Re: QMX+ with WA3TFS amplifier
On Tue, Apr 22, 2025 at 09:17 PM, James C. Hall, MD WB4YDL wrote:
But what if I decide to use say, a FT-818 that might use RF detection
Keep in mind that ANY RF detection T/R switching scheme is going to unavoidably hot-switch the transmitter while it is putting out power.
Best to use wired switching if possible.? The '818 has a TX closure to ground available at the ACC connector.
73, Don N2VGU
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Re: #qmx SSB Firmware beta 1_01_004 release
#qmx
Hi,
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The driver support for Windows 7,? and Windows 10 and 11, is different.?
Check the internet for work arounds or perhaps YouTube.?
There were drivers available for my Windows 7, but I never got them working properly.
Upgrading to Windows 11 with a purchase of a small Mini PC will save a lot of aggravation.?
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George
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Re: QMX+ no power output, low SMPS bias current
I think the LPF scans look good overall.? Here are a few examples:  ?
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Those are for the 3 least powerful bands, and they generally look pretty good to me.
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Re: Help with partially fried QMX
I ended up sending my rig over to Jeff W1NC. He was extremely helpful and get my rig sorted out. I highly recommend anyone plagued with issues after assembly make use of his service if you're looking for help. Here's what he had to say about my situation:
Both SMPS boards had peaks of solder that would cause short circuits below - reflowed all connector joints
I was not quite able to detect these issues with my skill set / tools at home. I think the problematic area was the bottom of the connectors facing the main PCB. Thank you all again for your input and assistance in this thread. Excited to get on the air and take the QMX for a spin. 73! K4HYD
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Question: Does the power icon go on and off when you are sending CW?
Hi all,?
Just got a fresh QMX+ assembled and finally got it on the air.?
After a couple days of fussing I finally got FT8 working on WSJT+. Im small tuner from my ft817 which is manual to tune.?
All good and the power icon shows full power as FT8 does its thing.?
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On CW the decoder works and the keyer sometimes goes to sleep (wont work) when sending. A power on/off brings it back.?
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My question is when sending CW should the power icon be 'pulsing' when it transmits a character??
The sidetone is working but I cant tell if it Is transmitting.?
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Any help?
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Charlie C. ?- K2CMC
LICW/SKCC/NAQCC?
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Re: QMX+ with WA3TFS amplifier
QMX and WA3TFS amplifier are working quite well together.? Earlier this evening I made 3 contacts on 20M SSB hunting POTA activators in FL, CO, MN from East TX with 57, 55 and 59 reports.
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73,
Jim - AE5JE
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Re: #qmx SSB Firmware beta 1_01_004 release
#qmx
Hi Hans
Just a minor point.? I have found when having 2 com ports open at the same time i.e. Putty and WSJT-X, the 'microphone test' in Putty doesn't work - there may be a couple of bars but it stops at that point.? However on closing one of the ports, the 'microphone test' functions properly.
Cheers
Greg, ZL4GW
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Re: #qmx SSB Firmware beta 1_01_004 release
#qmx
Hi Ludwig
Re your problem with WSJT-X.? I experienced the same problem BUT it was with ver 003.? The 'error in sound input' seemed to arise with no input from me - it just happened occasionally.? However I did find that the latest Hamlib update seemed to cause this error so I rolled back to the earlier version and now have no problem even with QMX+ ver 004.? This may help with your problem.
Regards
Greg, ZL4GW
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Re: qmx SSB Firmware beta 1_01_004 release + WSJT-X
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On Thu, Apr 24, 2025 at 12:01 AM, Stan Dye wrote:
So there probably isn't a problem with this part of the circuit.
Stan, maybe, maybe not. You are right, it's better to check this place.
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73 Ludwig
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Re: CW Practice / Rag Chew
Martin, Thanks for the note. Maybe next time the conditions will be better and we will be able to have a QSO. Ed
toggle quoted message
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heard nr Hamburg 439 just over my local noise floor on the QMX
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73's
Martin
DK3UW
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qmx SSB Firmware beta 1_01_004 release + WSJT-X
Hello ...
