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Re: Severe QMX+ audio distortion

 

When you do, remember to set the mode to digital, not cw.

73
Roger
8P6RX

Get
On 23 Dec 2024, at 11:43, "G0TXL via " <pelliott.co.uk@groups.io target=_blank>[email protected]> wrote:

On Mon, Dec 23, 2024 at 03:37 AM, N4REE - Bob wrote:
It seems to me that "severe" and "awful" are extreme adjectives that deserve comparison.? "Awful" compared to what?? For example, Thomas Witherspoon often praises the audio quality of the Penntek TR-45 Lite. In comparison, I find my QMX (same audio circuits as QMX+) to sound better than my TR-45, and less tiring to operate.? To what field-portable QRP rig are you comparing the QMX+ ?? (Anans and Flexes are probably not fair comparisons.)
--
72 de N4REE, Bob Easton - QRP CW forever
I didn't realise the QMX+ would demodulate ssb, I thought with the great narrow filters it was optimised for cw.?
I must give it a try when I get back to my rig.
?
Paul
?
--
G0TXL (Paul)
Re: QMX+ with Macbook Air (Sonoma OS)

 

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Thanks to all who have chimed in on this thread.? A special thanks to Pierre, VE3HQZ for the detailed description of his process.? I am now armed with the knowledge I need to proceed with the QMX+/Mac integration.? My hat is off to this amazing group of helpful hams.

Merry Christmas! For those who celebrate, may your holiday be filled with the joy and peace that Christmas brings.? And to all, may this season be a time of warmth and togetherness.

Joe K8FC
Re: QMX and power bank PD

 

Gust, I didn't mean to put you off from trying PD power banks. They do work quite well. I and others on this forum are using them successfully. All solutions have quirks. You just need to be aware of them. The advantage of a power bank is that you can also use them to power other equipment with different voltages and connection types. It's a versatile and flexible solution.
--
73, Dan - W2DLC
Re: Qmx+ 3D printed case

 

On Mon, Dec 23, 2024 at 06:41 AM, David Wilcox K8WPE wrote:
You might want to cover the inside of the case with copper foil if you find you have problems. ?The metal factory case is metal for a reason.
Good results have been reported using copper spray paints like these: ?
The nickel might be cheaper, the silver might work better.??
Folks are using them to metallize 3D-printed waveguide components, shielding an HF radio enclosure should be easy.
Don't forget ventilation holes, plastic doesn't conduct heat like aluminum.
?
73, Don N2VGU
Re: QMX+ with Macbook Air (Sonoma OS)

 

Merry Christmas Joe!
N1MM+ works quite well on the newer M processor Macs by using Parallels and installing Windows 11 Pro ARM in a virtual machine.? USB drivers are different for Windows ARM vs Intel based so if the built-in drivers don't work, an ARM version must be installed.? They are readily available.? The downside to this is cost of annual subscription to Parallels ($99) and purchasing a license key for Windows.? The latter can be obtained generally for less than $30.? If you decide to go this route, there are complete details posted on the N1MMLOGGERPLUS groups.io.??
?
As Pierre, VE3HZQ said, SkookumLogger is a close N1MM+ Mac equivalent that works quite well.? I personally like what to me is a cleaner, easier on the eyes screen.? SL has one of the best, if not the best, CW contest practice emulators around.
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Question to you, Pierre as you said it is not able to control the QMX+.? I looked in my SL and see the Kenwood TS-480 can be selected as the radio which is supposed to work.? Is that what you are selecting?
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Merry Christmas to all!
Ron, WU4G
Re: QMX and power bank PD

 

Thank you gentlemen, knowing this I decided to not bother with a power bank PD solution.
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73 es dx
Re: QMX and power bank PD

 

I will add to what Dave has written that I don't recommend the PD triggers with the voltage and amperage indicators built in. The generate a small , but regular RF beep noise un the radio every time they change read modes. Instead, get one of those small panel ammeter/voltmeters and mount it in a mint tin to carry with your kit.
--
73, Dan - W2DLC
Re: QMX Oscillating SWR

 

Thanks for the confirmation Steve.
Re: Severe QMX+ audio distortion

 

On Mon, Dec 23, 2024 at 03:37 AM, N4REE - Bob wrote:
It seems to me that "severe" and "awful" are extreme adjectives that deserve comparison.? "Awful" compared to what?? For example, Thomas Witherspoon often praises the audio quality of the Penntek TR-45 Lite. In comparison, I find my QMX (same audio circuits as QMX+) to sound better than my TR-45, and less tiring to operate.? To what field-portable QRP rig are you comparing the QMX+ ?? (Anans and Flexes are probably not fair comparisons.)
--
72 de N4REE, Bob Easton - QRP CW forever
I didn't realise the QMX+ would demodulate ssb, I thought with the great narrow filters it was optimised for cw.?
I must give it a try when I get back to my rig.
?
Paul
?
--
G0TXL (Paul)
Re: Qmx+ 3D printed case

 

Hi Dave, I am curious what type of RFI you experienced, I have not experienced any with my 3d printed top.

