Re: The USB connection is not working.
Dear Stan,
Thank you for your interest, I have already tried what you wrote before, but I checked it again in order and the result is the same, no new ports (COM & LPT) appear in the "device manager" screen, there is also no new device as an audio driver, so in short, it's like the USB connection never happened.
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TA2KTK - Tayfun
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Re: QMX and QDX - Not enough 5V PTT oomph
Greg, a better solution would be to add a FET switch to turn on your relay - the gate of a FET is what the output of QMX was designed for, not to directly drive a relay.
A simple FET switch and a 470nF capacitor across the relay terminals, with a 9V transistor battery (or 5V arduino power source) would work well to switch your relay.
Stan KC7XE
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Re: The USB connection is not working.
Tayfun,
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Often Windows will not make a sound at all when you plug in the QMX+ correctly, because it uses the same USB virtual serial port we use on other devices, and it already has the driver installed and ready.
Follow this procedure, starting with your QMX+ not plugged in to the computer:
1) In Windows 11, bring up "Device Manager" (right-click on the windows start icon, and there is a selection for it).? In Device Manager, if there is a selection for "Ports (COM & LPT)", expand it and see what devices are present.? If there is no such selection, it's ok, you don't have any currently active.
2) Now with QMX+ power off, plug in the USB data cable to QMX+ and PC.
3) Now power on the QMX+ while watching the Device Manager window.
A new device should appear within a few seconds under "Ports (COM & LPT)", and if that ports selection wasn't there before, it should appear with one entry.
This new entry is your QMX+ - note the com port number it is using so you can use it with PuTTY or TeraTerm or whatever terminal emulator you will use.
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A key here is that QMX+ only initializes its USB port when it powers on, and only IF it sees that the cable is plugged in.? So you need to power it on, or power-cycle it AFTER you plug in the cable in order for the computer to recognize it.
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I hope this helps.? There is not a lot that can go wrong in the QMX+ hardware, since there isn't much, as you have seen.? Just a couple of wires and resistors, leading into processor pins.? So usually it is something related to the connection or startup procedure.? Win11 has all the necessary drivers pre-installed, so it should be ready to go unless you have done some specific driver unloading.
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Stan KC7XE
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QMX and QDX - Not enough 5V PTT oomph
Good evening from chilly Southwest Florida
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I've run into an issue with a relay I wired into an adjustable attenuator board.
The PTT signals coming from both my QMX HB Rev2 and my QDX LB rev 5 aren't sufficient to keep the relay pulled.
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Completely my bad.
I tested my chosen relays on a breadboard and used 5V from an Arduino Uno to confirm I had the correct pinouts and where to tie into the attenuator board (QRPKits - 41dB selectable). Nice solid pull-ins and signals attenuated when expected.
I didn't test with the actual PTT Voltage and current available from the Q's until I had everything tied in.
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I vaguely remember see somewhere that it may be possible to make more +5v current available on these units.?
Hoping someone can confirm that and give me an idea where the find messages/information. And what pitfalls I might run into if there are mods for use with QPR 50W amps that I have.?
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The relay is an HK 19F-DC5V-SHG.? It needs about 0.2W to feed the approximately 125 Ohm coil.?
On the Q's there is no solid, clearly audible relay click-in with PTT but there is faint click when dropping PTT.
I see about 1.8V across the coil when PTT is asserted.
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Thanks in advance,
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GREG KI4NVX
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Re: Soldering Station Recommendations
Hello Greg:? based on your experience with it and reviews I've read on Amazon, I'm going to order the WEP 882D.? Just $60.00 -- amazing, for so much flexibility!? The fact that you built so many QRP Labs kits with this station says a lot.??
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Chip Quick makes an array of paste products.? Can you provide an exact recommendation?
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I plan on ordering these other items:
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Solder: ?
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Helping Hands/Soldering Mat: ?
(I have doubts about its ESD suppression abilities when boards are being held off of the surface.)
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Smoke extractor: ?
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Any additional comments from anyone are welcome before I pull the trigger on this order!
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Thank you!? --73
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The USB connection is not working.
Hello, I just built a QMX+, the controls on the device work, but I couldn't test it fully because I don't have an HF antenna in my workshop. When I wanted to test it by connecting it to my computer, I found that the USB connection doesn't work, when I plug in the cable my computer doesn't react at all, there is no warning like "device unknown", it's as if the cable was never plugged in. Then I started searching the group posts and double-checked the items I wrote below,
- I am sure that the cable I am using is suitable for data transmission
- It was written that the smd mount USB-c connector sometimes has soldering errors, I made sure it was soldered correctly,
- I have checked the 2 lines coming out of the USB-c connector and going to the microcontroller and they look healthy,
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I am using windows 11 operating system, I don't have access to an older version of windows or linux distro for now but I will try them.
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Many thanks in advance for your help on the subject.
TA2KTK - Tayfun
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Re: Initializing:Enable SI5351A
Mine did that recently too. Just shutdown everything and reconnected PD bank and trigger cable, USB cable, dummy load etc.
Have no idea why. Just did it once.
On Tue, Jan 7, 2025 at 4:37 PM, Alan G4ZFQ via groups.io <alan4alan@...> wrote: On 07/01/2025 19:24, Halil via groups.io wrote:
> When the device is turned on, it shuts down after this error message.
> What could be the reason for this error?
What device?
The message seems to indicate a problem with, or around, the SI5351
73 Alan G4ZFQ
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Re: QMX+ with ~1000 tone on 12M & 6M
I have tried the dummy load with no change in symptoms.