After installing 004, successfully, I've got 3 new com ports, 3, 9, & 10.
All of them allow CAT control of the WSJT software.
Decodes are happening and I have made a number of US and DX contacts today.
But, and there almost always is one, after about 8-10 minutes, the new com ports "go away" and WSJT stops working and wants connections repaired.
Shutting off the QMX+ and turning it back on restores the ports, for another 8-10 minutes.
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Anybody else seen this behavior after updating to 004ssb?
The radio plays nicely with WSJT for hours at a time with 003ssb.
Thanks,
Dick, K5AND
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Re: QMX+ with WA3TFS amplifier
Another excellent idea, Jim. If I can¡¯t find those special TRS jacks, I¡¯ll do exactly that !
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Thanks much !
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73, Jamie
WB4YDL
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Thank you for the description, Ludwig, I now understand how the controller input may be limiting this voltage.? For some reason I wasn't thinking about it correctly.
So there probably isn't a problem with this part of the circuit.
Stan KC7XE
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Stan, sorry my text was a bit short.
VDD for the controller was round 3.0V. With the higher 3.3V at ADC_3V3 the difference from ADC_3V3 to VDD is 0.3V, maybe limited by an internal protection diode. And by the current via this protection the voltage was pulled to 3.3V, around 7.3V across R112.
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73 Ludwig
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Yes, Ludwig, I forgot about the possible effect of the A/D input.
the voltage difference 3.3V - 3.0V = 0.3V looks like from a protection
But the measurement he stated at Q111 was 10.6V and 3.3V on ADC_3V3, so the difference would be?
5.3V - 3.3V = 2.0V, which I don't think would happen from the A/D input.??
Or maybe I misunderstood his measurements.
Stan KC7XE
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Release 1_01_004 bugs that did not get addressed
Two issues that I have reported before are not fixed in 1_01_004 and that is OK. I just wanted to make note that I had tested them and the bugs, as expected, are still there:
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1. With VFO B selected, SWR sweeps do not sweep.
2. Attempting FT8 with USB mode results in only one transmit cycle. After the first transmit cycle, subsequent transmit cycles produce no power. This has been confirmed by at least one other user.
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Tony
AD0VC
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Re: #qmx SSB Firmware beta 1_01_004 release
#qmx
QMXs
Low Band
80m 600
60m-20m 2500
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Medium Band
60m-15m 2500
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High Band
20m -12m 2200
11m 600
10m 2400
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QMX+ (retest after factory reset)
Almost identical to earlier post
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Re: QMX build troubleshooting
It can¡¯t have failed open circuit as the 12v rail was being shorted to ground. You can check that it is working by looking at TX voltage on the diagnostic screen. It should show 0V in RX and slightly less than Vin on TX.
Always a good plan to stop when you are tired, it¡¯s easy to make a mistake and undo all the good work. Hopefully that was the only issue. Glad to have been of assistance.?
73 Nick G0OQK
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Hello Allan & Hans
Thank you for taking the time to reply. I can see from the group messages that you have a few other irons in the fire!
My interest in the QDX-M is in building a few for our radio group to allow (encourage) experimentation with the FSQ protocol and NVIS propagation. The QDX-M makes an ideal, cheap, dedicated radio, which together with a laptop computer make an ideal field station.
I understand that some experimentation might be necessary to set up the band/low pass filters and I have some equipment here to do that sort of thing. My understanding of band selection is that it is done in firmware after getting the radio going.
So my crunch point is: Can I order a QDX-M with two sets of toroids, caps, and wire etc to proceed with the build? I can source them locally but it would be neater to get one box with all the bits. We're well out in the "bush" and everything happens by on-line order anyway.
Thanks again and I hope all is progressing well with the SSB project.
Best regards
Richard VK2EIK
QF69al
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Donald S Brant Jr
AE5JE - Jim
Richard Dyer
Dick Hanson