00 lab kernel: [41902.804441] usb 1-4: cannot submit urb (err = -19)
2024-03-13T07:17:23.074926+01:00 lab kernel: [41902.804538] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 1 ep 5 with no TDs queued?
2024-03-13T07:17:23.074929+01:00 lab kernel: [41902.804551] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 1 ep 6 with no TDs queued?
2024-03-13T07:17:23.076888+01:00 lab kernel: [41902.804632] usb 1-4: Unable to submit urb #2: -19 at snd_usb_queue_pending_output_urbs
2024-03-13T07:17:23.076918+01:00 lab kernel: [41902.804800] usb 1-4: cannot submit urb 0, error -19: no device
2024-03-13T07:17:23.076921+01:00 lab kernel: [41902.804810] usb 1-4: cannot submit urb 0, error -19: no device
2024-03-13T07:17:23.079146+01:00 lab pulseaudio[1953]: Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: Datenübergabe unterbrochen (broken pipe)
2024-03-13T07:17:23.083795+01:00 lab pulseaudio[1953]: Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: Eingabe-/Ausgabefehler
2024-03-13T07:17:23.356935+01:00 lab kernel: [41903.082794] usb 1-4: new full-speed USB device number 4 using xhci_hcd
2024-03-13T07:17:23.504901+01:00 lab kernel: [41903.232739] usb 1-4: New USB device found, idVendor=0483, idProduct=a34c, bcdDevice= 1.00
2024-03-13T07:17:23.504930+01:00 lab kernel: [41903.232755] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
2024-03-13T07:17:23.504933+01:00 lab kernel: [41903.232761] usb 1-4: Product: QDX Transceiver
2024-03-13T07:17:23.504934+01:00 lab kernel: [41903.232765] usb 1-4: Manufacturer: QRP Labs
2024-03-13T07:17:23.508949+01:00 lab kernel: [41903.235416] cdc_acm 1-4:1.0: ttyACM1: USB ACM device
2024-03-13T07:17:23.513661+01:00 lab mtp-probe: checking bus 1, device 4: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-4"
2024-03-13T07:17:23.513836+01:00 lab mtp-probe: bus: 1, device: 4 was not an MTP device
2024-03-13T07:17:23.546437+01:00 lab systemd[1936]: Reached target sound.target - Sound Card.
2024-03-13T07:17:23.546901+01:00 lab systemd[795]: Reached target sound.target - Sound Card.
2024-03-13T07:17:23.549359+01:00 lab mtp-probe: checking bus 1, device 4: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-4"
2024-03-13T07:17:23.549495+01:00 lab mtp-probe: bus: 1, device: 4 was not an MTP device


As you can see the port changed from /dev/ttyACM0 to /dev/ttyACM1, and its not recognized correctly anymore. Also the "Soundcard"-devices aren't available anymore ... sometimes the input device "survived", but the output-device is gone each time.


Any hints what to do/test?


Cheers,
Torsten

--
vy 73 de Torsten | DO4TE

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Got my QMX on Monday March 10th. Did 2 QSO's 20m.
CQ'ing again on tuesday - no rx at all. Transmit is fine to me.

1 - board revision: Rev3 so Hans told me - got it assembled from QRP-Labs and do not open it.
2 - Bands: low, 80-20 m
3 - build supply voltage: 12 V
4 - FW version: 1_00_017
5 - modifications: none

I am slightly frustrated...
cheers - Raimund

I think the thumps are coming from the AGC and you disabled it. increasing sidetone volume to 60 also somehow helps.

Simon

I only just started to test my QMX with a paddle a few days ago.? Initially I experienced the severe sidetone clicks that have been reported with the latest and previous version of firmware.? I made a few arbitrary changes to the settings as follows and the clicks have vanished completely!?





and a sample of here's the signal being produced


73 Chris - M0KNF

Hi Greg,

I bought an unbuilt kit of the same vintage recently.
It requires a capacitor on the power input to prevent potential damage from supply spiking.
D33 cathode to 0V.
10uF tantalum or electrolytic.
Described and shown in QCX-mini assembly Rev1.05. Pages 67 - 69.

If you’re installing AGC module there are a couple of wires to be added, information in AGC manual.

73.

Hello Emory,

12, 11, and 10 meters share the same low pass filter (LPF).? This would point to a problem there.? The most common is one of the toroid connections did not burn through the enamel.? This assumes that the configuration is correct.? I suggest the following:

1 - Update to the latest firmware from the QRP-Labs web page:?