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Mike, your FT8 plot at least gave me a hint of how to 'see' the tone, HIHI.? I had to install WSJT-X on my little Raspberry and set it up ( piece of cake ) and now I can see mine, and it looks a great deal like yours.? Only on two bands HIHI.? Actually with the high end test using WSJT-X software, I can detect a tone on 10M as well.? But it's way down in the noise.? I may do some quick soldering around the filter parts, etc.? but the traces all look good on the bands in question so a bit of heat might rule out a bad connection.
I think the 1408 is the issue.? I am going to order a small quantity to see if I can change it myself.? On this radio it's pretty much out in the open, so should not be an impossibility.? There have been several notes on the soldering process to change out the 1408 so I am going to give it a try.?
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I will report back when i find the issue.? It may take a while as I have to get components here, then find time to concentrate on the fix for a bit.? I am *very* slow on stuff like this.? It took me 7 months to build the QMX+ HIHI.
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73
Dick
W4PID
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Re: Initializing:Enable SI5351A
From the pic, it appears to be a QMX+.
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- Bruce K1FFX
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Re: Initializing:Enable SI5351A
I've seem this once and am also puzzled.? However I have noticed that my QMX is susceptible to ESD and if it gets zapped it does weird things.? (when my clothes clash ESDwise with the material in my office chair :-).
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Brien - KE7WB
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Re: Initializing:Enable SI5351A
On 07/01/2025 19:24, Halil via groups.io wrote: When the device is turned on, it shuts down after this error message. What could be the reason for this error? What device? The message seems to indicate a problem with, or around, the SI5351 73 Alan G4ZFQ
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Hanz, I don¡¯t have a QMX+ V1, but I¡¯m not convinced that you have interpreted the pinout of JP104 correctly. ?I think pin 6 should be ground, not pin 2, using the numbers you have added in the photo. You can always check for ground with your multimeter in continuity mode, to the outer of your BNC connector.?
If you look at page 65 of your assembly manual there are instructions to force Bootloader mode by grounding aux 2. If successful this will make your QMX appear as a flash drive.?
Also on the board layout on page 65 you should see JP105 right next to JP104. ?JP105 has the pins identified and is a good place to measure your supply rails, though the 5V will not be present in Bootloader mode.
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Re: May the Morse Be With You
My favourite is?
?(short for learn cw online)
It is web based, has got a wide variety of options to practice acc. your choice, it is translated into 30 something languages and most importantly it is FREE!
73! de Bekir TA2RX 7 Oca 2025 Sal 20:08 tarihinde Jim VE4BWG via <willijt= [email protected]> ?unu yazd?:
Hello.
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I am returning to ham radio after more than 40 years away. In order to regain some proficiency in CW I have purchased the device referenced in this URL. I am very pleased with it and it is a great assist for me. Plus it's fun. I offer this purely as an informational pointer. To clarify - I have no interest whatsoever in the marketing of this or other ham radio related devices.
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--
73
Jim
VE4BWG
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Initializing:Enable SI5351A
When the device is turned on, it shuts down after this error message. What could be the reason for this error?
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Well rats.
Honestly I'm out of ideas.
I can't imagine why the Mac thought the Q was consuming too much power, as the USB on the QMX only uses the two data lines. No traces from the USB to anything else to my knowledge.
Any chance you tried the set-to-bootloader with the temporary jumper steps?
On Tue, Jan 7, 2025 at 11:33 AM, hanz YL3JD via groups.io <yl3jd@...> wrote: Is there a possibility that the bootloader is damaged?
The first few times i have seen the qmx drive come up but it was closed by the MAC due too much power.
At one time i tried to copy the new firmware but on that moment the mac closed again the USB port.
After that i see never the qmx drive again.
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hanz
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Re: Fldigi RTTY dropping PTT with QMX and QMX+
Excellent!
Tuning off Shapped tx did it!
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Stan, thank you so much for your help.
Best 73, Bob
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Sorry Nick i forgot to mention the plus.
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Re: Fldigi RTTY dropping PTT with QMX and QMX+
1. Make sure that TxID is turned off.? Its timing is incompatible with QMX current tone detection, and QMX will drop tx in the pause between the TxID and normal modem signal (happens in many fldigi modes, not just RTTY) - probably a QMX firmware bug, it is on Hans list to fix.
2. In fldigi "Config - Modem - TTY - Tx" turn off "Shaped Tx".? This conflicts with QMX's own shaping algorithm, and causes it to drop transmit.
I hope that helps...
Stan KC7XE
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Fldigi RTTY dropping PTT with QMX and QMX+
I¡¯m trying to use Fldigi RTTY and seeing the PTT dropping at the very beginning of transmitting text.
watching QMX output on my scope I see initial RF signal for less than a second and then output drops.?
I have configured Fldigi to use Hamlib with settings of PTT via hamlib command and RTTY is USB mode.
If I click on tune in Fldigi upper right corner, it enables PTT for duration that I keep it set.
I am sure this is a configuration issue but I don¡¯t know what it is. Any ideas?
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Thanks for any suggestions.
Bob, K3TCT
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Re: Computer not connecting to newly built QDX
Even plugged in the QDX, waited until LED stopped flashing, plugged USB cable into computer and got "unknown device."
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Yes, I did the v3a cut on the pc board. Not doing it I think would result in smoke and flames..har, har!
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73
Karl
KI4ZUQ
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Richard Hattaway
Brien - KE7WB
hanz YL3JD
Karl