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Re: QDX xmit one flash

 

Wayne,

You stated, "I built my QDX for 9VDC and am running it with a 9VDC 2Ah wall wart power supply. "? Can you confirm that it is 2 amps and not 2 amperhours?? There is a difference as amperhours is the length of time that the battery will provide current depending on the amount of current drawn.? There is also a maximum current that the supply can deliver.? The best is to measure the voltage while the QDX is running.

73
Evan
AC9TU
Re: QDX xmit one flash

 

Hi Wayne,

I do not have a Windows 11 machine configured for WSJT-X operation.? They are all Windows 10.

I used my Rev1 QDX today to see if I could find similar issues to what you are reporting.? I did see the same problem.? To resolve it, I first verified that PuTTY could talk to the QDX.? At first, it did not, as the com port changed in the last Windows update.? If the com port is not configured correctly, WSJT-X does not start the waterfall and appears to have audio issues.? To get everything working again, I had to reload the QDX firmware and restart the PC first and then the QDX.? I verified the settings in WSJT-X, and everything worked.

So the steps I recommend are:
1 - Load the latest firmware (1_10) to the QDX
2 - Power off the QDX
3 - Reboot the PC
4 - Turn on the QDX
5 - Use Device Manager to verify the com port number
6 - Use PuTTY to verify transmitter operation
7 - Exit out of PuTTY and close the PuTTY window
8 - Start WSJT-X
9 - Set any values that may have changed (Comm port)
10 - Verify receive and transmit with WSJT-X

It took me a couple of resets to get the above to work.? Something in the last Windows update messed up the comm and audio settings.

NOTE: The QDX is fussy when connecting to Windows.? The PC must be on and connected when powering on or first connecting the QDX.? It has to do with setting the USB parameters.

73
Evan
AC9TU
Re: QDX xmit one flash

 

So, one other thing I checked based on other things I looked at in the forums related to my issue, is my input voltage. I built my QDX for 9VDC and am running it with a 9VDC 2Ah wall wart power supply. I checked the unloaded voltage and it reads 9.2 volts. Might is be possible the voltage is getting too low under load?

Wayne
Re: QDX xmit one flash

 

Hey, Cliff. I'm not sure how to check that in Windows, either; although, everything I an see indicates the QDX soundcard is assigned correctly.

Wayne
Re: QDX xmit one flash

 

Hey, Alan. Maybe? Where do I find that in win11?

Wayne
Re: QDX xmit one flash

 

Roger, thanks for everything. I really do appreciate your trying.

Wayne
QMX - What are my options?

 

I have been trying to get somewhere troubleshooting why my 12v QMX will not boot or show up as a USB device. I have checked the power supply boards, which seem to be working, and have followed all the steps others in here have done to try and get theirs working, and haven't gotten anywhere.?

What can I do at this point to get somewhere with this? Is there someone around that can provide some one-on-one troubleshooting guidance??
Re: QDX xmit one flash

 

On 24/08/2023 13:22, Wayne Greene wrote:
some stupid and rediculous sound setting in my computer
Wayne

Not microphone privacy?

73 Alan G4ZFQ
Re: accurate time source

 

Dimension 4 is a reliable time sync software.



73

Barb WB2CBA
Blue screen of death U3s

 

All,
The other week my U3s stopped working, it coincided with a nearby thunderstorm. I had been tx'ing wspr and qrss at the time, noticed spots had ceased, checked U3s and just a blank blue screen, the QLG2 lights were all still blinking.
So far, replaced MCU with new one from Hans, changed screen in case this one had burnt out, listened to 27MHz crystal, checked all wiring secure. I have the OCXO fitted, this still heats up.?
I believe that the clock on the SI5351 chip on board the OCXO has stopped working, I will probe the outputs to the MCU and PA this weekend, presumably if the 5351A unit is toast then the mcu will not output any text to screen or output power. Filter relay board fitted.
There's very little that can go wrong on the U3s unlike some other kits, I did have the plain 5351A board but gave it away so unable to do a quick swap and check.
Other than the above any?thought's on other suggestions to look at.
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.
Re: QDX xmit one flash

 

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Wayne,

I'm not a Windows guy, but in Linux sometimes the QDX soundcard can get assigned to the wrong device, such as HDMI or something of the sort and it has to be corrected to get it to work with the QDX.