Re: New QMX build questions!

 

Nice work, Chris! Those NanoVNA traces are excellent, as is your 3D print case.?
--
73, Dan? NM3A
Re: Power Source for 50 Watt Amp for QCX Series

 

On amazon I went with a linear power supply.
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It has adjustable current limit that trips if something goes wrong.
?
I think you need a supply that can put out something approaching 5 amps @20vdc
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?
I have seen the readout show over 4.5 amps on transmit.
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KORAD KD3005D - Precision Variable Adjustable 30V, 5A DC Linear Power Supply Digital Regulated Lab Grade…
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Re: QMX and power bank PD

 

Hi,
A few features/quirks that I have noticed with several different PD compatible power banks.
? ? ?All power banks will automatically turn off after a time out period if the load is below a certain level. This is to prevent the battery draining when the power bank it not in use.
? ? ?On one of the PD power banks, it does not instantly negotiate to the trigger setting for its USB-C PD port when using the ON/OFF button on the power bank.
? ? ?On a different PD power bank, if set to 12V, it tends to shut off and restart if there is a high in-rush current when the target load it turned on.

The QMX should not present a high in-rush current, so I would not expect any issues with the power bank being at the trigger voltage before turning on the QMX.

Whilst USB PD and QC provides a handy solution for powering the QMX and other devices, its primary use case is for a charging technology, and the points noted above are not generally a problem.

73, Dave
Re: QMX Oscillating SWR

 

Chris,
Thank you for this post.? My QMX had the "dancing" SWR issue. A Factory reset calmed it. Where the SWR was varying 1+, it is now varying? 0.01.
Re: QMX+ with Macbook Air (Sonoma OS)

 

Hi Joe,
?
I use my MacBook Pro with Sonoma to connect to my QRPLabs Radios.
The radios just connect with a USB cable and there is no need for Macports or any other software.
See below for my macOS use of the Terminal program for making sure you can see / connect to the radio.
?
The N1MM+ equivalent for macOS is SkookumLogger (). It connects to the QMX and gets the frequency and mode but doesn't control it. It's an amazing program that has templates for all the contests and can also connect to antenna rotors, keyers, etc.
?
I also have other logging software: SKCC Logger and NAQCC Logger.
?
My main logging software is MacLoggerDX. Also connects to the radio and antenna rotor (if I had one!).
?
For RTTY I use flrig and fldigi. Logging goes to MacLoggerDX.
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For WSJT-X I use WSJT-X for macOS along with JT-Bridge and GridTracker. This all work together nicely with autologging to MacLoggerDX.
?
These are my notes on using the Terminal program:
?
Select from Shell menu:
New Window/Pro
To enable Control-S and Control-Q?
(you need Control-Q to exit menus):
stty -ixon -ixoff
To show connected ports:
ls /dev/cu.* OR
ls /dev/cu.usb*
To connect:
screen /dev/cu.usbmodem1101
Then press enter to get Diagnostics menu.
And away you go. Works great.
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Happy to help if you have any issues...
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Cheers!
?
Pierre
VE3HQZ
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QMX Oscillating SWR

 

While working on another problem I had a strange issue with bad QRM coming through the radio.? I tried a number of things, swapping around coax, adjusting location of things, but couldn't supress it.? Then I noticed that my SWR was oscillating between 1 & 2....; running an SWR sweep confirmed the strange behaviour.? A power off/on didn't sort it, and switching band didn't seem to make much difference.
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Eventually, on a whim, I did a factory reset..... and it was gone!? Has anyone seen this behavior?? A software gremlin?? Or a hardware issue with my build?

Later, I noticed that doing an audio filter sweep leaves the radio making a lot more noise, which a power-off will sort.
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I'm hoping these are just firmware/bugs!? In operation the radio seems to be operating perfectly....
Re: New QMX build questions!

 

Hi folks, I've enclosed a few photos of my fix for the SWR/EFHW problem.
The images show the choke I wired up (with -30dB suppression on the NanoVNA), and a little box I made to hold it all together.? When attached to the EFHW after a couple meters of coax, to form a counterpoise, it seems to work great, and I can successfully run all the tests.?
This was my first time using Fusion 360 to design a box; part of the reason I bought the 3D printer.
Anyway folks, that sorted one problem out!!? Thanks for the help...
Re: New QMX build questions!

 

Re: mission impossible? QRP labs QMX power supply boards

 

Hans,
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Thanks for the response.
These PCM1804 failures are puzzling.
?
Jerry, KE7ER
Re: RF output power on 160 and 80 meters

 

It's normal to get slightly higher output power on the lower bands, for the same input voltage.?
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72/73 de Enzo M0KTZ
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