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...the Images:

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Hello,

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I am doing some experiments with the qmx filter sections. E.g. I bridged the BPF and LPF section by a cap.

I wanted to test, how flat the sweeps are without any filter.

The results are good enough for testing the correct function of the filters.

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But I noticed some strange effects, that could give a hint for the calibration issues:

Some sweeps contain very low values. When I change the borders of the sweep i get good results.
Are there are numerical unstabilities or overflows in values?

By design, the QMX also contains some birdies, maybe they could have such an influence on measurements?

You can compare these two images on similar frequency ranges:

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This is all done with the 27 firmware.
Here we didn't notice the bug, because we never played with the frequency ranges.

During calibration, or my experiments, it becomes visible.

(Just my theory)

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Vy 73 Peter DL4PJ

On Fri, Mar 28, 2025 at 11:00 AM, Chris wrote:

I tested the quality of the SSB transmission today. A standard electret microphone with a mic gain of 55 and a compressor of 3-5 and at the end. The receiver was an FT-817.

Very nice quality, Chris.? Thanks for posting!

Thank you Stan! I did as you said and now I have Terminal and my PTT is enebled!

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BR/Sergey

UB3AZK

Hector, maybe you are just noticing them more because in SSB mode your receiver bandwidth is a lot wider.

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73, Dan - W2DLC

Hi! Has anyone experienced an increase in birdies and/or decrease of rx sensitivity?

Maybe its my AGC settings but I get a lot of birdies and some of them are very annoying, maybe they were already there but it seems to me that they increased since the update.

About the birdies, I read they should get better as the firmware gets updated, but I wonder if its just my device. The sensitivity thing could be too the AGC but Im not really sure. It could also be the birdies since some of them are near the signals im tunning in. This is all comparing it to a chinese uSDX and previous QMX CW operation.

I updated to the 1.01.003 and so far everything is okay besides that. SSB tx works really great, specially the CESSB.

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73, Hector-EA4IIF

Stan,

mine has done that since 001, depending on what menu you have visited before you exit out.?

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73, Dan - W2DLC

One new quirk I found on 1_01_003:

In the terminal interface, when you exit from the Diagnostics screen, it now changes the band in the QMX VFO, rather than leaving it set to whatever it was before entering Diagnostics.

Stan KC7XE

On Wed, Mar 26, 2025 at 06:53 PM, Glenn S wrote:

If you make a parameter change in the terminal, say turn off CESSB, is the change immediate or do you have to exit terminal mode or exit the sub menu?

Most of them happen immediately.? That was the intent.

By experimentation, I have found that a couple of them still require you to exit to a higher level menu before they take effect, in this 03 version:??

- VOX, it won't operate after turned ON if you are anywhere in the Configuration menu; must exit to main menu.? So you also can't see the effect of its threshold and holdtime parameters.? (this is probably a bug)

- ok, I thought there was another, but I can't find it now.

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Stan KC7XE

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Tnx Stan, tnx Chris. That makes it clear.

73 Chris

Thank you very much Stan! Will try in the evening.

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BR/Sergey

UB3AZK

If you make a parameter change in the terminal, say turn off CESSB, is the change immediate or do you have to exit terminal mode or exit the sub menu?

Glenn VK3YY.

Open device Manager and expand the Ports (COM & LPT). You will see one or more COM ports, one of them is the QMX. You can determine which one by unplugging the USB cable and see which one disappears. Use this COM port number in the opening dialog of TeraTerm serial connection.

Gary

W9TD

Sure thing.? TeraTerm Setup (this looks long, since I tried to be thorough, but it is simple):

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Step 0) In order to setup any terminal program, you first need to make the QMX COM port active on your computer.? To do this, first connect a USB data cable between your QMX and your computer.? Then, after it is connected, turn on your QMX (or power-cycle it if it was already on).? This should cause your pc to recognize the new COM port device.? It will have a number, like COM8: or COM10: (which you will hopefully be able to see in step 3 below). ?

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Step 1) actually a 'not' step: Don't connect any other program connected to your QMX, like WSJT-X, fldigi, or an SDR program or whatever - only one program can use the serial port at a time.

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Step 2) Open TeraTerm.? By default it has a very small screen, so I set it up with a larger font size so I can see it easier.? So (optionally) first select "Font" from the "Setup" menu,? and choose "Consolas" font at size 18 (or to your preference).??

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Step 3) Select "Serial Port" from the "Setup" menu.? In the dialog that pops up, there is a 'Port:' item with a drop-down selection box.? This has all of the numbered COM ports that are currently available on your computer.? Click on each numbered COM port in the drop-down box, and the information about that COM port will be displayed below.? The correct COM port for QMX will be the one that says "USB Serial Device" as the "Device Friendly Name".?? Select that port and note the number.? On mine it is COM10.? In that same screen, make sure 'Flow control' is set to 'none'.? The other parameters don't matter.? Then click 'New Open' to close the dialog and open that port.

Note 1: If you have more than one port with that same label, let me know and we'll add some steps on resolving which one to use.?

Note 2: If you don't see a COM port with that label, close the serial port setup box, power-cycle your QMX, and open the serial port setup box again to see if it appears.? Also see the note below about USB cables.

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Step 4) The screen will be empty.? Hit Enter.? The QMX 'Main menu' should appear, like magic :)? Learn all about how to use the various menu items in the QMX operations manual.? Most of them are quite obvious.? [A note about the Band Configuration menu you are looking for is just below].

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Step 5) Select the 'Keyboard' item from the TeraTerm 'Setup' menu.? Click the checkbox by 'Backspace key', and select OK.? This makes editing the numerical and text fields in the QMX menus work as expected using the backspace key.

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Step 6) In order to make this configuration come up each time you start up TeraTerm, choose "Save setup" from the TeraTerm "Setup" menu, and click 'Save'.? Leave the filename as-is so it will be the default.? Next time you want to connect, just open TeraTerm, and it will try to open the the same COM port with the same settings.? Then you just hit 'enter' in the empty window to bring up the QMX menu.

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Note: Use the same physical USB port on your computer each time you connect.? This is because Win10 will assign a different COM port number to different USB ports.? If you need to change USB ports, you need to update the COM port setting again.

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Band Configuration note:? The 'Band configuration' you are looking for appears as the first entry under 'Hardware tests'.? You need to enable your TX PTT and RX PTT settings for each band.? Change 'Disabled' to 'Enabled' by pressing 'E' on the keyboard (or 'D' to change it back to disabled).

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A note about USB cables: you must use a USB 'data' cable.? Some USB cables sold for charging don't have all the wires, and can only used for charging.? If you have a cable that hooks to your phone or another device and allows you to see data or files or play music or the like - that is a data cable.??? Less common cable connection issues:? A USB-A to USB-C cable is best, since some people have had difficulty in setting up with a USB-C to USB-C cable.? And on some computers there are problems with the newer high-speed (SS) USB ports; if you have problems, try a lower-speed port, or connect through a USB hub.

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I hope that helps - let me know if you have further questions or troubles connecting.

Stan KC7XE

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I've attached QMX to the PC and I see that it is on Port#003 Hub#004

Hello Stan! Thank you for your help. I've installed TeraTrm on my PC (Win 10). What should I do to let it find QMX? I never worked with Terminal programs before (

On Wed, Mar 26, 2025 at 10:13 AM, Chris wrote:

That seems to be it.

Chris, G5CTH