73,
Cliff, AE5ZA



On Aug 24, 2023, at 08:22, Wayne Greene <wayne.greene489@...> wrote:

Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:
<dummyfile.0.part>

I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.

Wayne

Re: QDX xmit one flash

 

Ok. Sorry Wayne. I am out of ideas, Windows is not my scene.

Maybe someone else can help.
Roger

Get
On 24 Aug 2023, at 09:23, Wayne Greene <wayne.greene489@...> wrote:

Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:


I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.

Wayne

Re: QDX xmit one flash

 

Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:


I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.

Wayne

Re: QRP antenna tuner?

 

I cannot recommend the ATU-100 Chinese look alike after having built one. If left in the automatic mode, it goes through a re-tuning cycle EVERY time you go into transmit mode even if you do not change the transmit frequency. As has been mentioned, there is no restriction on how bad the SWR can get during the tuning or retuning cycle. In the manual mode, you can step through the inductance values or the capacitance values. BUT if you change from one to the other, the setting of what you changed from will reset to zero. This has been my experience, but your results may vary,
Stephen, KO4CVU
Re: QMX AGC... any progress?

 

I posted a couple days ago about a super simple albeit kludged option involving some diodes to limit the voltage on the headphone cable.? Might be worth trying.
Re: QMX power on issue

Ed Pflueger-AB4IQ
 

Come on Bruce, get it right.? LOL..? I took a jumper from the RF connector shell and touched the ground connection on the power connector and it fired up.? I normally fill the holes up on the power connector but did not do it this time.? I filled up all 3 holes and all is well.
Re: QDX xmit one flash

 

Ok. So no output at the dummy load.

I would now start working backwards from the BNC socket centre pin,through the LPFs to the PA, checking for continuity. QDX turned off, ok!

I suspect you have a poorly soldered toroid.

Roger

Get
On 24 Aug 2023, at 08:13, Wayne Greene <wayne.greene489@...> wrote:

Correct, pulsing. I didn't hold it the keys down until you suggested that, lol. OK, my dummy load does have a power meter attached. It's analog and the needles do not move at all. I'm not sure about measuring the voltage across the dummy load, though. That I've never done.

Re: QDX xmit one flash

 

Correct, pulsing. I didn't hold it the keys down until you suggested that, lol. OK, my dummy load does have a power meter attached. It's analog and the needles do not move at all. I'm not sure about measuring the voltage across the dummy load, though. That I've never done.
Re: #QMX Tweeking QMX output power #qmx

 

If you review the as designed turns and inductance and compare with
measured or even calculated inductance, you'll see why L513 turns need
to be tight together or add one turn and spread them. I mod L513 on my
builds and leave the rest of the LPF inductors alone (evenly spread).
To each his own.

-mike/w1mt

On Thu, Aug 24, 2023 at 7:50?AM howard winwood G4GPF <winwoodh@...> wrote:

Why? Nobody will know the difference, you are chasing unicorns, leave it as it is and use it.

On Wed, 23 Aug 2023, 19:18 Cliff, <ae5zaham@...> wrote:

I ended up adding a turn to the L513 toroid for 20-30M. Gave me an extra watt. Squeezing the turns helps some so figured adding the turn was going the right way. It may not always work that way depending on circuit values.

73,
Cliff, AE5ZA



On Aug 23, 2023, at 13:09, Randy <wrmoore47@...> wrote:

I'm getting a little over 4 watts into a dummy load on 80m and 60m. All other bands are 3.0w-3.5w. I would like to get all bands >=4.0 watts. I've tried compressing and expanding all the low-pass filter torroids. Its difficult to get much movement out of the turns, and hardly any change in output power. For one thing, I guess I wind my torroids fairly tightly, and for another all the LPF torroids are squeezed onto the board such they all touch one or more other components and I can't get some turns moving around the contact with those components.

I probably should be happy with what I've got, but are there other tweeks I should be trying? If anyone has gotten higher output by tweeking the LPFs, let me know which ones and whether you compressed or expanded. Or if you added or removed turns.

73,
Randy, KS4L
Re: QMX and FT8CN audio issue - strange issue

 

Did anyone already find a solution for the problem with FT8CN?

Sometimes the first transmission works, often even not the first one.
The QMX just shows two Dots, as a sign of not enough signal and no tx signal at QMX.
Changing the Riese Threshold did not change the behaviour...

With WSJTx on Windows it is more reliable as long as you have the "Power Slider" on 100%, otherwise same situation with the two dots and no transmission
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