2 - Do a factory reset

If the above does not solve the issue, then:

3 - Verify that the LPF diode selection is working correctly.? This also verifies that the toroid connections are good, as the toroids are used to conduct the DC bias.? The LPF diodes are D508 through D513.? D510 and D513 select the 12/11/10 meter LPF.? The banded end (Cathode) should be close to 0 volts.? The other four should be close to the supplied voltage to the QMX.? This test is while receiving, not transmitting.

The next steps would depend on your findings from the above.? Please post your results, including the version of the firmware.

73
Evan
AC9TU

Just a note that this issue of? some of Granberg's pronouncements and inconsistencies is still being looked at.

1.? John Z's comment about? Adsl? Line drivers applies to some? Texas chips . I think the part numbers start MHD.? Anways they can be driven from 24 V and?
the indications are they would produce about? 6W rf out up to 30 Mhz.? The 30 Mhz is from the Tx industries'? datasheet.

2. Some basic work on the? phasing choke used in the Kees Talen? 16 W RF amp? (13.8 V supply) shows that the? ?BN 43-302 appears to only just work.? That's to say? it appears to be near saturation and that would cause the impedance to fall away badly.? This? would lead to power from the primary of the? OP transformer being dumped into the series impedance of the RF choke.? ? I need to do some LTspice simulation? on this aspect (but bear in mind LTS treats magnetic components as completely linear ). H? Granberg? ?(EB and AN series from Motorola) provided no discussion of? Pt choke design anywhere I can see - eg impedance requirements versus the parasitic impedance of the transformer primary it was driving or any criterion like that.?

Will report in due course.? TEF

New QMX build with no output on 12 and 10 meters?? Below measured on QRP watt meter and dummy load.
20 - 4.5 watts
17 - 4
15 - 2.5
12 - 0
11 - 0
10 - 0
Checked and re-checked, did not find any solder bridges and LPF's all seem ok?
Any help or suggestions would be greatly appreciated.? Thank you? 73? Emory? WM3M

My QMX running .017 is also very unpleasant to use on CW due to the thumps. No amount of massaging of the settings has made it any more pleasant to use. I’m hoping one day that the solution will be found but until then, it’s an FT8 rig in my shack and I’m still using my KX1, K1 and PFR3 CW rigs, all perfectly thump-free.

CW operators are careful listeners and we seek an enjoyable auditory experience.
Let’s wait and see if QMX can deliver one.?

Gang,

We have added two bare boards for use with our PTO. While I was working on designing the PTO, I used the Norcal Tin Ear circuit for the testing. I have some of these 40m receiver boards available for anyone that wants to experiment with a PTO.

We also have an option 2 to the prototype PTO project. It is a 4.25" sq. board that uses only the TinEar oscillator with 375 pads for your design and expansion. All the power and I/O connections are contained on the board.

Either bard board is available for $12 w/free conus delivery. Both options are described at:

https://qrpbuilder.com/pto-test-bed

Ken - wa4mnt

Forgot to mention - both radios built for 12 v operation. I’ve been using them at about 11.8 volts.

Jim / K7TXA
Eagle, ID

SKCC 10447T
BUG 301

Interesting discussion. To wit:

Part 1:

- Well like ALL of the responses so far, I also am affected with clicks that are there no matter what combinations of settings I use, with some settings worse than others. AND no matter what settings I may be using to make it seem better; heard signals and noise generally impinge the usefulness of any particular settings I may be using. (And no; I have NOT tried everyone else's settings in their *entirety* to compare ALL of the various ideas.....sorry I need to sleep, eat, make merry, and so forth during my days and nights....hi hi)

- i.e. Sadly, I think the problem is more fundamental than any particular combination of user settings as the solution will be found in the SDR code. Perhaps when Hans finds a fix, I will be proven wrong about my gut feelings. I hope I am. Truly.

Part 2:

*** I would ask another question; Is there ANYONE using this radio that does NOT hear clicks when running CW at 20-25 wpm and hooked to an antenna ? IF SO; I'd sure like to know what those particular settings are !

i.e. Go ahead prove me dead wrong ... please, as I want this radio to be more than an FT8 radio.


es vy 73 OMs de "baab" w9ya - QMX serial number 100 running .017 firmware. (I bought mine the 1st evening they were available.....so yeah; it's a rev1 board.)

On 12/03/2024 21:02, Lasse wrote:

and it is FT8/FT4 2-way communication shown in the pictures

Right! I was thinking WSPR. That's not bad 2-way JA.

Hi, I have an unbuilt Rev 1 QCX Mini (circa 2020) that I want to start, but I remember that there was some kind of a problem with, I believe, the power supply circuit.? Where will I find the documentation for a Rev 1 build and necessary modifications?

Thanks in advance,
73, Greg, KM5GT